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Depression, rumination and the default network.

Marc G Berman1, Scott Peltier, Derek Evan Nee

  • 1Department of Psychology, University of Michigan, 530 Church Street, Ann Arbor, MI 48109-1043, USA. bermanm@umich.edu

Social Cognitive and Affective Neuroscience
|September 22, 2010
PubMed
Summary
This summary is machine-generated.

Major depressive disorder (MDD) is linked to increased default network connectivity in the brain during rest. This heightened connectivity between brain regions correlates with rumination, but not during task engagement.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Major depressive disorder (MDD) is associated with altered default mode network (DMN) activity, particularly increased connectivity with the subgenual cingulate cortex.
  • This hyper-connectivity is often theorized to underlie rumination, a core symptom of MDD involving perseveration on negative self-referential thoughts.
  • However, the direct link between DMN connectivity and rumination, and how this connectivity changes with task engagement, remains underexplored.

Purpose of the Study:

  • To investigate the functional connectivity of the DMN within the subgenual cingulate cortex in individuals with MDD compared to healthy controls.
  • To examine how this connectivity differs during rest versus task engagement.
  • To determine the relationship between subgenual cingulate connectivity and behavioral measures of rumination.

Main Methods:

  • Utilized a seed-based connectivity analysis approach.
  • Compared neural functional connectivity between the posterior cingulate cortex and subgenual cingulate cortex in individuals with MDD and healthy controls.
  • Assessed connectivity during both resting-state and task-engagement conditions.
  • Correlated connectivity measures with established behavioral scales for rumination, brooding, and reflection.

Main Results:

  • Individuals with MDD exhibited significantly greater functional connectivity between the posterior cingulate cortex and subgenual cingulate cortex during rest periods compared to healthy individuals.
  • This difference in connectivity was not observed during task engagement.
  • The increased rest-period connectivity in MDD patients strongly correlated with behavioral measures of rumination and brooding.
  • No significant correlation was found between this connectivity and measures of reflection.

Conclusions:

  • The findings suggest that heightened default mode network connectivity with the subgenual cingulate during rest is a neural correlate of rumination in major depressive disorder.
  • This aberrant connectivity may be specific to resting states and not task-related processing.
  • These results provide empirical support for the link between specific patterns of brain connectivity and the perseverative thought processes characteristic of MDD.