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Related Concept Videos

Working Memory01:24

Working Memory

Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this information.

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Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression
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Working-memory fMRI reveals cingulate hyperactivation in euthymic major depression.

Sonja Schöning1, Pienie Zwitserlood, Almut Engelien

  • 1Department of Psychiatry, University of Muenster, Germany.

Human Brain Mapping
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Major depressive disorder (MDD) patients in remission still show abnormal cingulate cortex activation during working memory tasks. This suggests persistent neural changes even after mood improvement, impacting cognitive function.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Cognitive impairments are recognized during acute major depressive disorder (MDD) episodes.
  • However, cognitive function and its neural underpinnings in the euthymic (symptom-free) state of MDD are less understood.
  • Previous research noted prefrontal and cingulate cortex dysfunction in working memory during acute MDD.

Purpose of the Study:

  • To investigate working memory function in euthymic MDD patients.
  • To identify the neurobiological correlates of working memory in euthymic MDD.
  • To determine if abnormal brain activation in key regions persists after depressive symptoms resolve.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) at 3 Tesla was used.
  • A verbal n-back task (0-, 1-, and 2-back) challenged working memory.
  • 28 euthymic unipolar MDD patients and 28 matched healthy controls participated.

Main Results:

  • No significant behavioral differences in working memory performance were observed between groups.
  • Both groups exhibited increased activation with higher memory loads, consistent with typical working memory networks.
  • Euthymic MDD patients showed significant hyperactivation in the cingulate cortex, unlike controls.
  • Lateral prefrontal cortex activation was comparable between patients and controls.

Conclusions:

  • Working memory challenges in euthymic MDD reveal a dissociation between lateral prefrontal and cingulate cortex function.
  • Abnormal cingulate cortex function persists even when mood symptoms are in remission.
  • This persistent abnormality may indicate delayed normalization of prefrontal and limbic cortices, lasting network changes, or compensatory mechanisms in MDD recovery.