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Early averted gaze processing in the right Fusiform Gyrus: An EEG source imaging study
Cristina Berchio1, Tonia A Rihs1, Camille Piguet2
1Department of Fundamental Neurosciences, University of Geneva, Geneva, Switzerland.
Biological Psychology
|July 7, 2016
Summary
Gaze direction is processed very quickly by the brain, with averted gaze recognized faster than direct gaze. This early brain activity suggests distinct processing for gaze perception versus facial identity.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Social Neuroscience
Background:
- Human face perception involves rapid processing of various features.
- The precise timing and neural basis of gaze recognition remain under investigation.
Purpose of the Study:
- To investigate the brain activity underlying spontaneous and rapid gaze processing using event-related potentials (ERP).
- To explore the differential neural responses to direct versus averted gaze.
- To examine the temporal dynamics of gaze detection in relation to identity processing.
Main Methods:
- High-density electroencephalography (EEG) was used to record event-related potentials (ERP).
- A matching picture paradigm presented neutral faces with direct and averted gaze.
- Participants performed an identity detection task, implicitly manipulating gaze direction.
Main Results:
- Averted gaze faces were better discriminated and elicited stronger early P100 amplitudes in the right fusiform gyrus compared to direct gaze.
- Direct gaze activated the orbital frontal gyrus earlier and the right medial temporal gyrus later (N170 component).
- Differential ERP responses to repeated versus novel faces were observed as early as 50ms.
Conclusions:
- These findings suggest an early neural dissociation between implicit gaze detection and explicit identity processing.
- Differential brain activations indicate that averted gaze may be perceived as less rewarding than direct gaze.
- The study highlights the rapid and distinct neural pathways involved in processing social cues like gaze direction.
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