Anxiety-Related Modulation of Early Neural Responses to Task-Irrelevant Emotional Faces

Area of Science:

• Cognitive Neuroscience
• Psychophysiology

Background:

• Trait anxiety is linked to biased processing of threat-related stimuli.
• Anxious individuals may exhibit heightened sensitivity to fearful or angry facial expressions.
• These effects might originate in early visual information processing stages.

Purpose of the Study:

• To investigate the hypothesis that high anxiety is associated with biased processing of threat-related stimuli.
• To determine if anxious individuals are more sensitive to facial expressions of fear or anger.
• To explore if these effects are related to early visual processing.

Main Methods:

• Recorded Event-Related Potentials (ERPs) in response to upright and inverted faces in low- and high-anxiety groups.
• Assessed trait anxiety using the Spielberger Trait Anxiety Inventory (STAI).
• Measured behavioral responses and ERPs to neutral visual probe stimuli.

Main Results:

• A standard Face Inversion Effect was observed, affecting P1 and N170 ERP components.
• Differences between anxiety groups were found in the early P1 component at parieto-occipital sites.
• The later N170 component, indexing face processing, was not influenced by trait anxiety levels.

Conclusions:

• Anxiety levels modulate initial visual information processing stages, specifically the P1 component.
• This modulation may reflect anxiety-related differences in involuntary processing of emotional facial expressions.
• Higher anxiety appears to lead to greater attentional engagement and delayed behavioral responses to neutral stimuli.