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Probing striato-thalamic function in obsessive-compulsive disorder and Tourette syndrome using neuroimaging methods
S L Rauch1, P J Whalen, T Curran
1Departments of Psychiatry and Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA.
Advances in Neurology
|September 4, 2001
Summary
This study investigates implicit learning in Obsessive-Compulsive Disorder (OCD) using brain imaging. Findings suggest abnormal striato-thalamic circuitry function in OCD patients, potentially aiding diagnosis and treatment.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Contemporary models implicate cortico-striato-thalamo-cortical (CSTC) circuitry in Obsessive-Compulsive Disorder (OCD) and related disorders.
- Implicit learning paradigms offer a method to probe striato-thalamic function.
Purpose of the Study:
- To investigate the role of implicit learning and striato-thalamic function in OCD.
- To examine brain activation patterns during an implicit sequence learning task in patients with OCD and Tourette Syndrome (TS).
Main Methods:
- Utilized a sequence learning task (SRT) combined with functional magnetic resonance imaging (fMRI) and positron emission tomography (PET).
- Assessed striatal and thalamic activation in patients with OCD, TS, and healthy controls.
Main Results:
- Confirmed previous findings of impaired right striatal recruitment in OCD patients during an implicit learning task.
- Observed reliable right-lateralized striatal activation with spatial dissociation between caudate and putamen.
- Identified a temporal window of thalamic deactivation, indicating potential for assessing thalamic gating.
Conclusions:
- Preliminary data suggest abnormal brain activation patterns in the striato-thalamic circuitry of patients with OCD and TS.
- These findings may contribute to understanding the pathophysiology of OCD and related disorders.
- Future research aims to explore generalizability, symptom dimensions, state/trait markers, and parallel processing deficits.