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Updated: May 10, 2026
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How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging
Published on: June 3, 2013
Amygdala activation for eye contact despite complete cortical blindness
Nicolas Burra1, Alexis Hervais-Adelman, Dirk Kerzel
1Faculty of Psychology and Educational Science, University of Geneva, CH-1211 Geneva, Switzerland.
Summary
Cortically blind patients can process directed gaze, showing amygdala activation without a functional visual cortex. This suggests the amygdala responds to eye contact independently of primary visual processing.
Area of Science:
- Neuroscience
- Visual processing
- Social cognition
Background:
- Cortical blindness results from primary visual cortex destruction, eliminating conscious vision.
- Some cortically blind individuals exhibit amygdala activation to emotional expressions, indicating non-visual processing pathways.
- The capacity for processing gaze direction in the absence of visual cortex function remained unexplored.
Observation:
- A patient with bilateral visual cortex destruction (cortical blindness) was studied using fMRI.
- Facial stimuli were presented with either directed (toward viewer) or averted gaze.
- Brain activity was measured during the presentation of these stimuli.
Findings:
- The right amygdala showed increased activation in response to directed gaze compared to averted gaze.
- This amygdala activation was functionally connected to brain networks involved in face and gaze processing.
- These results indicate that amygdala responses to eye contact do not necessitate an intact primary visual cortex.
Implications:
- The amygdala can process socially relevant visual cues like eye contact, even without conscious visual perception.
- This highlights parallel processing pathways for social information in the brain.
- Understanding these pathways is crucial for patients with visual cortex damage and for broader theories of social neuroscience.
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