Cortical responses to self and others.
Amra Hodzic1, Lars Muckli, Wolf Singer
1Department of Neurophysiology, Max Planck Institute for Brain Research, Frankfurt am Main, Germany. hodzic@mpih-frankfurt.mpg.de
Human Brain Mapping
|April 3, 2008
Summary
Researchers used fMRI to study brain activity when viewing one's own body versus others. Distinct brain networks process general body information and self-related body identity.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Visual Perception
Background:
- The human visual cortex has specialized regions, including the extrastriate body area (EBA), that respond to body-related stimuli.
- Understanding how the brain processes self-perception versus perception of others is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate if brain activation patterns differ when perceiving one's own body compared to the bodies of others.
- To identify distinct cortical networks involved in processing general body information and self-specific body identity.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to observe brain activity.
- Participants viewed images of their own body and others' bodies, excluding facial and motion cues.
- Whole-brain analysis and general linear model (GLM) were used to analyze blood oxygen level dependent (BOLD) signals.
Main Results:
- Body-related BOLD signal enhancements were found in multiple right hemisphere regions (extrastriate visual, parietal cortex, precentral gyrus) and one left hemisphere region (extrastriate visual cortex).
- Self-related responses were identified in right extrastriate and parietal regions, and the right middle frontal gyrus.
- The extrastriate body area (EBA) processes general body information, while a separate network (including fusiform body area, parietal regions, and middle frontal gyrus) handles body identity assignment.
Conclusions:
- Two distinct cortical networks exist: one for general body information extraction and another for self-related body information.
- These networks partially overlap in the right parietal cortex but are segregated in the extrastriate visual cortex and middle frontal gyrus.
- The EBA is not involved in assigning body identity, which is managed by a distinct right-hemisphere network.
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