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Gaze Direction Modulates the Relation between Neural Responses to Faces and Visual Awareness.

Apoorva Rajiv Madipakkam1, Marcus Rothkirch2, Matthias Guggenmos3

  • 1Department of Psychiatry, International Graduate Program Medical Neurosciences, and Berlin Center for Advanced Neuroimaging, Charité, Universitätsmedizin Berlin, 10117 Berlin, Germany, and apoorva-rajiv.madipakkam@charite.de.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 2, 2015
PubMed
Summary
This summary is machine-generated.

Direct gaze gains privileged access to visual awareness. Lower neural activity in the fusiform face area (FFA) is sufficient for direct gaze to enter awareness compared to averted gaze.

Keywords:
CFSconsciousnessface processinggaze direction

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Area of Science:

  • Neuroscience
  • Social Cognition
  • Visual Perception

Background:

  • Direct gaze is a potent nonverbal cue crucial for social interactions.
  • Understanding the neural basis of how direct gaze gains preferential access to awareness is key.

Purpose of the Study:

  • To investigate the neural mechanisms behind the privileged access of direct gaze to visual awareness.
  • To determine how gaze direction modulates neural responses related to conscious perception.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) in healthy volunteers.
  • Continuous flash suppression (CFS) to manipulate awareness of faces with direct or averted gaze.
  • Analysis of neural responses in key brain regions, including the fusiform face area (FFA).

Main Results:

  • Gaze processing network showed reduced responses when faces were not consciously perceived.
  • Direct gaze elicited stronger responses than averted gaze when participants were aware.
  • Direct gaze elicited weaker responses than averted gaze when participants were unaware.
  • Increased neural activation in the FFA correlated with faster awareness of direct-gaze faces.

Conclusions:

  • Neural activity in the FFA modulates the relationship between gaze direction and conscious awareness.
  • Lower neural activation thresholds are sufficient for direct gaze to reach awareness compared to averted gaze.
  • This provides a neural basis for the prioritized processing of direct gaze in social contexts.