Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression

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The lordosis reflex in female rats is a well-studied model requiring hypothalamic circuits, ovarian hormones, and somatosensory input, yet these findings have been framed qualitatively without a formal law specifying how the factors combine. Methods I propose a candidate law of convergence, formalized by the ARCH × Φ framework, in which behavior is modeled as a multiplicative product of Archetype (A: neural substrate), Drive (D: hormonal priming), Context (C: tactile stimulation), and a modulatory threshold field (Φ: arousal, neuromodulation, stress). Drawing on decades of lesion, hormone, and tactile manipulation studies, I evaluate three necessity tests of lordosis: loss of the ventromedial hypothalamus (A), ovariectomy without estradiol–progesterone replacement (D), and removal of flank stimulation (C). Results Across these tests, lordosis fails when any single factor is absent, even when the others are intact. This supports conjunctive necessity rather than additive sufficiency. Incorporating Φ explains modulatory influences such as dopamine, serotonin, stress, and development, which shift the threshold for expression. Conclusions This synthesis reframes lordosis as a model system for testing a general principle of conjunctive behavioral control. The proposed law of convergence generates falsifiable predictions, integrates disparate findings across neuroendocrinology and ethology, and may extend to other motivated behaviors, including aggression, caregiving, and social bonding. By moving from description to quantitative formulation, the ARCH × Φ framework advances toward a predictive field theory of behavior. 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F1000Research 2025, 14 :939 ( https://doi.org/10.12688/f1000research.169980.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Research Article Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] Tahir Rahman https://orcid.org/0000-0002-7787-1678 Tahir Rahman https://orcid.org/0000-0002-7787-1678 PUBLISHED 18 Sep 2025 Author details Author details Psychiatry, Washington University in St Louis, St. Louis, Missouri, 63110, USA Tahir Rahman Roles: Conceptualization, Writing – Original Draft Preparation OPEN PEER REVIEW DETAILS REVIEWER STATUS Abstract Background Behavioral expression rarely depends on a single determinant; it emerges from the convergence of neural, hormonal, and contextual factors. The lordosis reflex in female rats is a well-studied model requiring hypothalamic circuits, ovarian hormones, and somatosensory input, yet these findings have been framed qualitatively without a formal law specifying how the factors combine. Methods I propose a candidate law of convergence, formalized by the ARCH × Φ framework, in which behavior is modeled as a multiplicative product of Archetype (A: neural substrate), Drive (D: hormonal priming), Context (C: tactile stimulation), and a modulatory threshold field (Φ: arousal, neuromodulation, stress). Drawing on decades of lesion, hormone, and tactile manipulation studies, I evaluate three necessity tests of lordosis: loss of the ventromedial hypothalamus (A), ovariectomy without estradiol–progesterone replacement (D), and removal of flank stimulation (C). Results Across these tests, lordosis fails when any single factor is absent, even when the others are intact. This supports conjunctive necessity rather than additive sufficiency. Incorporating Φ explains modulatory influences such as dopamine, serotonin, stress, and development, which shift the threshold for expression. Conclusions This synthesis reframes lordosis as a model system for testing a general principle of conjunctive behavioral control. The proposed law of convergence generates falsifiable predictions, integrates disparate findings across neuroendocrinology and ethology, and may extend to other motivated behaviors, including aggression, caregiving, and social bonding. By moving from description to quantitative formulation, the ARCH × Φ framework advances toward a predictive field theory of behavior. READ ALL READ LESS Keywords lordosis reflex, female rat behavior, neuroendocrinology, ventromedial hypothalamus, periaqueductal gray, estradiol, progesterone, sexual receptivity, behavioral neuroscience, multiplicative model, convergence law, ARCH × Φ framework, arousal, dopamine, serotonin, stress, maternal caregiving, predator defense, motivated behaviors Corresponding Author(s) Tahir Rahman ( [email protected] ) Close Corresponding author: Tahir Rahman Competing interests: No competing interests were disclosed. Grant information: The author(s) declared that no grants were involved in supporting this work. Copyright: © 2025 Rahman T. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. How to cite: Rahman T. Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.12688/f1000research.169980.1 ) First published: 18 Sep 2025, 14 :939 ( https://doi.org/10.12688/f1000research.169980.1 ) Latest published: 02 Feb 2026, 14 :939 ( https://doi.org/10.12688/f1000research.169980.2 )  There is a newer version of this article available. Suppress this message for one day. 1.1 Historical background Behavioral science has long sought formal laws to explain the emergence of behavior. Lewin (1936) introduced the field equation B = f(P, E), positing that behavior (B) arises from dynamic interactions between personal factors (P) and environmental influences (E). His formulation, modeled after Einstein’s field theories, underscored that neither internal nor external determinants alone suffice; instead, behavior emerges from their convergence. 1 Tinbergen (1963) later articulated a framework that incorporates proximate mechanisms, ontogeny, function, and phylogeny, emphasizing that even reflexive responses are shaped by multiple, hierarchical constraints across biological systems. 2 Although behavioral scientists have long recognized that multiple influences shape behavior, such convergence has usually been described only in qualitative terms. What has been missing is a formal analysis of convergence: the explicit claim that no single factor is sufficient, and that behavior emerges only when neural substrates, hormonal drive, and contextual inputs align above a functional threshold. Importantly, this formulation is not additive—where partial contributions from two strong factors might substitute for the absence of a third—but multiplicative, such that the lack of any one requisite factor abolishes the behavior (1 × 1 × 0 = 0). By expressing this principle in a quantitative framework, convergence can be rendered predictive and falsifiable, rather than merely descriptive, opening the way toward a computational analysis of behavior. Establishing this is essential for three reasons. First, it unifies disparate findings across neuroendocrinology, ethology, and neuroscience into a coherent framework, allowing classic observations to be integrated rather than siloed. Second, it provides predictive and falsifiable hypotheses: if any one factor is absent, the behavior should fail, yielding a structure that can be tested experimentally and revised. Third, it offers the potential for generalization across behaviors and species, much like formal laws in physics or biology provide a common explanatory foundation. By reframing convergence as a testable equation, the present framework aims to move behavioral science toward principles that are not only descriptive, but predictive and unifying. 1.2 A multiplicative model Recent theoretical advances in behavioral threat assessment have extended foundational concepts through the ARCH × Φ framework, which formalizes behavior as a multiplicative interaction of Archetype (A), Drive (D), Context (C), and a threshold field (Φ). According to this model, behavior occurs only when all components exceed a requisite threshold; if any one factor is absent or subthreshold, behavioral expression is abolished. 3 This model is represented mathematically as: Behavior = Φ × ( A × D × C ) . This formulation offers one way to codify convergence: behavior does not emerge from additive contributions, but from the conjunctive alignment of all necessary factors, yielding falsifiable predictions. Although illustrated here with the lordosis reflex, the model provides a generalizable template for understanding other motivated behaviors where multiple systems must converge to cross a threshold. 1.3 Lordosis in female rodents The lordosis reflex in female rodents is among the most extensively characterized behaviors in behavioral neuroendocrinology. Lordosis is a stereotyped, spinally mediated posture—ventral arching of the back with tail deflection—that facilitates copulation and is essential for sexual receptivity. Its expression depends on three well-established factors 4 – 7 : • Archetype (A): An intact ventromedial hypothalamic (VMH) circuits; bilateral lesions of the VMH abolish the reflex even in hormonally primed females. • Drive (D): Robust expression requires sequential estradiol priming followed by progesterone administration. Ovariectomized females do not exhibit lordosis unless these hormonal conditions are met. • Context (C): Immediate somatosensory input—specifically, pressure applied to the flanks and hindquarters—triggers the posture; without such stimulation, the reflex is absent. • Threshold Field (Φ): Represents baseline arousal and neuromodulatory tone that scales the product of Archetype, Drive, and Context to determine if a behavior is expressed. Because all three factors are indispensable, lordosis emerges only through their convergence. Decades of empirical work converge on the same principle: removal of any single component abolishes behavior, even when the others are intact. Lordosis reflects the integration of hormonal, neural, and sensory inputs within hypothalamic circuits. This integration has traditionally been described qualitatively, without a formal specification of how the components combine. 7 The following research questions seek to formalize this principle within the ARCH × Φ framework, treating it as a conjunctive, multiplicative equation. This reframing specifies a candidate law of convergence: lordosis occurs only when all factors align above threshold and fails whenever any requisite factor is absent (1 × 1 × 0 = 0). This convergence is highlighted in Figure 1 . Figure 1. Convergence of factors governing lordosis in female rats. The lordosis reflex is expressed only when three conditions converge: an intact ventromedial hypothalamic (VMH) circuit, estradiol–progesterone priming, and tactile flank stimulation provided by a male mount. Absence of any one factor abolishes the behavior, consistent with a candidate law of convergence. 1.4 Research questions This paper explores whether a law of convergence might govern the expression of lordosis in female rats—that is, whether behavior is abolished when any one requisite factor is absent, even if the others are present. To examine this possibility, three classical necessity tests will be analyzed: • Neural archetype (A): Is an intact ventromedial hypothalamic (VMH) circuit required, such that VMH lesions abolish the reflex even under permissive hormonal and contextual conditions? • Hormonal drive (D): Is sequential estradiol priming followed by progesterone indispensable, such that ovariectomy without replacement eliminates the reflex despite intact neural and contextual factors? • Contextual input (C): Is immediate tactile stimulation of the flanks and hindquarters essential, such that its absence precludes lordosis even when neural and hormonal conditions are optimal? 1.5 Hypothesis Lordosis in the female rat is expressed only when the product A × D × C surpasses a critical threshold, with baseline arousal (Φ) held constant. If any single component is absent or reduced to near zero, behavioral expression should fail, regardless of the state of the other factors. 2.1 Overview of the model The ARCH × Φ equation conceptualizes behavior as a conjunctive, multiplicative product, defined by the relationship: Behavior = Φ × ( A × D × C ) In the present analysis, the threshold field (Φ)—representing baseline arousal—is held constant to isolate and evaluate the necessity of Archetype (A), Drive (D), and Context (C) for lordosis expression in female rats. The following subsections outline how each factor is operationalized, drawing on extensive foundational work in behavioral neuroendocrinology. 