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Alternation learning in obsessive-compulsive disorder

R Gross-Isseroff1, Y Sasson, H Voet

  • 1Division of Psychiatry, Chaim Sheba Medical Center, Tel Hashomer, Israel.

Biological Psychiatry
|April 15, 1996
PubMed
Summary
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Obsessive-compulsive disorder (OCD) patients showed significant cognitive deficits on the Wisconsin Card Sorting Test and an alternation learning task. These findings suggest orbitofrontal cortex dysfunction may underlie OCD symptoms.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Obsessive-compulsive disorder (OCD) is a mental health condition characterized by persistent, unwanted thoughts and repetitive behaviors.
  • Cognitive impairments are increasingly recognized as a feature of OCD, impacting executive functions.
  • The orbitofrontal cortex (OFC) is implicated in decision-making, impulse control, and emotional regulation, functions potentially affected in OCD.

Purpose of the Study:

  • To investigate executive function deficits in women with OCD using neuropsychological tests.
  • To explore the relationship between cognitive performance and symptom severity in OCD.
  • To examine the potential role of orbitofrontal cortex dysfunction in OCD.

Main Methods:

  • The Wisconsin Card Sorting Test (WCST) and an alternation learning task were administered to 15 women with OCD and 15 matched healthy controls.

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  • Demographic data (age, sex, education, intelligence) were collected and used as covariates.
  • Symptom severity in the OCD group was assessed.

    • Main Results:

    • OCD patients demonstrated significantly slower performance on the WCST compared to controls.
    • Impaired performance on the alternation learning task was observed in the OCD group, although this difference lessened when education was controlled.
    • A positive correlation was found between alternation task performance and OCD symptom severity.

    Conclusions:

    • The cognitive impairments observed in OCD patients, particularly on tasks sensitive to orbitofrontal cortex function, support the hypothesis of OFC dysfunction in OCD.
    • Executive function deficits may be a core feature of OCD, linked to specific neural substrates.
    • Further research is warranted to elucidate the precise mechanisms of OFC involvement in OCD.