Social decisions affect neural activity to perceived dynamic gaze.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Cognition

Background:

• Gaze direction influences attention and neural responses to faces, particularly the N170.
• Previous research shows inconsistent findings regarding gaze direction's effect on neural processing.
• Task demands and stimulus characteristics likely contribute to these inconsistencies.

Purpose of the Study:

• To investigate how task type (social vs. non-social) affects neural responses to dynamic gaze changes.
• To examine neural processing of gaze transitions (away vs. toward observer), with and without direct eye contact.
• To explore the role of social judgment in modulating early visual processing of gaze.

Main Methods:

• Event-related potentials (ERPs) and behavioral data were collected from subjects.
• Participants performed social and non-social judgment tasks on dynamic gaze stimuli.
• Stimuli included gaze moving away and toward the observer, with and without resulting eye contact.

Main Results:

• In non-social tasks, N170 was larger for gaze aversion than gaze toward the observer.
• In social tasks, this difference diminished in the right hemisphere, suggesting enhanced N170 to toward gaze.
• Behavioral and ERP data indicated increased saliency of toward-gaze motion during social judgments.

Conclusions:

• Social judgment tasks enhance the neural processing of gaze motion directed toward the observer.
• Findings suggest two distinct processing modes: a 'default mode' for spatial information and a 'socially aware mode' for social judgments.
• The mechanism for switching between these processing modes requires further investigation.