4 – 7 2.2 Archetype (A): Neural substrate • Definition: An intact ventromedial hypothalamic (VMH) circuit, particularly the ventrolateral subdivision (VMHvl), is required for lordosis. • Operationalization: ○ A ≈ 1: VMHvl neurons and their projections to the periaqueductal gray (PAG) are functionally intact. ○ A ≈ 0: Bilateral VMH lesions or loss of connectivity abolish lordosis, even under permissive hormonal and contextual conditions. • Key Evidence: Classic studies demonstrated that lesioning the VMH eliminates lordosis in hormonally primed females, whereas electrical or hormonal stimulation can restore the reflex. 7 More recent circuit-level approaches have reinforced the VMHvl’s role as a causal node. Optogenetic manipulations of hypothalamic circuits demonstrate that VMHvl activity is both necessary and sufficient for specific motivated behaviors, including social and sexual responses, 8 and reviews of VMHvl circuitry highlight its broader function as a hub for social, aggressive, and reproductive behaviors. 9 2.3 Drive (D): Hormonal priming • Definition: Behavior is gated by circulating ovarian hormones, with estradiol and progesterone playing central roles in sexual receptivity. • Operationalization: • D ≈ 1: Ovariectomized females sequentially primed with estradiol and progesterone exhibit robust lordosis quotients. • D ≈ 0: Ovariectomized females lacking hormone replacement do not express lordosis. • Nuance: Estradiol alone, administered at sufficiently high doses for ≥6 days, can induce lordosis, illustrating that drive is a threshold-dependent cascade rather than strictly binary. • Key Evidence: Estradiol primes the VMH, enabling progesterone to activate lordosis circuits. 2.4 Context (C): Somatosensory stimulation • Definition: Immediate tactile input to the flanks and hindquarters is necessary to release the lordosis reflex. • Operationalization: • C ≈ 1: Adequate flank or tail-base pressure provided by a male mount or calibrated manual palpation. • C ≈ 0: Absence or disruption of somatosensory input (e.g., through denervation) prevents lordosis. • Key Evidence: Lordosis does not occur spontaneously; it requires flank pressure, and denervation abolishes the behavior even in hormonally and neurally permissive contexts. 2.5 Outcome measure In experimental studies, lordosis expression is typically quantified using the lordosis quotient (LQ)—the percentage of male mounts that elicit the posture. 10 In the present paper, I do not collect new behavioral measures; instead, I will rely on decades of published reports of LQ and related behavioral outcomes as proxies for testing the multiplicative model. Within this framework, each factor—neural archetype (A), hormonal drive (D), and contextual input (C)—is operationalized based on classic lesion, hormone, and tactile stimulation studies. The ARCH × Φ model predicts, consistent with this literature, that LQ approximates zero whenever any single component is absent, even when the other two are present. 3.1 Archetype lesion test (A = 0) The neural substrate underlying lordosis is located in the ventrolateral subdivision of the ventromedial hypothalamus (VMHvl), which projects to the periaqueductal gray (PAG). Bilateral lesions of the VMH in female rats abolish lordosis, even when hormonal conditions and tactile stimulation are permissive. 11 Conversely, electrical stimulation or local estradiol infusions targeting the VMHvl can restore sexual receptivity, underscoring this region as the critical neural archetype for the behavior. 12 When A≈0 (VMHvl lesioned), the lordosis quotient (LQ) falls to zero despite intact drive and context. Conclusion: An intact neural archetype is necessary for lordosis; removal of A extinguishes the behavior (1 × 1 × 0 = 0). 3.2 Hormone deprivation (D = 0) Adequate hormonal priming with estradiol and progesterone is crucial for the expression of lordosis. Ovariectomized rats exhibit negligible lordosis unless they are sequentially treated with estradiol followed by progesterone. 13 Estradiol primes the VMH and enables progesterone to activate lordosis circuits. 14 In the absence of these hormones, neither tactile stimulation nor an intact neural substrate suffices to produce the reflex. 10 While chronic, high-dose estradiol alone may eventually permit lordosis, this phenomenon reflects a threshold effect, not evidence against hormonal necessity. 12 Conclusion: Hormonal drive is necessary; deprivation of D abolishes lordosis (1 × 0 × 1 = 0). 3.3 Contextual sensory removal (C = 0) Lordosis does not occur spontaneously; immediate tactile input to the female’s flanks and hindquarters is required. Pressure applied by a male mount or manual palpation reliably triggers the reflex. 7 Disruption of somatosensory input—such as flank or perineal denervation—dramatically reduces or eliminates lordosis, even under optimal hormonal and neural conditions. 12 Without contextual sensory stimulation, the posture is not expressed. Conclusion: Contextual tactile input is necessary; absence of C results in loss of lordosis (1 × 1 × 0 = 0). 3.4 Summary of necessity tests Across lesion, hormonal deprivation, and sensory removal studies, the evidence is consistent: removing any single factor—archetype (A), drive (D), or context (C)—prevents lordosis, even when the remaining conditions are permissive. These necessity tests support the conjunctive multiplicative model: Lordosis = Φ × ( A × D × C ) Each factor is essential, but none is strictly binary. Instead, A, D, and C vary continuously, and lordosis can be understood as a threshold phenomenon: the product Φ·(A·D·C) must exceed some critical value (θ) for expression. Weak contributions from one factor can sometimes be offset by stronger input from the others or by elevated Φ, but if any term approaches zero, the product remains insufficient. This formulation captures the nonlinear dynamics observed in the literature—for example, the robust lordosis elicited by the standard E2→P sequence versus the delayed or weaker expression following chronic estradiol alone—consistent with a sigmoid, threshold-dependent response. 4.1 Conjunctive necessity in Lordosis The present synthesis demonstrates that lordosis in the female rat is expressed only when all three components—Archetype (A), Drive (D), and Context (C)—are present above threshold. Empirical literature provides three independent necessity tests: (1) Lesions of the ventromedial hypothalamus abolish lordosis despite hormones and mounts 6 ; (2) Ovariectomy without hormonal replacement eliminates lordosis despite intact circuitry and tactile input 14 (3) Absence or denervation of flank stimulation prevents lordosis despite permissive hormones and circuitry. 7 In each case, the absence of one factor reduces the behavioral output to zero, consistent with the multiplicative model: Lordosis = Φ × ( A × D × C ) This formalizes long-standing observations in behavioral neuroendocrinology into a single conjunctive law of expression. 4.2 Lordosis as reflex versus motivation A common critique is that lordosis represents a spinally mediated copulatory reflex rather than a measure of sexual motivation. 10 Indeed, motivational processes in female rats are more clearly indexed by paced mating or partner preference paradigms. 15 Acknowledging this distinction, the present model addresses lordosis as a reflexive posture, rather than as a comprehensive measure of motivation. Nonetheless, motivational states likely interact with the contextual term (C) and the arousal field (Φ) to shape the likelihood of tactile stimulation being received and acted upon. Thus, while lordosis itself is not a direct measure of motivation, its gating provides a valuable proof case for conjunctive behavioral control. 4.3 Species and sex boundaries The current framework is deliberately constrained to female rats. Much of the foundational work on the neuroendocrinology of lordosis was conducted in rats, with consistent findings across lesion, hormone, and tactile manipulations. 12 While mice share many features of lordosis circuitry, they exhibit stronger effects of developmental social isolation and strain differences. 16 Similarly, male rodents can show lordosis under atypical hormonal manipulations, but their circuitry differs in organization. Recent circuit-level studies reinforce these distinctions: optogenetic manipulations of the ventrolateral VMH demonstrate its necessity and sufficiency for specific motivated behaviors, including aggression and reproduction, while also revealing sex-specific patterns of connectivity and activation. 9 For these reasons, the present synthesis is restricted to female rats as a clean test case, with the expectation that comparative extensions across species and sexes will further test the generality of the model. 4.4 The role of Φ (Arousal, stress, and neuromodulation) In this analysis, Φ was held constant. However, decades of research demonstrate that arousal systems—including dopaminergic and serotonergic tone—modulate the threshold for lordosis. 17 , 18 Dopaminergic facilitation can permit lordosis with reduced hormonal priming, whereas serotonergic activation can suppress lordosis even under optimal endocrine conditions. Consistent with this, psychostimulant studies show that elevating dopaminergic tone with agents such as amphetamine or cocaine can allow lordosis to occur under otherwise suboptimal hormonal conditions, providing pharmacological support for the idea that Φ functions as a manipulable threshold-scaling factor. Experimental evidence also indicates that lordosis can be strengthened : intravenous progesterone or central infusion of a D1 dopamine agonist rapidly facilitates the reflex in estrogen-primed females, and higher-intensity flank stimulation yields stronger responses. 19 , 20 These findings suggest that Φ, along with C, can shift lordosis probability in a dose-dependent manner. Stress offers another well-documented influence. Activation of the hypothalamic–pituitary–adrenal (HPA) axis, and particularly elevated corticosterone, reduces sexual receptivity in female rats. 21 , 22 Developmental stressors such as social isolation during puberty can produce long-lasting reductions in lordosis even with appropriate hormonal treatment. 23 Acute stressors, including restraint or exposure to predator odor, can likewise suppress lordosis expression. 24 , 25 Puberty itself can also be viewed as a developmental threshold. Only when neural circuits such as the VMH mature, ovarian cycles provide the estradiol–progesterone sequence, social experience calibrates contextual responsiveness, and arousal systems stabilize, does A × D × C, scaled by Φ, surpass the critical value required for lordosis. Before puberty, at least one of these factors is typically absent or subthreshold, preventing expression of the reflex. Taken together, these findings suggest that Φ is not merely a generalized arousal index but a dynamic state variable that incorporates neuromodulatory, stress-axis, and developmental influences. By scaling the product of A × D × C, Φ shifts the effective threshold for lordosis, accounting for both suppression under stress and facilitation under dopaminergic stimulation. 4.5 Predictions and future directions The conjunctive model yields several testable predictions: • Zeroed components veto behavior: If any single factor (A, D, or C) is reduced to near zero, lordosis should fail, regardless of the magnitude of the others. • Threshold dynamics: Near threshold, small changes in hormone dose, tactile stimulation intensity, or neuromodulator tone should produce nonlinear changes in lordosis quotient (LQ). • Interaction effects: Elevating Φ (e.g., via dopaminergic facilitation) should reduce the level of D or C required for expression, whereas lowering Φ (e.g., via serotonergic activation or stress) should increase these requirements. These predictions are amenable to factorial experimental designs, such as dose–response manipulations of estradiol and progesterone, calibrated flank pressure paradigms, and pharmacological modulation of arousal systems. 4.6 Lordosis as a convergence phenomenon The present analysis suggests that decades of empirical work on lordosis can be reframed within a formal conjunctive model. Where Lewin (1936) described behavior as a function of person and environment, 1 the ARCH × Φ framework extends this logic by specifying neural archetype, hormonal drive, contextual input, and arousal threshold. Each necessity test highlights the role of convergence: • Loss of A (VMH lesions): Lordosis fails despite optimal hormones and context. • Loss of D (ovariectomy without replacement): Lordosis fails despite intact circuits and tactile stimulation. • Loss of C (absence of flank pressure or denervation): Lordosis fails despite permissive neural and hormonal states. Together, these observations illustrate that lordosis is abolished whenever one factor is absent, even if the others are present. In contrast, full expression emerges reliably only through the convergence of all three conditions, scaled by Φ. This exploratory synthesis raises the possibility that conjunctive multiplicative gating may represent a more general principle of behavioral expression across motivated acts, including aggression, caregiving, and social bonding. 