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The Time Course of Face Representations during Perception and Working Memory Maintenance
1Department of Psychology, Arizona State University, Tempe, AZ 85287, USA.
Cerebral Cortex Communications
|July 23, 2021
Summary
Face identity and expression are processed differently over time. While identity is perceived faster, facial expression is better maintained in working memory (WM) using distinct neural mechanisms.
Area of Science:
- Cognitive Neuroscience
- Social Psychology
- Neuroscience
Background:
- Social communication relies on processing both unchanging face identity and changeable facial expressions.
- Understanding the temporal dynamics of face perception and working memory (WM) maintenance is crucial but less explored.
Purpose of the Study:
- To investigate the temporal evolution of face identity and expression information during perception and WM maintenance.
- To explore the neural mechanisms underlying the differential processing of these facial features over time.
Main Methods:
- Electroencephalography (EEG) was used to record brain activity.
- Participants performed a face working memory task, recalling either identity or expression.
- Multivariate event-related potential (ERP) decoding analyses were applied to EEG data.
Main Results:
- Face identity information was decoded more effectively during perception than facial expression.
- Facial expression information was decoded better than face identity during WM maintenance.
- Differential maintenance mechanisms were observed, with identity information stored more "activity-silent" than expression.
Conclusions:
- Face identity and expression information exhibit distinct temporal dynamics during perception and working memory.
- These findings suggest different neural strategies for maintaining invariant (identity) versus variant (expression) facial information.
- The study provides insights into the temporal processing and neural basis of face information in cognitive tasks.
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