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Regional cortical thinning in patients with major depressive disorder: a surface-based morphometry study
Pei-Chi Tu1, Li-Fen Chen, Jen-Chuen Hsieh
1Institute of Neuroscience, School of Life Science, National Yang-Ming University, Taipei 112, Taiwan.
Psychiatry Research
|April 24, 2012
Summary
Major depressive disorder (MDD) is linked to significant cortical thinning, particularly in the prefrontal cortex. This structural brain deficit correlates with impaired executive functions, highlighting a key aspect of MDD.
Area of Science:
- Neuroimaging
- Neuropsychology
- Psychiatry
Background:
- Major Depressive Disorder (MDD) is a prevalent mental health condition.
- Structural brain abnormalities are increasingly recognized in MDD.
- The relationship between cortical structure and executive function in MDD requires further investigation.
Purpose of the Study:
- To investigate cortical thinning in patients with MDD using surface-based morphometry.
- To examine the functional correlates of cortical thinning with executive functions.
- To compare brain structure and function between MDD patients and healthy controls.
Main Methods:
- Structural T1 magnetic resonance imaging (MRI) was acquired from 36 MDD patients and 36 healthy controls.
- Automated surface-based morphometry (FreeSurfer) was used to measure cortical thickness.
- Executive functions were assessed using the Color Trail Test (CTT) and Wisconsin Card Sorting Test (WCST).
Main Results:
- MDD patients exhibited significant cortical thinning in the prefrontal cortex compared to controls.
- Additional areas of thinning were observed in the inferior parietal cortex, middle temporal gyrus, entorhinal cortex, lingual cortex, and postcentral gyrus.
- Cortical thinning in frontoparietal regions predicted worse performance on the CTT 2, with differing correlations between groups.
Conclusions:
- The findings support a significant role for prefrontal structural deficits in MDD.
- Aberrant structural-functional relationships are evident in MDD patients.
- Cortical thinning is a key neurobiological feature associated with cognitive impairments in MDD.
