Differences in neuropsychological performance between subtypes of obsessive-compulsive disorder

Area of Science:

• Neuropsychology
• Psychiatry
• Cognitive Science

Background:

• Frontal-striatal dysfunction is implicated in obsessive-compulsive disorder (OCD).
• Previous neuropsychological findings in OCD are inconsistent due to disorder heterogeneity and methodological limitations.
• Subtyping OCD may clarify cognitive deficits.

Purpose of the Study:

• To compare neuropsychological performance across distinct OCD subtypes and non-clinical controls (NCs).
• To investigate executive function, visual memory, and attentional-set shifting using the Cambridge Automated Neuropsychological Test Battery (CANTAB).

Main Methods:

• Fifty-nine OCD patients and 59 NCs completed CANTAB tests.
• OCD patients were classified into four subtypes: washers, checkers, obsessionals, and mixed.
• Depression, anxiety, and OCD symptom severity were assessed.

Main Results:

• Checkers exhibited poorer spatial working memory performance.
• Obsessionals showed deficits in the spatial recognition task.
• Checkers and mixed subtypes demonstrated slower planning task performance and poorer pattern recognition compared to NCs.

Conclusions:

• Checkers displayed more significant neuropsychological impairments than other OCD subtypes.
• Observed effects were small, and conclusions are limited by small subtype sample sizes.
• Future research should consider factors influencing neuropsychological performance in OCD subtypes.