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Strategy implementation in obsessive-compulsive disorder and trichotillomania.
Samuel R Chamberlain1, Andrew D Blackwell, Naomi A Fineberg
1Department of Psychiatry, University of Cambridge School of Clinical Medicine, Addenbrooke's Hospital, Cambridge, UK. src33@cam.ac.uk
Psychological Medicine
|October 6, 2005
Summary
Patients with obsessive-compulsive disorder (OCD) show strategy implementation deficits, unlike those with trichotillomania. This suggests fronto-striatal dysfunction is key in OCD, impacting cognitive flexibility.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Strategy use in neuropsychological tasks relies on fronto-striatal circuitry.
- Patients with obsessive-compulsive disorder (OCD) exhibit impaired spontaneous strategy use.
- The impact of strategy training on OCD and trichotillomania performance is not well-understood.
Purpose of the Study:
- To investigate the effects of strategy training on visuospatial sequence generation in OCD and trichotillomania.
- To compare the cognitive flexibility and fronto-striatal function between OCD, trichotillomania, and control groups.
Main Methods:
- Assessed visuospatial sequence generation before and after strategy training in 20 OCD patients, 17 trichotillomania patients, and 20 controls.
- Participants were matched for age, education, and IQ.
- Evaluated memory span, action monitoring, and baseline sequence generation ability.
Main Results:
- OCD patients did not improve sequence generation after strategy training, despite successful training completion.
- Trichotillomania patients showed significant performance improvement post-training, comparable to controls.
- No group differences were observed in baseline sequence generation, memory span, or action monitoring.
Conclusions:
- Deficits in strategy implementation, indicating cognitive inflexibility and fronto-striatal dysfunction, are characteristic of OCD.
- These deficits are not apparent in trichotillomania, suggesting distinct neurocognitive profiles.
- Further research is needed to explore cognitive flexibility across obsessive-compulsive spectrum disorders and identify underlying neural mechanisms.