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Updated: Jul 10, 2026
12:51
Investigating the Neural Mechanisms of Aware and Unaware Fear Memory with fMRI
Published on: October 6, 2011
ERPs reveal subliminal processing of fearful faces
1School of Psychology, Birkbeck College, University of London, London, UK. m.kiss@bbk.ac.uk
Psychophysiology
|November 13, 2007
Summary
Even when unaware, the brain processes facial expressions. Event-related potentials (ERPs) show rapid fear detection in masked faces, demonstrating subconscious emotional perception.
Area of Science:
- Cognitive Neuroscience
- Social Psychology
- Neuroscience
Background:
- Facial expressions convey crucial social information.
- Understanding if emotional stimuli are processed without conscious awareness is key to understanding perception.
Purpose of the Study:
- To investigate the processing of facial expressions, specifically fear, during unconscious perception.
- To determine if the brain differentiates fearful from neutral faces without conscious awareness.
Main Methods:
- Event-related potentials (ERPs) were recorded while participants viewed masked fearful and neutral faces.
- Stimuli were presented supraliminally (200 ms) and subliminally (8 ms).
- Participants performed an identification task.
Main Results:
- Supraliminal presentation showed sustained positivity for fearful faces starting at 140 ms.
- Subliminal presentation revealed early positivity and enhanced N2 for fearful faces, despite chance-level identification.
- P3 enhancement was observed for supraliminal but not subliminal fearful faces.
Conclusions:
- The brain rapidly processes emotional facial expressions, like fear, even without conscious awareness.
- Distinct neural signatures differentiate fearful from neutral faces under both conscious and unconscious conditions.
- These findings highlight the efficiency of early emotional processing in the human brain.
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