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Cortical responses to invisible faces: dissociating subsystems for facial-information processing
1Department of Psychology, University of Minnesota, 75 East River Road, Minneapolis, Minnesota 55455, USA.
Current Biology : CB
|October 24, 2006
Summary
This study reveals distinct brain pathways for facial identity and expression. Invisible fearful faces activate the superior temporal sulcus (STS) and amygdala, suggesting specialized processing.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Social Neuroscience
Background:
- Face perception is crucial for social interaction.
- Distinct neural pathways may process facial identity versus expression.
- Understanding these pathways aids in comprehending social cognition.
Purpose of the Study:
- To investigate the neural correlates of processing facial identity and expression.
- To determine if different brain regions are involved when faces are consciously perceived versus rendered invisible.
- To explore the roles of the fusiform face area (FFA) and superior temporal sulcus (STS) in processing facial information.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
- Participants viewed neutral, fearful, and scrambled faces under visible and invisible conditions (using interocular suppression).
- Brain responses in key areas like the FFA, STS, and amygdala were analyzed.
Main Results:
- Visible faces strongly activated the right FFA, STS, and amygdala.
- Invisible faces showed reduced FFA activity, but robust STS activity for fearful faces.
- The amygdala responded strongly to fearful faces regardless of visibility, correlating with STS activity when faces were invisible.
Conclusions:
- The findings support dissociable neural systems for processing facial identity (FFA) and expression (STS).
- When faces are invisible, brain activity may reflect feed-forward processing, highlighting distinct functional roles of FFA and STS.
- This research provides insights into the neural basis of unconscious facial processing and its implications for social interaction.
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