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Striatum-Mediated Deficits in Stimulus-Response Learning and Decision-Making in OCD
Nole M Hiebert1,2,3, Marc R Lawrence3, Hooman Ganjavi4
1Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada.
Patients with obsessive compulsive disorder (OCD) show impaired decision-making and learning. Their brains exhibit reduced activity in the dorsal striatum (DS) and ventral striatum (VS), highlighting striatal dysfunction in OCD.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Obsessive compulsive disorder (OCD) is a common psychiatric condition marked by obsessions and compulsions.
- Neuroimaging studies suggest the striatum plays a role in OCD symptomatology and cognitive deficits.
Purpose of the Study:
- To investigate striatum-mediated cognitive deficits in OCD patients using a stimulus-response learning task.
- To examine the differential roles of the dorsal striatum (DS) and ventral striatum (VS) in OCD.
Main Methods:
- Compared behavioral performance and brain activity in 14 OCD patients and 16 healthy controls during a stimulus-response learning task.
- Utilized functional neuroimaging to assess task-relevant activity in the DS and VS.
Main Results:
- OCD patients demonstrated deficits in decision-making and slower learning compared to controls.
- Reduced task-relevant activity was observed in the DS and VS of OCD patients.
Conclusions:
- The study indicates altered responses in the DS and VS in individuals with OCD.
- Findings link striatal dysfunction to cognitive deficits and symptoms characteristic of OCD.
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