Beyond acute social stress: increased functional connectivity between amygdala and cortical midline structures

Area of Science:

• Neuroscience
• Psychology

Background:

• The amygdala's role in acute stress is well-documented.
• Its function during the stress recovery period remains largely unexplored.

Purpose of the Study:

• Investigate amygdala functional connectivity during the recovery phase after stress.
• Identify brain circuits involved in adaptive stress recovery and emotional memory consolidation.

Main Methods:

• Healthy participants underwent a psychosocial stress task or a control procedure.
• Resting-state functional magnetic resonance imaging (fMRI) was performed one hour post-task.
• Seed-based correlation analysis assessed amygdala functional connectivity.

Main Results:

• The stress group showed heightened physiological and behavioral stress responses.
• Increased amygdala functional connectivity with posterior cingulate cortex, precuneus, and medial prefrontal cortex was observed in the stress group.
• These connected regions are involved in emotion processing, regulation, and autobiographical memory.

Conclusions:

• Stress impacts amygdala functional connectivity with cortical midline structures during the recovery phase.
• These changes may reflect top-down emotional control and consolidation of self-relevant information.
• Findings provide a novel perspective on stress sensitivity and resilience mechanisms.