Task Demands Modulate Effects of Threatening Faces on Early Perceptual Encoding.

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Social Neuroscience

Background:

• The threat capture hypothesis posits automatic prioritization of threatening stimuli.
• Early perceptual processing of faces is crucial for social interaction.
• The lateralized N170 is an electrophysiological marker sensitive to facial features.

Purpose of the Study:

• To investigate if the threat capture hypothesis applies to early face perception.
• To examine the influence of task relevance on the processing of facial expressions.
• To determine if top-down control modulates threat prioritization in face perception.

Main Methods:

• Electrophysiological recordings (lateralized N170) were used to measure brain responses.
• Participants viewed neutral, happy, and angry faces competing with a house stimulus.
• Task demands were manipulated: faces were either task-relevant (gender identification) or task-irrelevant (pixel task).

Main Results:

• Angry faces elicited an enhanced lateralized N170 compared to happy and neutral faces when faces were task-relevant.
• Facial expression did not affect the lateralized N170 when faces were task-irrelevant.
• Task demands critically modulated the neural response to threatening facial expressions.

Conclusions:

• The prioritization of threatening faces is not automatic but depends on task relevance.
• Top-down, voluntary processing significantly influences the early stages of threat detection.
• The findings challenge the notion of purely automatic threat capture in face perception.