Neural divergence between individuals with and without minor depression during dynamic emotion processing: a...

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Minor depression (MD) neuropathology, especially in recurrent cases, is under-researched.
• Emotion processing deficits are a key feature of depressive disorders.
• The default mode network's role in MD requires further investigation.

Purpose of the Study:

• To investigate neural differences in emotional stimulus processing between individuals with MD and normal controls (NC).
• To explore the relationship between neural differentiation, depressive symptoms, and psychological resilience in MD.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to observe brain activity during emotional film clip viewing.
• Inter-subject correlation and functional connectivity analyses identified neural differentiation patterns.
• Clinical interviews, cognitive assessments, and resilience scales were administered.

Main Results:

• Consistent neural differentiation between MD and NC was observed in the posterior cingulate cortex (PCC) and precuneus (PCUN) across emotional conditions.
• Neural response similarity in the PCC and PCUN correlated negatively with depressive symptoms.
• This neural similarity mediated the link between psychological resilience and depression severity.

Conclusions:

• The PCC and PCUN, core default mode network regions, are implicated in the emotion processing deficits characteristic of MD.
• Altered neural processing in these regions may be a key neuropathological mechanism in minor depression.