Not so harmless anymore: how context impacts the perception and electrocortical processing of neutral faces

Area of Science:

• Cognitive Neuroscience
• Social Psychology
• Visual Perception

Background:

• Facial appearance heavily influences first impressions.
• Face perception relies on both internal features and external contextual information, such as verbal descriptions.
• Understanding the temporal dynamics of contextual influence on face processing is crucial.

Purpose of the Study:

• To investigate the time course of how contextual information affects cortical face processing.
• To examine the impact of affective valence and self-reference in verbal descriptions on face perception.
• To determine if top-down contextual influences modify early visual perception.

Main Methods:

• Event-related brain potentials (ERPs) were recorded in response to neutral faces.
• Participants were presented with brief verbal descriptions preceding faces, varying in affective valence (negative, neutral, positive) and self-reference (self-related, other-related).
• Behavioral affective ratings of faces were collected to complement electrophysiological data.

Main Results:

• Both early and late stages of cortical face processing were enhanced by negative, positive, and self-relevant descriptions.
• These modulations occurred even though the faces themselves did not perceptually differ.
• Behavioral ratings corroborated the electrophysiological findings, indicating altered affective perception.

Conclusions:

• Contextual information, particularly affective and self-relevant verbal descriptions, significantly modulates early visual perception of faces.
• This study provides the first electrophysiological and behavioral evidence of top-down influences on cortical face processing.
• Contextual cues play a critical role in shaping our immediate perception and evaluation of others.