Fear boosts the early neural coding of faces

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Interaction

Background:

• Rapid processing of facial identity and emotions is crucial for social interaction.
• Early neural responses, specifically the N170 component, are linked to facial processing.
• It remains unclear if all facial expressions equally affect the N170 and if this modulation depends on task relevance.

Purpose of the Study:

• To investigate whether all basic facial expressions uniformly modulate the N170 component.
• To determine if task relevance influences the N170 modulation by facial expressions.
• To explore the neural basis of fear expression processing.

Main Methods:

• Recorded high-resolution electrophysiological signals from 22 observers viewing six basic expressions plus neutral faces.
• Employed a repetition suppression paradigm with adaptor-target trials.
• Utilized single-trial Repetition Suppression (stRS) analysis with a hierarchical linear model and included identity/expression task variations.

Main Results:

• Fear was the sole expression that modulated the N170 component, showing the strongest stRS responses.
• Behavioral performance in catch trials corroborated the distinct neural processing of fear.
• Task relevance did not alter the N170 modulation by fear expression.

Conclusions:

• Fear elicits unique neural processes, distinct from other facial expressions.
• These distinct processes enhance attention and facilitate early facial coding.
• The N170 component plays a critical role in the rapid, task-independent processing of fear.