4.7 Strengths and weaknesses of the present study A key strength of this work is its synthesis of decades of neuroendocrinological and ethological research into a simple, falsifiable framework. By formalizing the idea of convergence as a conjunctive equation, this paper organizes classic findings on lesions, hormone manipulations, and contextual stimulation into a coherent model. The ARCH × Φ framework highlights threshold dynamics that were implicit in earlier work and generates concise predictions for future experiments. The use of well-characterized behaviors such as lordosis, with a long empirical history and robust replication across laboratories, further strengthens the validity of the model as a proof-of-concept. At the same time, several limitations must be acknowledged. This paper does not present new empirical data; instead, it relies on published findings as proxies for A, D, and C. The formalism is necessarily a simplification, treating complex biological systems as multiplicative variables. In reality, cross-dependencies exist—for example, estradiol influences both D and A through receptor induction, and stress can alter C as well as Φ. Moreover, the model is currently static, describing a threshold at a given time point rather than dynamic changes across cycles or developmental stages. Finally, while lordosis is an excellent test case, it represents a reflexive posture rather than a full measure of sexual motivation, and caution is needed in generalizing beyond this specific behavior. Taken together, the present study should be viewed as an exploratory step: a proposal to reframe existing findings as a candidate law of convergence. Its strength lies in clarifying logic and generating predictions; its weakness lies in its reliance on secondary data and abstraction. Future work should aim to empirically test the model with factorial designs, parametric manipulations, and cross-species comparisons. 4.8 Future experiments Although this paper relies on existing studies, several targeted experiments could directly test the convergence model. Factorial designs that systematically vary estradiol and progesterone doses (D) alongside calibrated flank stimulation (C) would reveal whether lordosis expression follows the predicted sigmoid threshold function, with small parametric changes near the boundary producing sharp transitions in lordosis quotient. Manipulations of the ventromedial hypothalamus (A), through partial lesions or reversible inhibition, would test whether reducing archetypal integrity shifts the hormonal and contextual requirements upward. Neuromodulatory manipulations of Φ, such as dopaminergic facilitation with low-dose amphetamine or D1 agonists, or serotonergic activation and corticosterone exposure, could determine whether the arousal term acts as a gain factor that rescales the effective threshold. Developmental studies across puberty, including social isolation paradigms, would help establish whether convergence thresholds emerge only after neural, hormonal, and contextual systems mature together. Finally, closed-loop circuit manipulations during mounts could provide causal evidence that ventrolateral ventromedial hypothalamus (VMHvl) to the periaqueductal gray (PAG) output gates lordosis in a multiplicative, conjunctive manner. A recent analysis showed that VMHvl population activity during mating follows a line attractor whose state tracks female receptivity. 26 Their recurrent dynamical-systems model demonstrates that receptivity emerges only when neural activity crosses a threshold—very similar to the present proposal that lordosis requires the convergence of archetype, drive, and context. In this way, their computational approach provides a circuit-level example of the same thresholded convergence principle formalized here as a multiplicative law. Although lordosis provides an ideal proof case due to its extensive empirical foundation, the convergence model could also be applied to other ethologically salient behaviors and across species. Maternal caregiving may require the convergence of hypothalamic circuits (archetype), prolactin and oxytocin priming (drive), pup cues (context), and an appropriate arousal state (Φ). 27 Predator defense appears to depend on amygdalar and PAG circuits, stress hormones, and immediate threat cues. 28 Courtship, aggression, and social bonding may each have analogous conjunctive structures. Together, such experiments would move the present exploratory synthesis from a restatement of existing knowledge toward a directly testable and potentially generalizable framework for understanding convergence in behavior. 4.9 Falsifiability A central strength of the convergence model is that it generates falsifiable predictions. The law of convergence holds that lordosis should be absent if any one requisite factor—neural archetype (A), hormonal drive (D), or contextual input (C)—is missing, even if the others are intact. This stands in contrast to an additive model, which would predict that partial contributions from two strong factors could compensate for the absence of a third. 29 In the multiplicative framework, by contrast, any zero term vetoes the outcome (1 × 1 × 0 = 0). These computations are summarized in Table 1 . Table 1. Additive versus multiplicative predictions for lordosis. Factors present Additive prediction Multiplicative prediction A + D (no C) Partial No (0) A + C (no D) Partial No (0) D + C (no A) Partial No (0) A + D + C (all three) Full Yes 1 The model is therefore refutable in specific ways. If future experiments were to show that lordosis can be robustly expressed without an intact VMH circuit, in the complete absence of estradiol and progesterone, or without flank stimulation, the current framework would be falsified. Similarly, if manipulations of Φ, such as dopaminergic facilitation or serotonergic suppression, failed to shift the threshold at which A × D × C yields behavior, the proposed role of Φ as a scaling factor would not be supported. These boundary conditions ensure that the model is not only descriptive but testable, inviting empirical validation or revision. 5. Conclusion The present analysis suggests that lordosis in the female rat provides a uniquely well-characterized system for examining how behavior emerges only through the convergence of multiple factors. Reframing decades of empirical findings within the ARCH × Φ framework emphasizes that neural circuitry, hormonal drive, and contextual input are each indispensable; the absence of any one abolishes the behavior, while their joint alignment above threshold produces a reliable all-or-none reflex. The addition of Φ as an arousal and modulatory field helps account for how stress, neuromodulators, and developmental transitions shift the effective threshold. This exploratory synthesis advances a candidate law of convergence: behavior is expressed only when all necessary conditions align above threshold, and it fails with the loss of any one — 1 × 1 × 0 = 0. While developed in the context of lordosis, this principle may extend to other motivated behaviors where convergence defines the boundary between latent potential and expressed action. In doing so, the framework also returns to Lewin’s vision of a field theory of behavior, inspired by Einstein’s equations in physics. Lewin argued that behavior arises from the interplay between person and environment, rather than from either alone. The present analysis builds on that vision by specifying how neural circuits, hormones, context, and arousal must converge to cross a behavioral threshold. The value of this proposal lies in making explicit what has long been implicit: behavior is not additive but conjunctive. By formalizing this principle, the model generates falsifiable predictions, invites direct experimental tests, and opens the possibility that similar convergence laws may govern diverse motivated acts. In this sense, the framework aims not only to honor Lewin’s project of a behavioral field theory but also to advance it toward genuine scientific law—transforming descriptions into predictions and fragmented findings into unifying principles. AI disclosure Portions of this manuscript, including text drafting, organization, tables, diagrams and language refinement, were assisted by OpenAI’s GPT-5. The AI was used to improve clarity, style, and structure, but all conceptual content, interpretation of findings, and final revisions were developed and approved by the author. The author assumes full responsibility for the accuracy, integrity, and originality of the work. 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PubMed Abstract | Publisher Full Text | Free Full Text Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 18 Sep 2025 ADD YOUR COMMENT Comment Author details Author details Psychiatry, Washington University in St Louis, St. Louis, Missouri, 63110, USA Tahir Rahman Roles: Conceptualization, Writing – Original Draft Preparation Competing interests No competing interests were disclosed. Grant information The author(s) declared that no grants were involved in supporting this work. Article Versions (2) version 2 Revised Published: 02 Feb 2026, 14:939 https://doi.org/10.12688/f1000research.169980.2 version 1 Published: 18 Sep 2025, 14:939 https://doi.org/10.12688/f1000research.169980.1 Copyright © 2025 Rahman T. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Rahman T. Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.12688/f1000research.169980.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 1 VERSION 1 PUBLISHED 18 Sep 2025 Views 0 Cite How to cite this report: Sergio TDO. Reviewer Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r437873 ) The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-437873 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 29 Dec 2025 Thatiane De Oliveira Sergio , Indiana University School of Medicine (IUSOM), Indianapolis, USA Not Approved VIEWS 0 https://doi.org/10.5256/f1000research.187384.r437873 The author presents a theoretical synthesis proposing a formal, multiplicative "law of convergence" for behavioral expression, using the lordosis reflex in female rats as a model system. The proposed ARCH × Φ framework posits that Behavior = Φ(A × D ... Continue reading READ ALL The author presents a theoretical synthesis proposing a formal, multiplicative "law of convergence" for behavioral expression, using the lordosis reflex in female rats as a model system. The proposed ARCH × Φ framework posits that Behavior = Φ(A × D × C), where A (Archetype/neural substrate), D (Drive/hormonal priming), and C (Context/sensory input) are conjunctively necessary, and Φ is a modulatory threshold field (arousal, stress). The manuscript reviews decades of classic neuroendocrinology literature to argue that lesion (VMH), hormone deprivation (ovariectomy), and sensory removal (flank denervation) studies each independently abolish lordosis, supporting a multiplicative (1×1×0=0) rather than additive model. The author contends this reframing moves the field from qualitative description to a predictive, falsifiable, and potentially generalizable quantitative principle. The manuscript addresses a significant and often-overlooked conceptual gap: the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior. The core insight that classic findings in lordosis research exemplify a conjunctive logic is compelling and intellectually valuable. The writing is clear, and the historical framing (Lewin, Tinbergen) is appropriate. However, in its current form, the manuscript presents a compelling re-description of existing knowledge more than a novel theoretical advance or a rigorously tested model. The claim of a new "law" is overstated without stronger empirical validation or a more critical engagement with the complexities and exceptions in the literature. Thus, to be considered a significant theoretical advance suitable for Indexing in a competitive journal, it requires substantial revision to moderate its claims, deepen its engagement with the complexity of the data, and demonstrate the predictive, quantitative utility of the proposed framework beyond elegant re-description. Is the work clearly and accurately presented and does it cite the current literature? Partly Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Partly If applicable, is the statistical analysis and its interpretation appropriate? Partly Are all the source data underlying the results available to ensure full reproducibility? Partly Are the conclusions drawn adequately supported by the results? Partly Competing Interests: No competing interests were disclosed. Reviewer Expertise: Behavioral Pharmacology I confirm that I have read this submission and believe that I have an appropriate level of expertise to state that I do not consider it to be of an acceptable scientific standard, for reasons outlined above. