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Implicit sequence learning in obsessive-compulsive disorder: further support for the fronto-striatal dysfunction

Norbert Kathmann¹, Claudia Rupertseder, Walter Hauke

¹Humboldt University at Berlin, Rudower Chaussee 18, D-12489 Berlin, Germany. kathmann@rz.hu-berlin.de

Biological Psychiatry

|June 9, 2005

Summary

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Obsessive-compulsive disorder (OCD) is linked to impaired implicit learning, a skill acquired through practice. This deficit in implicit sequence learning was observed in OCD patients and persisted even after symptom improvement.

Area of Science:

Neuroscience
Cognitive Psychology
Psychiatry

Background:

Obsessive-compulsive disorder (OCD) is theorized to involve fronto-striatal brain system dysfunctions.
Performance deficits in OCD patients are hypothesized to mirror those seen in patients with lesions in these brain areas.
Implicit procedural learning, the skill acquisition through practice, is a key area for testing this hypothesis.

Purpose of the Study:

To investigate implicit sequence learning in individuals diagnosed with OCD.
To compare implicit learning in OCD patients with healthy controls.
To examine the impact of cognitive-behavioral psychotherapy on implicit learning in OCD.

Main Methods:

The serial reaction time task was employed to assess implicit sequence learning.

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33 patients diagnosed with OCD and 27 healthy participants were included in the study.

Explicit knowledge of the sequence and reassessment after psychotherapy were also evaluated.

Main Results:

Implicit sequence learning was significantly reduced by 41% in the OCD group compared to controls.
Explicit learning and verbal abilities remained unaffected in OCD patients.
The implicit learning deficit was stable over time and independent of symptom remission or depressive symptoms.

Conclusions:

Reduced implicit learning is a distinct trait in individuals with OCD.
These findings support the fronto-striatal dysfunction model of OCD.
Implicit learning deficits may represent a stable characteristic of OCD, irrespective of symptom severity.