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Prefrontal cortex function in remitted major depressive disorder.
N L Nixon1, P F Liddle, G Worwood
1Division of Psychiatry, The Institute of Mental Health, University of Nottingham, Nottingham, UK. neil.nixon@nottingham.ac.uk
Psychological Medicine
|October 2, 2012
Summary
Major depressive disorder (MDD) is linked to reduced activity in the right dorsomedial prefrontal cortex (dmPFC) and rostral anterior cingulate cortex (rACC). This hypoactivity may increase vulnerability to MDD recurrence.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Major depressive disorder (MDD) models implicate the rostral anterior cingulate (rACC) and dorsomedial prefrontal cortex (dmPFC) in cognitive-affective dysregulation.
- Aberrant neural activity in these regions may predict relapse risk in remitted MDD patients.
Purpose of the Study:
- To assess functional activity in the rACC and dmPFC in patients with MDD vulnerability.
- To compare neural activity between remitted high-risk patients, those experiencing recurrence, and controls.
Main Methods:
- Acquired T2*-weighted BOLD contrast images during a Go/No-Go task with negative feedback.
- Analyzed blood oxygen level-dependent (BOLD) contrast data for error commission (EC) and visual negative feedback (VNF).
- Utilized region of interest (ROI) analysis focusing on rACC and dmPFC coordinates.
Main Results:
- Patients with MDD showed significant right dmPFC (BA 9) hypoactivity during both EC and VNF compared to controls.
- Significant rACC (BA 32) hypoactivity was observed during EC in MDD patients.
- Preliminary follow-up suggested persistent right dmPFC hypoactivity associated with 1-year recurrence.
Conclusions:
- Convergent hypoactivity in the right dmPFC (BA 9) during VNF and EC processing is linked to MDD vulnerability.
- This hypoactivity may impair adaptive reappraisal of negative experiences.
- Findings support the role of dmPFC and rACC dysfunction in MDD and recurrence risk.
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