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Sergio TDO. Reviewer Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r437873 ) The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-437873 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant ... Continue reading Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant conceptual gap—namely, the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior—and we agree with the reviewer that the initial version risked being read as an elegant re-description rather than a substantive theoretical advance. I have therefore made substantial revisions to moderate claims, deepen engagement with the literature's complexity, and strengthen the empirical and quantitative grounding of the framework. First, I have revised the framing of novelty and scope. The manuscript no longer proposes a “law” of behavioral convergence. Instead, ARCH × Φ is explicitly presented as a candidate, falsifiable principle whose validity depends on empirical testing. This change directly addresses the reviewer’s concern about overstated claims and aligns the work more closely with the standards for theoretical synthesis. Second, we have added explicit quantitative validation. A new Results subsection now includes a quantitative reanalysis of classic lordosis dose–response data from Hardy and DeBold (1971). Using normalized lordosis quotient data, I fit and compare additive, threshold-linear, and multiplicative threshold models. Model comparison using information criteria demonstrates that the multiplicative threshold formulation captures sharp transitions and probability–magnitude dissociations that additive alternatives fail to explain. This analysis moves the framework beyond qualitative re-description to demonstrable quantitative discrimination. Third, I have expanded methodological transparency and reproducibility. Appendix C now provides a detailed, step-by-step quantitative workflow describing data normalization, model specification, fitting procedures, and model comparison metrics. While the paper does not introduce new primary data, all analyses are reproducible from published datasets, and the methods are explicitly documented. Fourth, I have engaged more critically with the literature's complexity and exceptions. The revised manuscript incorporates sensory-induced lordosis in ovariectomized animals (e.g., Komisaruk and colleagues) as boundary-condition cases rather than counterexamples, clarifying how intense contextual input or threshold modulation can transiently compensate for reduced drive without violating conjunctive necessity. This strengthens the model by integrating, rather than excluding, apparent exceptions. Finally, I have sharpened the predictive and falsifiable content. The revised Falsifiability section now specifies concrete factorial designs and model-comparison criteria that could empirically disconfirm the multiplicative veto structure, addressing the reviewer’s concern that predictive utility be demonstrated rather than asserted. In summary, I have substantially revised the manuscript to move it from a primarily conceptual synthesis toward a quantitatively anchored, empirically constrained, and explicitly falsifiable theoretical framework. I am grateful to Reviewer 2 for identifying the key areas requiring strengthening, and I now believe the revised version more fully meets the standards for a significant theoretical contribution. Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant conceptual gap—namely, the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior—and we agree with the reviewer that the initial version risked being read as an elegant re-description rather than a substantive theoretical advance. I have therefore made substantial revisions to moderate claims, deepen engagement with the literature's complexity, and strengthen the empirical and quantitative grounding of the framework. First, I have revised the framing of novelty and scope. The manuscript no longer proposes a “law” of behavioral convergence. Instead, ARCH × Φ is explicitly presented as a candidate, falsifiable principle whose validity depends on empirical testing. This change directly addresses the reviewer’s concern about overstated claims and aligns the work more closely with the standards for theoretical synthesis. Second, we have added explicit quantitative validation. A new Results subsection now includes a quantitative reanalysis of classic lordosis dose–response data from Hardy and DeBold (1971). Using normalized lordosis quotient data, I fit and compare additive, threshold-linear, and multiplicative threshold models. Model comparison using information criteria demonstrates that the multiplicative threshold formulation captures sharp transitions and probability–magnitude dissociations that additive alternatives fail to explain. This analysis moves the framework beyond qualitative re-description to demonstrable quantitative discrimination. Third, I have expanded methodological transparency and reproducibility. Appendix C now provides a detailed, step-by-step quantitative workflow describing data normalization, model specification, fitting procedures, and model comparison metrics. While the paper does not introduce new primary data, all analyses are reproducible from published datasets, and the methods are explicitly documented. Fourth, I have engaged more critically with the literature's complexity and exceptions. The revised manuscript incorporates sensory-induced lordosis in ovariectomized animals (e.g., Komisaruk and colleagues) as boundary-condition cases rather than counterexamples, clarifying how intense contextual input or threshold modulation can transiently compensate for reduced drive without violating conjunctive necessity. This strengthens the model by integrating, rather than excluding, apparent exceptions. Finally, I have sharpened the predictive and falsifiable content. The revised Falsifiability section now specifies concrete factorial designs and model-comparison criteria that could empirically disconfirm the multiplicative veto structure, addressing the reviewer’s concern that predictive utility be demonstrated rather than asserted. In summary, I have substantially revised the manuscript to move it from a primarily conceptual synthesis toward a quantitatively anchored, empirically constrained, and explicitly falsifiable theoretical framework. I am grateful to Reviewer 2 for identifying the key areas requiring strengthening, and I now believe the revised version more fully meets the standards for a significant theoretical contribution. Competing Interests: No competing interests were disclosed. Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant ... Continue reading Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant conceptual gap—namely, the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior—and we agree with the reviewer that the initial version risked being read as an elegant re-description rather than a substantive theoretical advance. I have therefore made substantial revisions to moderate claims, deepen engagement with the literature's complexity, and strengthen the empirical and quantitative grounding of the framework. First, I have revised the framing of novelty and scope. The manuscript no longer proposes a “law” of behavioral convergence. Instead, ARCH × Φ is explicitly presented as a candidate, falsifiable principle whose validity depends on empirical testing. This change directly addresses the reviewer’s concern about overstated claims and aligns the work more closely with the standards for theoretical synthesis. Second, we have added explicit quantitative validation. A new Results subsection now includes a quantitative reanalysis of classic lordosis dose–response data from Hardy and DeBold (1971). Using normalized lordosis quotient data, I fit and compare additive, threshold-linear, and multiplicative threshold models. Model comparison using information criteria demonstrates that the multiplicative threshold formulation captures sharp transitions and probability–magnitude dissociations that additive alternatives fail to explain. This analysis moves the framework beyond qualitative re-description to demonstrable quantitative discrimination. Third, I have expanded methodological transparency and reproducibility. Appendix C now provides a detailed, step-by-step quantitative workflow describing data normalization, model specification, fitting procedures, and model comparison metrics. While the paper does not introduce new primary data, all analyses are reproducible from published datasets, and the methods are explicitly documented. Fourth, I have engaged more critically with the literature's complexity and exceptions. The revised manuscript incorporates sensory-induced lordosis in ovariectomized animals (e.g., Komisaruk and colleagues) as boundary-condition cases rather than counterexamples, clarifying how intense contextual input or threshold modulation can transiently compensate for reduced drive without violating conjunctive necessity. This strengthens the model by integrating, rather than excluding, apparent exceptions. Finally, I have sharpened the predictive and falsifiable content. The revised Falsifiability section now specifies concrete factorial designs and model-comparison criteria that could empirically disconfirm the multiplicative veto structure, addressing the reviewer’s concern that predictive utility be demonstrated rather than asserted. In summary, I have substantially revised the manuscript to move it from a primarily conceptual synthesis toward a quantitatively anchored, empirically constrained, and explicitly falsifiable theoretical framework. I am grateful to Reviewer 2 for identifying the key areas requiring strengthening, and I now believe the revised version more fully meets the standards for a significant theoretical contribution. Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant conceptual gap—namely, the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior—and we agree with the reviewer that the initial version risked being read as an elegant re-description rather than a substantive theoretical advance. I have therefore made substantial revisions to moderate claims, deepen engagement with the literature's complexity, and strengthen the empirical and quantitative grounding of the framework. First, I have revised the framing of novelty and scope. The manuscript no longer proposes a “law” of behavioral convergence. Instead, ARCH × Φ is explicitly presented as a candidate, falsifiable principle whose validity depends on empirical testing. This change directly addresses the reviewer’s concern about overstated claims and aligns the work more closely with the standards for theoretical synthesis. Second, we have added explicit quantitative validation. A new Results subsection now includes a quantitative reanalysis of classic lordosis dose–response data from Hardy and DeBold (1971). Using normalized lordosis quotient data, I fit and compare additive, threshold-linear, and multiplicative threshold models. Model comparison using information criteria demonstrates that the multiplicative threshold formulation captures sharp transitions and probability–magnitude dissociations that additive alternatives fail to explain. This analysis moves the framework beyond qualitative re-description to demonstrable quantitative discrimination. Third, I have expanded methodological transparency and reproducibility. Appendix C now provides a detailed, step-by-step quantitative workflow describing data normalization, model specification, fitting procedures, and model comparison metrics. While the paper does not introduce new primary data, all analyses are reproducible from published datasets, and the methods are explicitly documented. Fourth, I have engaged more critically with the literature's complexity and exceptions. The revised manuscript incorporates sensory-induced lordosis in ovariectomized animals (e.g., Komisaruk and colleagues) as boundary-condition cases rather than counterexamples, clarifying how intense contextual input or threshold modulation can transiently compensate for reduced drive without violating conjunctive necessity. This strengthens the model by integrating, rather than excluding, apparent exceptions. Finally, I have sharpened the predictive and falsifiable