Inverse amygdala and medial prefrontal cortex responses to surprised faces

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Social Neuroscience

Background:

• Facial expression interpretation is crucial for social interaction.
• The amygdala and medial prefrontal cortex (mPFC) are implicated in emotion processing and social cognition.

Purpose of the Study:

• To investigate the neural mechanisms underlying individual differences in interpreting surprised facial expressions.
• To examine the relationship between amygdala and mPFC activity during the interpretation of surprised faces.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants interpreted surprised facial expressions as either positive or negative.
• Correlation analyses were performed on fMRI signal changes in the amygdala and mPFC.

Main Results:

• Inverse fMRI activation patterns were observed in the amygdala and mPFC based on interpretation valence.
• Negative interpretations of surprised faces correlated with increased activity in the right ventral amygdala.
• Positive interpretations correlated with increased activity in the ventral mPFC, with inverse correlation between the two regions.

Conclusions:

• Individual differences in judging surprised faces are associated with an inverse relationship between amygdala and mPFC activity.
• This circuitry is critical for assessing stimuli predicting potential positive versus negative outcomes.
• The findings highlight the role of amygdala-mPFC interactions in subjective emotional appraisal of social cues.