Ambivalence-dependent alterations in brain function during self-evaluation in adults with depressive symptoms

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Patients with depression often exhibit distorted self-beliefs, like all-or-nothing thinking.
• However, the specific behavioral and neural mechanisms underlying self-evaluation in depression remain unclear.

Purpose of the Study:

• To investigate behavioral and brain activity differences during self-evaluation in adults with varying depression severity.
• To explore the relationship between depression severity and self-evaluation processes, including reaction times and brain activation patterns.

Main Methods:

• fMRI scans were used to examine brain activity in 117 participants with a range of depression severity.
• Participants rated their belief in self-related and other-related statements.
• Mixed-effects models analyzed task characteristics and depression severity's impact on behavior and brain function.

Main Results:

• Greater depression severity correlated with increased overall ambivalence (decreased all-or-nothing thinking).
• Reaction times for low-ambivalence judgments increased with depression severity.
• Altered brain function was observed, including decreased activation in the medial prefrontal cortex, superior frontal cortex, and perigenual anterior cingulate cortex (pgACC) during low-ambivalence self-evaluation.
• The pgACC showed increased activation during high-ambivalence self-evaluation.

Conclusions:

• Depression is associated with distinct behavioral and neural patterns during self-evaluation.
• Findings highlight altered cognitive and neural processes in self-belief evaluation in depression.
• This research could inform the development of targeted interventions for cognitive distortions in depression.