content. The revised Falsifiability section now specifies concrete factorial designs and model-comparison criteria that could empirically disconfirm the multiplicative veto structure, addressing the reviewer’s concern that predictive utility be demonstrated rather than asserted. In summary, I have substantially revised the manuscript to move it from a primarily conceptual synthesis toward a quantitatively anchored, empirically constrained, and explicitly falsifiable theoretical framework. I am grateful to Reviewer 2 for identifying the key areas requiring strengthening, and I now believe the revised version more fully meets the standards for a significant theoretical contribution. Competing Interests: No competing interests were disclosed. Close Report a concern COMMENT ON THIS REPORT Views 0 Cite How to cite this report: Komisaruk B. Reviewer Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r416428 ) The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-416428 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 10 Nov 2025 Barry Komisaruk , Psychology, rutgers university, Newark, New Jersey, USA Not Approved VIEWS 0 https://doi.org/10.5256/f1000research.187384.r416428 There is a fundamental flaw in the author's multiple assertions throughout the manuscript that estrogen is necessary for lordosis to be elicited...it is not! It appears the author is not aware of, or is discounting, existing evidence that refutes a ... Continue reading READ ALL There is a fundamental flaw in the author's multiple assertions throughout the manuscript that estrogen is necessary for lordosis to be elicited...it is not! It appears the author is not aware of, or is discounting, existing evidence that refutes a major assertion in his concept; as the evidence in the attached literature shows, contrary to the author's assertion, estrogen is, in fact, NOT required for lordosis. Thus, the neural circuits for lordosis are still functional in the absence of estrogen, evidence that estrogen is a sufficient but not necessary condition for lordosis. The vaginocervical probing alone produces immobilization (and potent analgesia) but not lordosis, but at the moment when flank stimulation is then added to the vaginocervical probing, strikingly, the lordosis response occurs immediately. The author should refer to the 3 attached papers: (KOMISARUK, et al., 1973) - Ref 1; (Rodriguez-Sierra, et al., 1977) - Ref 2; (Rodriguez-Sierra, et al., 1975) - Ref 3, that demonstrate that the neural system for lordosis can be activated in the absence of estrogen and progesterone, in relation to the statement in the present manuscript in Section 4.9: "The model is therefore refutable in specific ways. If future experiments were to show that lordosis can be robustly expressed without an intact VMH circuit, in the complete absence of estradiol and progesterone, or without flank stimulation, the current framework would be falsified." Is the work clearly and accurately presented and does it cite the current literature? No Is the study design appropriate and is the work technically sound? No Are sufficient details of methods and analysis provided to allow replication by others? Partly If applicable, is the statistical analysis and its interpretation appropriate? Not applicable Are all the source data underlying the results available to ensure full reproducibility? No Are the conclusions drawn adequately supported by the results? No References 1. KOMISARUK B, DIAKOW C: Lordosis Reflex Intensity in Rats in Relation to the Estrous Cycle, Ovariectomy, Estrogen Administration and Mating Behavior. Endocrinology . 1973; 93 (3): 548-557 Publisher Full Text 2. Rodriguez-Sierra J, Crowley W, Komisaruk B: Induction of lordosis responsiveness by vaginal stimulation in rats is independent of anterior or posterior pituitary hormones. Hormones and Behavior . 1977; 8 (3): 348-355 Publisher Full Text 3. Rodriguez-Sierra J, Crowley W, Komisaruk B: Vaginal stimulation in rats induces prolonged lordosis responsiveness and sexual receptivity. Journal of Comparative and Physiological Psychology . 1975; 89 (1): 79-85 Publisher Full Text Competing Interests: No competing interests were disclosed. Reviewer Expertise: Neuroendocrinology of sexual behavior I confirm that I have read this submission and believe that I have an appropriate level of expertise to state that I do not consider it to be of an acceptable scientific standard, for reasons outlined above. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Komisaruk B. Reviewer Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r416428 ) The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-416428 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and ... Continue reading Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and hindquarter input that directly releases the lordosis fixed action pattern. VCS is a visceral input that modulates excitability—producing immobilization, analgesia, and transient stress—but does not initiate the reflex. It therefore enhances, rather than defines, the C variable (Mani et al., 1997; Blaustein & Erskine, 2002). Komisaruk and colleagues showed that VCS paired with flank pressure can elicit lordosis in hormonally experienced rats, but only after estradiol-dependent neural plasticity has been established (Komisaruk & Diakow, 1973; Micevych et al., 2009). Estradiol induces lasting synaptic and receptor changes in the VMH–PAG–spinal pathway (e.g., progesterone receptor insertion, β-endorphin modulation) that persist after hormone withdrawal (Micevych et al., 2009; Blaustein & Micevych, 2009). Thus, this behavior represents reactivation of an estrogen-sensitized circuit by convergent sensory input. Lordosis never occurs in prepubertal or hormonally naïve females, even with intense flank or VCS stimulation (Erskine, 1985; Powers, 1970). Pubertal estradiol exposure is essential for organizing hypothalamic and spinal circuitry; animals ovariectomized before puberty fail to respond to adult hormone replacement (Pfaff, 1980; Beach, 1981). Mechanical stimulation in such rats produces only escape or immobility (Hardy & DeBold, 1972). This is an important part of the ARCH model which I should include. Even after ovariectomy, low estrogen levels persist through adrenal and neural steroidogenesis (Zarrow et al., 1969; Roselli et al., 1984), maintaining subthreshold receptor activation. Hence, “hormone-independent” lordosis likely occurs under minimal but active estrogenic tone rather than steroid absence (Pfaff, 1980; Blaustein & Micevych, 2009). Within the ARCH × Φ model, the Komisaruk paradigm reflects an intact circuit (A = 1), residual hormonal drive (D ≈ 0.5), a " supernormal stimuli " sensory context (C > 1), and heightened neuromodulatory tone (Φ ≈ 2). Behavior crosses threshold primarily due to amplified sensory and arousal inputs, exemplifying a supernormal releasing mechanism acting on a hormonally conditioned system (Komisaruk & Diakow, 1973; Tinbergen, 1951). This paper should be revised with the above information for clarity. Blaustein, J. D., & Micevych, P. E. (2009). Estrogen receptor signaling in brain: A framework for the regulation of neuroendocrine and behavioral processes. Frontiers in Neuroendocrinology, 30 (2), 173–179. Pfaff, D. W. (1980). Estrogen and brain function: Neural analysis of a hormone-controlled mammalian reproductive behavior. Physiology of Reproduction. Raven Press, New York , 1 , 1517-1519. Powers, J. B. (1970). Hormonal control of sexual receptivity during the estrous cycle of the rat. Physiology & Behavior , 5 (8), 831-835. Roselli, C. E., & Resko, J. A. (1993). Aromatase activity in the rat brain: hormonal regulation and sex differences. The Journal of steroid biochemistry and molecular biology , 44 (4-6), 499-508. Tinbergen, N. (1951). The study of instinct. Oxford: Clarendon Press. Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and hindquarter input that directly releases the lordosis fixed action pattern. VCS is a visceral input that modulates excitability—producing immobilization, analgesia, and transient stress—but does not initiate the reflex. It therefore enhances, rather than defines, the C variable (Mani et al., 1997; Blaustein & Erskine, 2002). Komisaruk and colleagues showed that VCS paired with flank pressure can elicit lordosis in hormonally experienced rats, but only after estradiol-dependent neural plasticity has been established (Komisaruk & Diakow, 1973; Micevych et al., 2009). Estradiol induces lasting synaptic and receptor changes in the VMH–PAG–spinal pathway (e.g., progesterone receptor insertion, β-endorphin modulation) that persist after hormone withdrawal (Micevych et al., 2009; Blaustein & Micevych, 2009). Thus, this behavior represents reactivation of an estrogen-sensitized circuit by convergent sensory input. Lordosis never occurs in prepubertal or hormonally naïve females, even with intense flank or VCS stimulation (Erskine, 1985; Powers, 1970). Pubertal estradiol exposure is essential for organizing hypothalamic and spinal circuitry; animals ovariectomized before puberty fail to respond to adult hormone replacement (Pfaff, 1980; Beach, 1981). Mechanical stimulation in such rats produces only escape or immobility (Hardy & DeBold, 1972). This is an important part of the ARCH model which I should include. Even after ovariectomy, low estrogen levels persist through adrenal and neural steroidogenesis (Zarrow et al., 1969; Roselli et al., 1984), maintaining subthreshold receptor activation. Hence, “hormone-independent” lordosis likely occurs under minimal but active estrogenic tone rather than steroid absence (Pfaff, 1980; Blaustein & Micevych, 2009). Within the ARCH × Φ model, the Komisaruk paradigm reflects an intact circuit (A = 1), residual hormonal drive (D ≈ 0.5), a " supernormal stimuli " sensory context (C > 1), and heightened neuromodulatory tone (Φ ≈ 2). Behavior crosses threshold primarily due to amplified sensory and arousal inputs, exemplifying a supernormal releasing mechanism acting on a hormonally conditioned system (Komisaruk & Diakow, 1973; Tinbergen, 1951). This paper should be revised with the above information for clarity. Blaustein, J. D., & Micevych, P. E. (2009). Estrogen receptor signaling in brain: A framework for the regulation of neuroendocrine and behavioral processes. Frontiers in Neuroendocrinology, 30 (2), 173–179. Pfaff, D. W. (1980). Estrogen and brain function: Neural analysis of a hormone-controlled mammalian reproductive behavior. Physiology of Reproduction. Raven Press, New York , 1 , 1517-1519. Powers, J. B. (1970). Hormonal control of sexual receptivity during the estrous cycle of the rat. Physiology & Behavior , 5 (8), 831-835. Roselli, C. E., & Resko, J. A. (1993). Aromatase activity in the rat brain: hormonal regulation and sex differences. The Journal of steroid biochemistry and molecular biology , 44 (4-6), 499-508. Tinbergen, N. (1951). The study of instinct. Oxford: Clarendon Press. Competing Interests: N/A Close Report a concern Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I ... Continue reading Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I agree that our original wording overstated the necessity of estrogen for lordosis expression, and we appreciate the opportunity to clarify and correct this point. The reviewer is quite correct that multiple studies demonstrate that lordosis can be elicited in ovariectomized rats in the absence of estradiol and progesterone when specific patterns of sensory stimulation are applied, particularly convergent vaginocervical stimulation combined with flank stimulation (Komisaruk et al., 1973; Rodriguez-Sierra et al., 1975; Rodriguez-Sierra et al., 1977). These findings establish that estrogen is not strictly necessary for activation of the lordosis motor pattern under all conditions, and we have revised the manuscript accordingly. Crucially, however, we do not interpret these results as evidence that estrogen is irrelevant to lordosis control, nor as a failure of conjunctive necessity. Rather, these studies demonstrate that sensory context can transiently compensate for reduced neurohumoral drive, consistent with a threshold-based convergence model. In ARCH × Φ terms, intense or patterned vaginocervical stimulation constitutes a supernormal contextual input (C↑) and/or induces transient elevation of the threshold field (Φ), permitting execution of the archetypal motor pattern despite low or absent circulating ovarian steroids (D↓). Importantly, these effects are typically transient, state-dependent, and do not reproduce the full duration, intensity, or stability of hormonally primed receptivity, as also noted in the cited literature. I have therefore revised Section 4.9 (Falsifiability) and related