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Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression
Published on: May 19, 2015
Cognitive inhibition and working memory in unipolar depression
Benedicte Gohier1, Laetitia Ferracci, Simon A Surguladze
1Department of psychiatry, University Hospital of Angers, F-49033 Angers, France. gohier.benedicte@orange.fr
Journal of Affective Disorders
|December 2, 2008
Summary
Major Depressive Disorder (MDD) patients struggle with cognitive inhibition, making errors and showing slower responses on tasks involving neutral information. This difficulty impacts working memory and executive functions, contributing to cognitive deficits in depression.
Area of Science:
- Cognitive Neuroscience
- Psychiatry
Background:
- Major Depressive Disorder (MDD) is increasingly linked to cognitive impairments, including attention, working memory, and executive functions.
- Specific deficits in cognitive inhibition have been observed, but their scope with neutral stimuli remains unclear.
Purpose of the Study:
- To investigate cognitive inhibition mechanisms in working memory using emotionally neutral material in individuals with MDD.
- To test the hypothesis that cognitive inhibition deficits in MDD are global and not stimulus-dependent.
Main Methods:
- A cohort of 20 MDD patients and 20 healthy controls underwent a battery of neuropsychological tests.
- Tests included the Prose Distraction Task (PDT), Trail Making Test (TMT), Stroop test, and others assessing executive functions like planning and flexibility.
Main Results:
- MDD patients exhibited significant impairments in cognitive inhibition, demonstrated by increased errors and slower response times on tasks like PDT, Stroop, TMT, and Rule Shift Cards (RSC).
- Deficits were also noted in Hayling Sentence Completion (HSC), verbal fluency, and the Modified 6 Elements task.
- Impaired access function correlated significantly with depression severity.
Conclusions:
- Individuals with MDD demonstrate an inability to inhibit neutral information from entering working memory and to suppress irrelevant data.
- These deficits in cognitive inhibition may explain the observed cognitive slowness and attentional problems in depression.
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