Identity-expression interaction in face perception: sex, visual field, and psychophysical factors

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• The interaction between facial identity and emotion processing is crucial for social cognition.
• Previous research suggests potential influences of visual field and sex on face perception, but the specific mechanisms of the identity-emotion interaction require further elucidation.

Purpose of the Study:

• To investigate the psychophysical factors governing the interplay between facial identity and emotion.
• To examine the roles of visual field (left vs. right) and sex in this interaction.
• To differentiate between perceptual and decisional contributions to the identity-emotion link.

Main Methods:

• Two experiments were conducted involving participants judging face identity or emotion under varying conditions.
• Stimuli included central target faces and peripheral probe faces presented in either the left or right visual field.
• Psychophysical indices (A' and B") were used to distinguish perceptual from decisional processes.

Main Results:

• A mutual facilitation effect between identity and emotion processing was confirmed.
• No significant differences in accuracy were found based on sex or visual field.
• Women exhibited less processing interference than men, particularly when matching identity with differing emotions after left visual field probe presentation.

Conclusions:

• Identity influences facial emotion processing via perceptual factors, while emotion influences identity processing through decisional factors.
• Men may adopt a more conservative strategy in identity processing under specific conditions (LVF/RH probe).
• Women appear to possess enhanced abilities in extracting invariant facial features for identity recognition.