Related Experiment Videos
Specific cognitive deficits in tests sensitive to frontal lobe dysfunction in obsessive-compulsive disorder
D M Veale1, B J Sahakian, A M Owen
1Institute of Psychiatry, Royal Free Hospital, London.
Psychological Medicine
|November 1, 1996
Summary
Patients with obsessive-compulsive disorder (OCD) struggle with cognitive flexibility, showing deficits in planning and attention tasks. These findings suggest fronto-striatal dysfunction impacting cognitive set acquisition and maintenance.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Obsessive-compulsive disorder (OCD) is associated with executive function impairments.
- Frontal lobe dysfunction is hypothesized to play a role in OCD pathophysiology.
Purpose of the Study:
- To investigate cognitive deficits in patients with OCD using neuropsychological tests sensitive to frontal lobe dysfunction.
- To explore planning, strategy generation, and attentional set-shifting abilities in OCD.
Main Methods:
- Comparison of 40 OCD patients with matched healthy controls on the Tower of London test and an attentional set-shifting task.
- Neuropsychological assessment focusing on planning accuracy, error correction, and cognitive set acquisition/maintenance.
Main Results:
- OCD patients showed no difference in planning accuracy but spent more time correcting errors, indicating a deficit in generating alternative strategies.
- Impairment was observed in discrimination learning and attentional set-shifting tasks, suggesting difficulties in acquiring and maintaining cognitive sets.
- Cognitive deficits include distractibility, excessive checking, and rigidity in adapting strategies after errors.
Conclusions:
- OCD is characterized by specific cognitive deficits, including impaired cognitive flexibility and attentional control.
- Findings support the hypothesis of fronto-striatal dysfunction in OCD, potentially related to an impaired Supervisory Attentional System.