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Interdigitated Columnar Representation of Personal Space and Visual Space in Human Parietal Cortex
Roger B H Tootell1,2,3, Zahra Nasiriavanaki4,5, Baktash Babadi4,5
1Harvard Medical School, Boston, Massachusetts 02115 tootell@mgh.harvard.edu.
Summary
Brain imaging reveals how the parietal cortex processes personal space. Two distinct sets of columns encode visual distance and interpersonal distance, transforming sensory information into a body-centered map.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Social Neuroscience
Background:
- Personal space (PS) is the preferred buffer zone around an individual, crucial for comfortable social interaction.
- Intrusion into personal space triggers discomfort and avoidance behaviors.
- Previous research in primates linked parietal cortex to defensive responses against stimuli intruding into personal space.
Purpose of the Study:
- To investigate the spatial encoding of interpersonal distance within the human parietal cortex.
- To test the hypothesis that sensory spatial information is transformed into an egocentric (body-centered) map in the parietal cortex.
- To elucidate the neural mechanisms underlying personal space regulation using high-resolution functional magnetic resonance imaging (fMRI).
Main Methods:
- Utilized 7 Tesla (7T) fMRI with high spatial resolution (1.1 mm isotropic) to scan seven human subjects.
- Presented visual stimuli at various virtual distances to participants.
- Analyzed brain activity in the parietal cortex, specifically looking for distinct patterns of neural responses to different types of spatial information.
Main Results:
- Identified two distinct, radially-extending columns of activity in the parietal cortex: P columns and D columns.
- P columns selectively responded to faces at distances within the individual's personal space boundary, showing varied responses to proximity.
- D columns responded to visual distance cues in random dot stimuli, demonstrating segregation from P columns.
Conclusions:
- The human parietal cortex transforms visual spatial information into body-centered (egocentric) representations.
- This transformation involves distinct, interdigitated neural columns: one for interpersonal distance (P columns) and one for visual distance (D columns).
- Short-range communication between these segregated columns likely underlies the neural processing of personal space and near-body spatial awareness.
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