passages to remove the incorrect claim that estrogen absence alone would falsify the model. The falsification criterion has been narrowed appropriately: the framework would be challenged only if robust, sustained lordosis were demonstrated under physiological conditions following complete elimination of neurohumoral drive without compensatory elevation of contextual input or threshold state. This distinction now explicitly incorporates the Komisaruk/Rodriguez-Sierra findings as boundary-condition tests rather than counterexamples. I have also added explicit citations to the three papers identified by the reviewer and expanded the discussion of sensory-induced lordosis to acknowledge their contributions and formally integrate their findings into the ARCH × Φ logic. In doing so, the model becomes more accurate and more empirically grounded, rather than weakened. Regarding the reviewer’s broader concerns about clarity, study design, and support for conclusions: we note that this work is explicitly a theoretical and quantitative synthesis rather than a primary experimental report. In the revised version, we have strengthened methodological transparency by (i) adding a quantitative reanalysis of published lordosis quotient data (Hardy & DeBold, 1971), (ii) providing explicit model comparison procedures and goodness-of-fit metrics, and (iii) clarifying the operationalization of latent variables (A, D, C, Φ) and their falsifiability. These additions directly address concerns about rigor, reproducibility, and empirical support. In summary, I thank the reviewer for identifying a necessary correction. The revised manuscript now accurately reflects the literature, incorporates the key Komisaruk/Rodriguez-Sierra findings as critical empirical constraints, and presents a more precise and defensible formulation of conjunctive, threshold-governed control of lordosis expression. It is also an honor to be reviewed by one of the "founding fathers" in the field. Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I agree that our original wording overstated the necessity of estrogen for lordosis expression, and we appreciate the opportunity to clarify and correct this point. The reviewer is quite correct that multiple studies demonstrate that lordosis can be elicited in ovariectomized rats in the absence of estradiol and progesterone when specific patterns of sensory stimulation are applied, particularly convergent vaginocervical stimulation combined with flank stimulation (Komisaruk et al., 1973; Rodriguez-Sierra et al., 1975; Rodriguez-Sierra et al., 1977). These findings establish that estrogen is not strictly necessary for activation of the lordosis motor pattern under all conditions, and we have revised the manuscript accordingly. Crucially, however, we do not interpret these results as evidence that estrogen is irrelevant to lordosis control, nor as a failure of conjunctive necessity. Rather, these studies demonstrate that sensory context can transiently compensate for reduced neurohumoral drive, consistent with a threshold-based convergence model. In ARCH × Φ terms, intense or patterned vaginocervical stimulation constitutes a supernormal contextual input (C↑) and/or induces transient elevation of the threshold field (Φ), permitting execution of the archetypal motor pattern despite low or absent circulating ovarian steroids (D↓). Importantly, these effects are typically transient, state-dependent, and do not reproduce the full duration, intensity, or stability of hormonally primed receptivity, as also noted in the cited literature. I have therefore revised Section 4.9 (Falsifiability) and related passages to remove the incorrect claim that estrogen absence alone would falsify the model. The falsification criterion has been narrowed appropriately: the framework would be challenged only if robust, sustained lordosis were demonstrated under physiological conditions following complete elimination of neurohumoral drive without compensatory elevation of contextual input or threshold state. This distinction now explicitly incorporates the Komisaruk/Rodriguez-Sierra findings as boundary-condition tests rather than counterexamples. I have also added explicit citations to the three papers identified by the reviewer and expanded the discussion of sensory-induced lordosis to acknowledge their contributions and formally integrate their findings into the ARCH × Φ logic. In doing so, the model becomes more accurate and more empirically grounded, rather than weakened. Regarding the reviewer’s broader concerns about clarity, study design, and support for conclusions: we note that this work is explicitly a theoretical and quantitative synthesis rather than a primary experimental report. In the revised version, we have strengthened methodological transparency by (i) adding a quantitative reanalysis of published lordosis quotient data (Hardy & DeBold, 1971), (ii) providing explicit model comparison procedures and goodness-of-fit metrics, and (iii) clarifying the operationalization of latent variables (A, D, C, Φ) and their falsifiability. These additions directly address concerns about rigor, reproducibility, and empirical support. In summary, I thank the reviewer for identifying a necessary correction. The revised manuscript now accurately reflects the literature, incorporates the key Komisaruk/Rodriguez-Sierra findings as critical empirical constraints, and presents a more precise and defensible formulation of conjunctive, threshold-governed control of lordosis expression. It is also an honor to be reviewed by one of the "founding fathers" in the field. Competing Interests: No competing interests were disclosed. Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and ... Continue reading Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and hindquarter input that directly releases the lordosis fixed action pattern. VCS is a visceral input that modulates excitability—producing immobilization, analgesia, and transient stress—but does not initiate the reflex. It therefore enhances, rather than defines, the C variable (Mani et al., 1997; Blaustein & Erskine, 2002). Komisaruk and colleagues showed that VCS paired with flank pressure can elicit lordosis in hormonally experienced rats, but only after estradiol-dependent neural plasticity has been established (Komisaruk & Diakow, 1973; Micevych et al., 2009). Estradiol induces lasting synaptic and receptor changes in the VMH–PAG–spinal pathway (e.g., progesterone receptor insertion, β-endorphin modulation) that persist after hormone withdrawal (Micevych et al., 2009; Blaustein & Micevych, 2009). Thus, this behavior represents reactivation of an estrogen-sensitized circuit by convergent sensory input. Lordosis never occurs in prepubertal or hormonally naïve females, even with intense flank or VCS stimulation (Erskine, 1985; Powers, 1970). Pubertal estradiol exposure is essential for organizing hypothalamic and spinal circuitry; animals ovariectomized before puberty fail to respond to adult hormone replacement (Pfaff, 1980; Beach, 1981). Mechanical stimulation in such rats produces only escape or immobility (Hardy & DeBold, 1972). This is an important part of the ARCH model which I should include. Even after ovariectomy, low estrogen levels persist through adrenal and neural steroidogenesis (Zarrow et al., 1969; Roselli et al., 1984), maintaining subthreshold receptor activation. Hence, “hormone-independent” lordosis likely occurs under minimal but active estrogenic tone rather than steroid absence (Pfaff, 1980; Blaustein & Micevych, 2009). Within the ARCH × Φ model, the Komisaruk paradigm reflects an intact circuit (A = 1), residual hormonal drive (D ≈ 0.5), a " supernormal stimuli " sensory context (C > 1), and heightened neuromodulatory tone (Φ ≈ 2). Behavior crosses threshold primarily due to amplified sensory and arousal inputs, exemplifying a supernormal releasing mechanism acting on a hormonally conditioned system (Komisaruk & Diakow, 1973; Tinbergen, 1951). This paper should be revised with the above information for clarity. Blaustein, J. D., & Micevych, P. E. (2009). Estrogen receptor signaling in brain: A framework for the regulation of neuroendocrine and behavioral processes. Frontiers in Neuroendocrinology, 30 (2), 173–179. Pfaff, D. W. (1980). Estrogen and brain function: Neural analysis of a hormone-controlled mammalian reproductive behavior. Physiology of Reproduction. Raven Press, New York , 1 , 1517-1519. Powers, J. B. (1970). Hormonal control of sexual receptivity during the estrous cycle of the rat. Physiology & Behavior , 5 (8), 831-835. Roselli, C. E., & Resko, J. A. (1993). Aromatase activity in the rat brain: hormonal regulation and sex differences. The Journal of steroid biochemistry and molecular biology , 44 (4-6), 499-508. Tinbergen, N. (1951). The study of instinct. Oxford: Clarendon Press. Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and hindquarter input that directly releases the lordosis fixed action pattern. VCS is a visceral input that modulates excitability—producing immobilization, analgesia, and transient stress—but does not initiate the reflex. It therefore enhances, rather than defines, the C variable (Mani et al., 1997; Blaustein & Erskine, 2002). Komisaruk and colleagues showed that VCS paired with flank pressure can elicit lordosis in hormonally experienced rats, but only after estradiol-dependent neural plasticity has been established (Komisaruk & Diakow, 1973; Micevych et al., 2009). Estradiol induces lasting synaptic and receptor changes in the VMH–PAG–spinal pathway (e.g., progesterone receptor insertion, β-endorphin modulation) that persist after hormone withdrawal (Micevych et al., 2009; Blaustein & Micevych, 2009). Thus, this behavior represents reactivation of an estrogen-sensitized circuit by convergent sensory input. Lordosis never occurs in prepubertal or hormonally naïve females, even with intense flank or VCS stimulation (Erskine, 1985; Powers, 1970). Pubertal estradiol exposure is essential for organizing hypothalamic and spinal circuitry; animals ovariectomized before puberty fail to respond to adult hormone replacement (Pfaff, 1980; Beach, 1981). Mechanical stimulation in such rats produces only escape or immobility (Hardy & DeBold, 1972). This is an important part of the ARCH model which I should include. Even after ovariectomy, low estrogen levels persist through adrenal and neural steroidogenesis (Zarrow et al., 1969; Roselli et al., 1984), maintaining subthreshold receptor activation. Hence, “hormone-independent” lordosis likely occurs under minimal but active estrogenic tone rather than steroid absence (Pfaff, 1980; Blaustein & Micevych, 2009). Within the ARCH × Φ model, the Komisaruk paradigm reflects an intact circuit (A = 1), residual hormonal drive (D ≈ 0.5), a " supernormal stimuli " sensory context (C > 1), and heightened neuromodulatory tone (Φ ≈ 2). Behavior crosses threshold primarily due to amplified sensory and arousal inputs, exemplifying a supernormal releasing mechanism acting on a hormonally conditioned system (Komisaruk & Diakow, 1973; Tinbergen, 1951). This paper should be revised with the above information for clarity. Blaustein, J. D., & Micevych, P. E. (2009). Estrogen receptor signaling in brain: A framework for the regulation of neuroendocrine and behavioral processes. Frontiers in Neuroendocrinology, 30 (2), 173–179. Pfaff, D. W. (1980). Estrogen and brain function: Neural analysis of a hormone-controlled mammalian reproductive behavior. Physiology of Reproduction. Raven Press, New York , 1 , 1517-1519. Powers, J. B. (1970). Hormonal control of sexual receptivity during the estrous cycle of the rat. Physiology & Behavior , 5 (8), 831-835. Roselli, C. E., & Resko, J. A. (1993). Aromatase activity in the rat brain: hormonal regulation and sex differences. The Journal of steroid biochemistry and molecular biology , 44 (4-6), 499-508. Tinbergen, N. (1951). The study of instinct. Oxford: Clarendon Press. Competing Interests: N/A Close Report a concern Author Response 02 Feb 2026 Tahir Rahman , Psychiatry, Washington University in St Louis, St. Louis, 63110, USA 02 Feb 2026 Author Response Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I ... Continue reading Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I agree that our original wording overstated the necessity of estrogen for lordosis expression, and we appreciate the opportunity to clarify and correct this point. The reviewer is quite correct that multiple studies demonstrate that lordosis can be elicited in ovariectomized rats in the absence of estradiol and progesterone when specific patterns of sensory stimulation are applied, particularly convergent vaginocervical stimulation combined with flank stimulation (Komisaruk et al., 1973; Rodriguez-Sierra et al., 1975; Rodriguez-Sierra et al., 1977). These findings establish that estrogen is not strictly necessary for activation of the lordosis motor pattern under all conditions, and we have revised the manuscript accordingly. Crucially, however, we do not interpret these results as evidence that estrogen is irrelevant to lordosis control, nor as a failure of conjunctive necessity. Rather, these studies demonstrate that sensory context can transiently compensate for reduced neurohumoral drive, consistent with a threshold-based convergence model. In ARCH × Φ terms, intense or patterned vaginocervical stimulation constitutes a supernormal contextual input (C↑) and/or induces transient elevation of the threshold field (Φ), permitting execution of the archetypal motor pattern despite low or absent circulating ovarian steroids (D↓). Importantly, these effects are typically transient, state-dependent, and do not reproduce the full duration, intensity, or stability of hormonally primed receptivity, as also noted in the cited literature. I have therefore revised Section 4.9 (Falsifiability) and related passages to remove the incorrect claim that estrogen absence alone would falsify the model. The falsification criterion has been narrowed appropriately: the framework would be challenged only if robust, sustained lordosis were demonstrated under physiological conditions following complete elimination of neurohumoral drive without compensatory elevation of contextual input or threshold state. This distinction now explicitly incorporates the Komisaruk/Rodriguez-Sierra findings as boundary-condition tests rather than counterexamples. I have also added explicit citations to the three papers identified by the reviewer and expanded the discussion of sensory-induced lordosis to acknowledge their contributions and formally integrate their findings into the ARCH × Φ logic. In doing so, the model becomes more accurate and more empirically grounded, rather than weakened. Regarding the reviewer’s broader concerns about clarity, study design, and support for conclusions: we note that this work is explicitly a theoretical and quantitative synthesis rather than a primary experimental report. In the revised version, we have strengthened methodological transparency by (i) adding a quantitative reanalysis of published lordosis quotient data (Hardy & DeBold, 1971), (ii) providing explicit model comparison procedures and goodness-of-fit metrics, and (iii) clarifying the operationalization of latent variables (A, D, C, Φ) and their falsifiability. These additions directly address concerns about rigor, reproducibility, and empirical support. In summary, I thank the reviewer for identifying a necessary correction. The revised manuscript now accurately reflects the literature, incorporates the key Komisaruk/Rodriguez-Sierra findings as critical empirical constraints, and presents a more precise and defensible formulation of conjunctive, threshold-governed control of lordosis expression. It is also an honor to be reviewed by one of the "founding fathers" in the field. Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I agree that our original wording overstated the necessity of estrogen for lordosis expression, and we appreciate the opportunity to clarify and correct this point. The reviewer is quite correct that multiple studies demonstrate that lordosis can be elicited in ovariectomized rats in the absence of estradiol and progesterone when specific patterns of sensory stimulation are applied, particularly convergent vaginocervical stimulation combined with flank stimulation (Komisaruk et al., 1973; Rodriguez-Sierra et al., 1975; Rodriguez-Sierra et al., 1977). These findings establish that estrogen is not strictly necessary for activation of the lordosis motor pattern under all conditions, and we have revised the manuscript accordingly. Crucially, however, we do not interpret these results as evidence that estrogen is irrelevant to lordosis control, nor as a failure of conjunctive necessity. Rather, these studies demonstrate that sensory context can transiently compensate for reduced neurohumoral drive, consistent with a threshold-based convergence model. In ARCH × Φ terms, intense or patterned vaginocervical stimulation constitutes a supernormal contextual input (C↑) and/or induces transient elevation of the threshold field (Φ), permitting execution of the archetypal motor pattern despite low or absent circulating ovarian steroids (D↓). Importantly, these effects are typically transient, state-dependent, and do not reproduce the full duration, intensity, or stability of hormonally primed receptivity, as also noted in the cited literature. I have therefore revised Section 4.9 (Falsifiability) and related passages to remove the incorrect claim that estrogen absence alone would falsify the model. The falsification criterion has been narrowed appropriately: the framework would be challenged only if robust, sustained lordosis were demonstrated under physiological conditions following complete elimination of neurohumoral drive without compensatory elevation of contextual input or threshold state. This distinction now explicitly incorporates the Komisaruk/Rodriguez-Sierra findings as boundary-condition tests rather than counterexamples. I have also added explicit citations to the three papers identified by the reviewer and expanded the discussion of sensory-induced lordosis to acknowledge their contributions and formally integrate their findings into the ARCH × Φ logic. In doing so, the model becomes more accurate and more empirically grounded, rather than weakened. Regarding the reviewer’s broader concerns about clarity, study design, and support for conclusions: we note that this work is explicitly a theoretical and quantitative synthesis rather than a primary experimental report. In the revised version, we have strengthened methodological transparency by (i) adding a quantitative reanalysis of published lordosis quotient data (Hardy & DeBold, 1971), (ii) providing explicit model comparison procedures and goodness-of-fit metrics, and (iii) clarifying the operationalization of latent variables (A, D, C, Φ) and their falsifiability. These additions directly address concerns about rigor, reproducibility, and empirical support. In summary, I thank the reviewer for identifying a necessary correction. The revised manuscript now accurately reflects the literature, incorporates the key Komisaruk/Rodriguez-Sierra findings as critical empirical constraints, and presents a more precise and defensible formulation of conjunctive, threshold-governed control of lordosis expression. It is also an honor to be reviewed by one of the "founding fathers" in the field. Competing Interests: No competing interests were disclosed. Close Report a concern COMMENT ON THIS REPORT Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 18 Sep 2025 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 2 (revision) 02 Feb 26 Version 1 18 Sep 25 read read Barry Komisaruk , rutgers university, Newark, USA Thatiane De Oliveira Sergio , Indiana University School of Medicine (IUSOM), Indianapolis, USA Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2026 Sergio T. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 29 Dec 2025 | for Version 1 Thatiane De Oliveira Sergio , Indiana University School of Medicine (IUSOM), Indianapolis, USA 0 Views copyright © 2026 Sergio T. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (1) Not Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The author presents a theoretical synthesis proposing a formal, multiplicative "law of convergence" for behavioral expression, using the lordosis reflex in female rats as a model system. The proposed ARCH × Φ framework posits that Behavior = Φ(A × D × C), where A (Archetype/neural substrate), D (Drive/hormonal priming), and C (Context/sensory input) are conjunctively necessary, and Φ is a modulatory threshold field (arousal, stress). The manuscript reviews decades of classic neuroendocrinology literature to argue that lesion (VMH), hormone deprivation (ovariectomy), and sensory removal (flank denervation) studies each independently abolish lordosis, supporting a multiplicative (1×1×0=0) rather than additive model. The author contends this reframing moves the field from qualitative description to a predictive, falsifiable, and potentially generalizable quantitative principle. The manuscript addresses a significant and often-overlooked conceptual gap: the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior. The core insight that classic findings in lordosis research exemplify a conjunctive logic is compelling and intellectually valuable. The writing is clear, and the historical framing (Lewin, Tinbergen) is appropriate. However, in its current form, the manuscript presents a compelling re-description of existing knowledge more than a novel theoretical advance or a rigorously tested model. The claim of a new "law" is overstated without stronger empirical validation or a more critical engagement with the complexities and exceptions in the literature. Thus, to be considered a significant theoretical advance suitable for Indexing in a competitive journal, it requires substantial revision to moderate its claims, deepen its engagement with the complexity of the data, and demonstrate the predictive, quantitative utility of the proposed framework beyond elegant re-description. Is the work clearly and accurately presented and does it cite the current literature? Partly Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Partly If applicable, is the statistical analysis and its interpretation appropriate? Partly Are all the source data underlying the results available to ensure full reproducibility? Partly Are the conclusions drawn adequately supported by the results? Partly Competing Interests No competing interests were disclosed. Reviewer Expertise Behavioral Pharmacology I confirm that I have read this submission and believe that I have an appropriate level of expertise to state that I do not consider it to be of an acceptable scientific standard, for reasons outlined above. reply Respond to this report Responses (1) Author Response 02 Feb 2026 Tahir Rahman, Psychiatry, Washington University in St Louis, St. Louis, 63110, USA Response to Reviewer 2 I thank Reviewer 2 for the careful and balanced evaluation of the manuscript. We appreciate the recognition that the ARCH × Φ framework addresses a significant conceptual gap—namely, the lack of a formal, testable specification for how multiple necessary factors combine to produce behavior—and we agree with the reviewer that the initial version risked being read as an elegant re-description rather than a substantive theoretical advance. I have therefore made substantial revisions to moderate claims, deepen engagement with the literature's complexity, and strengthen the empirical and quantitative grounding of the framework. First, I have revised the framing of novelty and scope. The manuscript no longer proposes a “law” of behavioral convergence. Instead, ARCH × Φ is explicitly presented as a candidate, falsifiable principle whose validity depends on empirical testing. This change directly addresses the reviewer’s concern about overstated claims and aligns the work more closely with the standards for theoretical synthesis. Second, we have added explicit quantitative validation. A new Results subsection now includes a quantitative reanalysis of classic lordosis dose–response data from Hardy and DeBold (1971). Using normalized lordosis quotient data, I fit and compare additive, threshold-linear, and multiplicative threshold models. Model comparison using information criteria demonstrates that the multiplicative threshold formulation captures sharp transitions and probability–magnitude dissociations that additive alternatives fail to explain. This analysis moves the framework beyond qualitative re-description to demonstrable quantitative discrimination. Third, I have expanded methodological transparency and reproducibility. Appendix C now provides a detailed, step-by-step quantitative workflow describing data normalization, model specification, fitting procedures, and model comparison metrics. While the paper does not introduce new primary data, all analyses are reproducible from published datasets, and the methods are explicitly documented. Fourth, I have engaged more critically with the literature's complexity and exceptions. The revised manuscript incorporates sensory-induced lordosis in ovariectomized animals (e.g., Komisaruk and colleagues) as boundary-condition cases rather than counterexamples, clarifying how intense contextual input or threshold modulation can transiently compensate for reduced drive without violating conjunctive necessity. This strengthens the model by integrating, rather than excluding, apparent exceptions. Finally, I have sharpened the predictive and falsifiable content. The revised Falsifiability section now specifies concrete factorial designs and model-comparison criteria that could empirically disconfirm the multiplicative veto structure, addressing the reviewer’s concern that predictive utility be demonstrated rather than asserted. In summary, I have substantially revised the manuscript to move it from a primarily conceptual synthesis toward a quantitatively anchored, empirically constrained, and explicitly falsifiable theoretical framework. I am grateful to Reviewer 2 for identifying the key areas requiring strengthening, and I now believe the revised version more fully meets the standards for a significant theoretical contribution. View more View less Competing Interests No competing interests were disclosed. reply Respond Report a concern Sergio TDO. Peer Review Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r437873) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-437873 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Komisaruk B. