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Related Concept Videos

Depressive Disorders: MDD and Dysthymia01:27

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Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
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Related Experiment Video

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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Reduced default mode network suppression during a working memory task in remitted major depression.

Lucie Bartova1, Bernhard M Meyer1, Kersten Diers2

  • 1Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.

Journal of Psychiatric Research
|March 25, 2015
PubMed
Summary
This summary is machine-generated.

Major Depressive Disorder (MDD) remission shows reduced default mode network (DMN) suppression, particularly in adolescent-onset cases. This DMN alteration may predict relapse and inform maintenance treatment strategies.

Keywords:
Default mode networkFunctional magnetic resonance imagingMajor depressive disorderRemissionRuminationWorking memory

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Major Depressive Disorder (MDD) is associated with impaired default mode network (DMN) suppression and increased rumination.
  • Rumination predicts MDD relapse and a more severe illness course.
  • Adolescent-onset MDD patients have higher relapse rates during remission.

Purpose of the Study:

  • To investigate DMN alterations in fully remitted MDD (rMDD) patients, hypothesizing similar DMN suppression deficits as in symptomatic MDD.
  • To explore if these DMN alterations are linked to rumination.
  • To differentiate findings between adolescent-onset and adult-onset rMDD.

Main Methods:

  • Cross-sectional functional magnetic resonance imaging (fMRI) study.
  • 120 adult participants: 78 drug-free rMDD patients (42 adolescent-onset, 36 adult-onset) and 42 healthy controls (HC).
  • Participants performed an n-back task to assess DMN activity and functional connectivity (FC).

Main Results:

  • Remitted MDD patients exhibited diminished DMN deactivation compared to HC, especially in the anterior-medial prefrontal cortex (amPFC).
  • Reduced DMN deactivation in amPFC correlated with a rumination response style.
  • Increased FC was observed between amPFC and the dorsolateral prefrontal cortex in rMDD patients.
  • Significant differences in DMN activity were found between adolescent-onset rMDD patients and HC, but not adult-onset rMDD patients.

Conclusions:

  • Reduced DMN suppression persists in fully remitted MDD, particularly in adolescent-onset cases.
  • DMN suppression deficits may serve as a biomarker for relapse risk in rMDD.
  • Findings suggest potential implications for antidepressant maintenance treatment and clinical trial monitoring.