Enhanced default mode network connectivity with ventral striatum in subthreshold depression individuals
1School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, MA, USA.
Journal of Psychiatric Research
|February 29, 2016
Summary
Subthreshold depression (StD) shows increased connectivity between the default mode network (DMN) and the ventral striatum. This finding in StD patients may indicate a compensatory mechanism for reduced reward function.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Subthreshold depression (StD) is common but understudied due to diagnostic limitations.
- Its neurobiological underpinnings remain unclear, hindering effective treatment.
- Disruptions in the default mode network (DMN) are implicated in major depressive disorder (MDD).
Purpose of the Study:
- To investigate functional connectivity (FC) changes in the DMN in patients with StD.
- To explore the neurobiological mechanisms underlying StD using brain imaging.
Main Methods:
- Utilized independent component analysis (ICA) to examine resting-state functional connectivity (FC).
- Analyzed two cohorts of StD patients (young and middle-aged) and matched controls.
- Assessed FC between the DMN and the ventral striatum, correlating with depressive symptoms (CES-D).
Main Results:
- Found significantly increased FC between the DMN and the ventral striatum in StD patients compared to controls.
- Observed a positive association between DMN-ventral striatum FC and depressive symptom severity (CES-D scores).
Conclusions:
- Enhanced DMN-ventral striatum connectivity in StD may represent a compensatory mechanism.
- This finding sheds light on the neurobiology of subthreshold depression and potential therapeutic targets.
Keywords:
Default mode networkIndependent component analysisResting-state functional connectivitySubthreshold depressionVentral striatumfMRIMore Related Videos
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