Stress-related changes in amygdala-prefrontal network functional connectivity.

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Chronic stress is linked to physical and mental health issues.
• The prefrontal cortex (PFC) and amygdala regulate stress responses.
• Understanding amygdala-PFC connectivity is crucial for stress research.

Purpose of the Study:

• Investigate changes in amygdala-PFC functional connectivity.
• Examine stress effects in healthy individuals without psychiatric history.
• Assess differential impacts of daily and chronic stress.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI).
• Analysis of functional connectivity in 40 healthy participants.
• Correlation of connectivity with stress, anxiety, and depression levels.

Main Results:

• Chronic stress differentially affects amygdala-PFC functional interactions.
• Stress impacts the amygdala's functional network beyond the PFC.
• Anxiety/perceived stress decreases amygdala-PFC connectivity (dlPFC, frontopolar cortex).
• Depression severity increases amygdala connectivity (OFC, mPFC).

Conclusions:

• Amygdala functional network alterations are associated with stress levels.
• Connectivity changes in the amygdala network are linked to anxiety and depression.
• Findings highlight the amygdala's role in stress response and related disorders.