Neural mechanisms of self-affirmation's stress buffering effects

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Self-affirmation is known to mitigate stress responses.
• The underlying neural mechanisms of self-affirmation's stress-buffering effects remain unclear.
• Reward-related brain regions, including the ventromedial prefrontal cortex (VMPFC), are implicated in stress regulation.

Purpose of the Study:

• To investigate the neural mechanisms by which self-affirmation reduces stress.
• To test the hypothesis that self-affirmation activates the VMPFC and modulates neural threat responses.
• To explore the functional connectivity between reward and threat circuits during self-affirmation under stress.

Main Methods:

• A within-subjects design using functional magnetic resonance imaging (fMRI).
• Participants completed self-affirmation and control tasks interleaved with an evaluative stress task.
• Analysis of neural activity and functional connectivity in response to self-affirmation and stress.

Main Results:

• Self-affirmation led to reduced self-reported stress and improved performance.
• Increased VMPFC activity was observed during self-affirmation blocks.
• Reduced neural activity in the left anterior insula (AI), but not the dorsal anterior cingulate cortex (dACC), during stress.
• Enhanced functional connectivity between VMPFC and bilateral AI during self-affirmation.

Conclusions:

• Self-affirmation engages the VMPFC, a key reward-related region.
• This engagement appears to reduce neural threat responses in the AI.
• Findings elucidate the neural pathways through which self-affirmation buffers stress via reward system modulation.