Cortical and subcortical alpha EEG network involved in the interpersonal space sensitivity

2025 · doi:10.22541/au.175912064.44388646/v1
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This preprint investigated interpersonal space sensitivity (IPSS) using EEG alpha oscillations while participants stood face-to-face and followed auditory instructions to alternately close and open their eyes, with visual gaze prevented by a mask. Alpha power over occipito-parietal regions increased as distance decreased when eyes were closed (transitioning from extra-personal to peri-personal space) and decreased for the same distances when eyes were open; these event-related synchronization/desynchronization effects were absent when participants’ heads were masked. Source modeling localized alpha ERS/ERD to bilateral parietal cortex (BA7) plus several limbic and cingulate regions (BA23, ACC areas BA31/24/32), premotor/supplementary motor and frontal eye field areas (BA6/BA8), along with thalamic and cerebellar recruitment; beta oscillations were not significantly involved and blink rate was not affected. This paper is not explicitly about endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The presence of another human in our immediate or distant environment is a crucial factor for survival and social behavior. Our actions vary depending on the other person’s relative proximity, involving integration of brain functions subserved by neural oscillations, to generate the most appropriate behavior. This study highlights the alpha EEG role and its neural generators in interpersonal space sensitivity (IPSS). To investigate this, participants stood face-to-face, gazing into each other’s eyes, and while wearing a mask preventing them from staring at each other. An auditory order instructed them to alternately close and open their eyes. It was observed that alpha power of occipito-parietal region increased as the distance decreased, transitioning from extra-personal space (4 m) to peri-personal space (<40 cm) when the eyes were closed. Conversely, alpha power decreased for the same distances when the eyes were open. These significant event-related synchronization (ERS) and desynchronization (ERD) effects were absent when participants’ heads were masked. Beta oscillations were not significantly involved in IPSS. The number of spontaneous blinks was not significantly influenced by IPSS. Source modeling identified alpha ERS and ERD in cortical and subcortical generators significantly involved in IPSS with independent components localized in: The parietal cortex bilaterally (BA7), the left limbic gyrus (BA23), the anterior cingulate cortex (ACC) (right BA31, left and right BA24, right BA32), the right premotor cortex (BA6, including the supplementary motor area (SMA), and the right frontal eye fields (BA8). These cortical areas were accompanied by the recruitment of the thalamus and cerebellum.
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Abstract

The presence of another human in our immediate or distant environment is a crucial factor for survival and social behavior. Our actions vary depending on the other person’s relative proximity, involving integration of brain functions subserved by neural oscillations, to generate the most appropriate behavior. This study highlights the alpha EEG role and its neural generators in interpersonal space sensitivity (IPSS). To investigate this, participants stood face-to-face, gazing into each other’s eyes, and while wearing a mask preventing them from staring at each other. An auditory order instructed them to alternately close and open their eyes. It was observed that alpha power of occipito-parietal region increased as the distance decreased, transitioning from extra-personal space (4 m) to peri-personal space (<40 cm) when the eyes were closed. Conversely, alpha power decreased for the same distances when the eyes were open. These significant event-related synchronization (ERS) and desynchronization (ERD) effects were absent when participants’ heads were masked. Beta oscillations were not significantly involved in IPSS. The number of spontaneous blinks was not significantly influenced by IPSS. Source modeling identified alpha ERS and ERD in cortical and subcortical generators significantly involved in IPSS with independent components localized in: The parietal cortex bilaterally (BA7), the left limbic gyrus (BA23), the anterior cingulate cortex (ACC) (right BA31, left and right BA24, right BA32), the right premotor cortex (BA6, including the supplementary motor area (SMA), and the right frontal eye fields (BA8). These cortical areas were accompanied by the recruitment of the thalamus and cerebellum. Information & Authors Information Version history Copyright This work is licensed under a Non Exclusive No Reuse License. Collection

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Authors Metrics & Citations Metrics Article Usage 201views 137downloads Citations Download citation guy cheron, Dominique Ristori, Mathieu Petieau, et al. Cortical and subcortical alpha EEG network involved in the interpersonal space sensitivity. Authorea. 29 September 2025. DOI: https://doi.org/10.22541/au.175912064.44388646/v1 DOI: https://doi.org/10.22541/au.175912064.44388646/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu.

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