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A study of parallel implicit and explicit information processing in patients with obsessive-compulsive disorder.

Thilo Deckersbach1, Cary R Savage, Tim Curran

  • 1Department of Psychiatry, Massachusetts General Hospital-East, Building 149, 13th Street, 9th Floor, Charlestown, MA 02129, USA.

The American Journal of Psychiatry
|October 3, 2002
PubMed
Summary

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Obsessive-compulsive disorder (OCD) patients showed impaired implicit sequence learning under dual-task conditions. This suggests that explicit processing demands interfere with the ability of individuals with OCD to learn implicitly.

Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Psychiatry

Background:

  • Implicit sequence learning relies on frontal-striatal networks, which are implicated in obsessive-compulsive disorder (OCD) pathophysiology.
  • Neuroimaging suggests OCD patients may utilize explicit learning systems to compensate for striatal dysfunction during implicit learning.

Purpose of the Study:

  • To investigate implicit sequence learning in patients with obsessive-compulsive disorder (OCD) under dual-task conditions.
  • To determine if concurrent explicit information-processing demands disrupt implicit learning in OCD patients.

Main Methods:

  • A dual-task paradigm was employed, assessing 25 OCD patients and 25 healthy controls.
  • Participants simultaneously engaged in an explicit memory task and an implicit learning task.

Related Experiment Videos

  • The study predicted that dual-task demands would hinder compensatory processes in OCD patients.

    • Main Results:

    • Obsessive-compulsive disorder patients demonstrated a significant deficit in implicit sequence learning compared to healthy subjects.
    • OCD patients failed to exhibit evidence of implicit learning under the dual-task conditions.

    Conclusions:

    • The findings support the hypothesis that concurrent explicit and implicit information-processing demands interfere with implicit learning in OCD.
    • This interference may stem from the inability of OCD patients to effectively employ compensatory neural strategies under dual-task load.