A Theoretical Framework for Dopaminergic Adaptation and Civilizational Homeostasis: Explaining Motivation, Fertility, and the Rise and Fall of Civilizations

Across advanced societies, motivation and fertility have declined despite unprecedented material abundance (Roser, 2014; Colleran, 2016; Aitken, 2024). Traditional explanations, such as economic pressure, education, gender equality, and shifting social values, describe these outcomes but fail to explain the deeper regulatory mechanism linking individual neurobiology with civilizational behavior. Neuroscientific evidence shows that dopamine regulates both reward anticipation and behavioral persistence, functioning as the brain’s contrast-detection mechanism for motivation and satisfaction (Schultz, 1997; Berridge & Robinson, 2016; Dresp-Langley, 2023). This paper proposes a unifying model—the Theory of Evolutionary Homeostasis (THE), which links dopaminergic adaptation to civilizational cycles of motivation, fertility, and renewal. For convenience and clarity in future reference, this framework is hereafter referred to as Chois’ Theory of Evolutionary Homeostasis (CTEH).The framework identifies eight interlocking tenets: Relativity of Abundance, Dopaminergic Adaptation, Substitution Principle, Homeostatic Drift, Environmental Relativity of Intelligence and Fitness, Collapse and Recalibration, Cyclical Renewal, and Nested Homeostasis. Together, these describe how abundance elevates the dopamine baseline, dulling reward sensitivity and shifting behavior toward artificial stimulation rather than effort-based reward (Brickman & Campbell, 1971; Lyubomirsky, 2008). When desensitization spreads across individuals and institutions, social cohesion and fertility decline (Lutz & Kc, 2011). Periods of crisis then restore contrast and recalibrate the system, initiating renewed motivation and growth (Turchin, 2016).Integrating neuroscience, psychology, and demography, this model reframes social decline not as moral failure but as a predictable outcome of reward saturation. It provides a unifying explanation for cyclical patterns of prosperity, apathy, and renewal observed throughout history, and suggests that understanding dopaminergic relativity may be essential for designing sustainable technological, psychological, and demographic interventions.