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 10 Nov 2025 | for Version 1 Barry Komisaruk , Psychology, rutgers university, Newark, New Jersey, USA 0 Views copyright © 2025 Komisaruk B. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (2) Not Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions There is a fundamental flaw in the author's multiple assertions throughout the manuscript that estrogen is necessary for lordosis to be elicited...it is not! It appears the author is not aware of, or is discounting, existing evidence that refutes a major assertion in his concept; as the evidence in the attached literature shows, contrary to the author's assertion, estrogen is, in fact, NOT required for lordosis. Thus, the neural circuits for lordosis are still functional in the absence of estrogen, evidence that estrogen is a sufficient but not necessary condition for lordosis. The vaginocervical probing alone produces immobilization (and potent analgesia) but not lordosis, but at the moment when flank stimulation is then added to the vaginocervical probing, strikingly, the lordosis response occurs immediately. The author should refer to the 3 attached papers: (KOMISARUK, et al., 1973) - Ref 1; (Rodriguez-Sierra, et al., 1977) - Ref 2; (Rodriguez-Sierra, et al., 1975) - Ref 3, that demonstrate that the neural system for lordosis can be activated in the absence of estrogen and progesterone, in relation to the statement in the present manuscript in Section 4.9: "The model is therefore refutable in specific ways. If future experiments were to show that lordosis can be robustly expressed without an intact VMH circuit, in the complete absence of estradiol and progesterone, or without flank stimulation, the current framework would be falsified." Is the work clearly and accurately presented and does it cite the current literature? No Is the study design appropriate and is the work technically sound? No Are sufficient details of methods and analysis provided to allow replication by others? Partly If applicable, is the statistical analysis and its interpretation appropriate? Not applicable Are all the source data underlying the results available to ensure full reproducibility? No Are the conclusions drawn adequately supported by the results? No References 1. KOMISARUK B, DIAKOW C: Lordosis Reflex Intensity in Rats in Relation to the Estrous Cycle, Ovariectomy, Estrogen Administration and Mating Behavior. Endocrinology . 1973; 93 (3): 548-557 Publisher Full Text 2. Rodriguez-Sierra J, Crowley W, Komisaruk B: Induction of lordosis responsiveness by vaginal stimulation in rats is independent of anterior or posterior pituitary hormones. Hormones and Behavior . 1977; 8 (3): 348-355 Publisher Full Text 3. Rodriguez-Sierra J, Crowley W, Komisaruk B: Vaginal stimulation in rats induces prolonged lordosis responsiveness and sexual receptivity. Journal of Comparative and Physiological Psychology . 1975; 89 (1): 79-85 Publisher Full Text Competing Interests No competing interests were disclosed. Reviewer Expertise Neuroendocrinology of sexual behavior I confirm that I have read this submission and believe that I have an appropriate level of expertise to state that I do not consider it to be of an acceptable scientific standard, for reasons outlined above. reply Respond to this report Responses (2) Author Response 02 Feb 2026 Tahir Rahman, Psychiatry, Washington University in St Louis, St. Louis, 63110, USA Thank you for raising these points. The reviewer equates vaginocervical stimulation (VCS) with the “Context” (C) variable in the ARCH × Φ model, but C refers to exteroceptive flank and hindquarter input that directly releases the lordosis fixed action pattern. VCS is a visceral input that modulates excitability—producing immobilization, analgesia, and transient stress—but does not initiate the reflex. It therefore enhances, rather than defines, the C variable (Mani et al., 1997; Blaustein & Erskine, 2002). Komisaruk and colleagues showed that VCS paired with flank pressure can elicit lordosis in hormonally experienced rats, but only after estradiol-dependent neural plasticity has been established (Komisaruk & Diakow, 1973; Micevych et al., 2009). Estradiol induces lasting synaptic and receptor changes in the VMH–PAG–spinal pathway (e.g., progesterone receptor insertion, β-endorphin modulation) that persist after hormone withdrawal (Micevych et al., 2009; Blaustein & Micevych, 2009). Thus, this behavior represents reactivation of an estrogen-sensitized circuit by convergent sensory input. Lordosis never occurs in prepubertal or hormonally naïve females, even with intense flank or VCS stimulation (Erskine, 1985; Powers, 1970). Pubertal estradiol exposure is essential for organizing hypothalamic and spinal circuitry; animals ovariectomized before puberty fail to respond to adult hormone replacement (Pfaff, 1980; Beach, 1981). Mechanical stimulation in such rats produces only escape or immobility (Hardy & DeBold, 1972). This is an important part of the ARCH model which I should include. Even after ovariectomy, low estrogen levels persist through adrenal and neural steroidogenesis (Zarrow et al., 1969; Roselli et al., 1984), maintaining subthreshold receptor activation. Hence, “hormone-independent” lordosis likely occurs under minimal but active estrogenic tone rather than steroid absence (Pfaff, 1980; Blaustein & Micevych, 2009). Within the ARCH × Φ model, the Komisaruk paradigm reflects an intact circuit (A = 1), residual hormonal drive (D ≈ 0.5), a " supernormal stimuli " sensory context (C > 1), and heightened neuromodulatory tone (Φ ≈ 2). Behavior crosses threshold primarily due to amplified sensory and arousal inputs, exemplifying a supernormal releasing mechanism acting on a hormonally conditioned system (Komisaruk & Diakow, 1973; Tinbergen, 1951). This paper should be revised with the above information for clarity. Blaustein, J. D., & Micevych, P. E. (2009). Estrogen receptor signaling in brain: A framework for the regulation of neuroendocrine and behavioral processes. Frontiers in Neuroendocrinology, 30 (2), 173–179. Pfaff, D. W. (1980). Estrogen and brain function: Neural analysis of a hormone-controlled mammalian reproductive behavior. Physiology of Reproduction. Raven Press, New York , 1 , 1517-1519. Powers, J. B. (1970). Hormonal control of sexual receptivity during the estrous cycle of the rat. Physiology & Behavior , 5 (8), 831-835. Roselli, C. E., & Resko, J. A. (1993). Aromatase activity in the rat brain: hormonal regulation and sex differences. The Journal of steroid biochemistry and molecular biology , 44 (4-6), 499-508. Tinbergen, N. (1951). The study of instinct. Oxford: Clarendon Press. View more View less Competing Interests N/A reply Respond Report a concern Author Response 02 Feb 2026 Tahir Rahman, Psychiatry, Washington University in St Louis, St. Louis, 63110, USA Response to Reviewer 1 I thank the reviewer for this essential and detailed critique and for drawing attention to the seminal work by Komisaruk and colleagues (1973; 1975; 1977). I agree that our original wording overstated the necessity of estrogen for lordosis expression, and we appreciate the opportunity to clarify and correct this point. The reviewer is quite correct that multiple studies demonstrate that lordosis can be elicited in ovariectomized rats in the absence of estradiol and progesterone when specific patterns of sensory stimulation are applied, particularly convergent vaginocervical stimulation combined with flank stimulation (Komisaruk et al., 1973; Rodriguez-Sierra et al., 1975; Rodriguez-Sierra et al., 1977). These findings establish that estrogen is not strictly necessary for activation of the lordosis motor pattern under all conditions, and we have revised the manuscript accordingly. Crucially, however, we do not interpret these results as evidence that estrogen is irrelevant to lordosis control, nor as a failure of conjunctive necessity. Rather, these studies demonstrate that sensory context can transiently compensate for reduced neurohumoral drive, consistent with a threshold-based convergence model. In ARCH × Φ terms, intense or patterned vaginocervical stimulation constitutes a supernormal contextual input (C↑) and/or induces transient elevation of the threshold field (Φ), permitting execution of the archetypal motor pattern despite low or absent circulating ovarian steroids (D↓). Importantly, these effects are typically transient, state-dependent, and do not reproduce the full duration, intensity, or stability of hormonally primed receptivity, as also noted in the cited literature. I have therefore revised Section 4.9 (Falsifiability) and related passages to remove the incorrect claim that estrogen absence alone would falsify the model. The falsification criterion has been narrowed appropriately: the framework would be challenged only if robust, sustained lordosis were demonstrated under physiological conditions following complete elimination of neurohumoral drive without compensatory elevation of contextual input or threshold state. This distinction now explicitly incorporates the Komisaruk/Rodriguez-Sierra findings as boundary-condition tests rather than counterexamples. I have also added explicit citations to the three papers identified by the reviewer and expanded the discussion of sensory-induced lordosis to acknowledge their contributions and formally integrate their findings into the ARCH × Φ logic. In doing so, the model becomes more accurate and more empirically grounded, rather than weakened. Regarding the reviewer’s broader concerns about clarity, study design, and support for conclusions: we note that this work is explicitly a theoretical and quantitative synthesis rather than a primary experimental report. In the revised version, we have strengthened methodological transparency by (i) adding a quantitative reanalysis of published lordosis quotient data (Hardy & DeBold, 1971), (ii) providing explicit model comparison procedures and goodness-of-fit metrics, and (iii) clarifying the operationalization of latent variables (A, D, C, Φ) and their falsifiability. These additions directly address concerns about rigor, reproducibility, and empirical support. In summary, I thank the reviewer for identifying a necessary correction. The revised manuscript now accurately reflects the literature, incorporates the key Komisaruk/Rodriguez-Sierra findings as critical empirical constraints, and presents a more precise and defensible formulation of conjunctive, threshold-governed control of lordosis expression. It is also an honor to be reviewed by one of the "founding fathers" in the field. View more View less Competing Interests No competing interests were disclosed. reply Respond Report a concern Komisaruk B. Peer Review Report For: Lordosis as a Conjunctive Reflex: Testing the ARCH × Φ Model of Behavioral Expression [version 1; peer review: 2 not approved] . F1000Research 2025, 14 :939 ( https://doi.org/10.5256/f1000research.187384.r416428) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/14-939/v1#referee-response-416428 Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions Adjust parameters to alter display View on desktop for interactive features Includes Interactive Elements View on desktop for interactive features Competing Interests Policy Provide sufficient details of any financial or non-financial competing interests to enable users to assess whether your comments might lead a reasonable person to question your impartiality. 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