Neuropsychological functioning in obsessive-compulsive disorder: are executive functions the key deficit?

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Neuropsychological deficits are reported in obsessive-compulsive disorder (OCD), but findings lack consistency.
• Previous research often used small samples and limited assessments.

Purpose of the Study:

• To comprehensively map the neuropsychological profile of OCD using a large sample and extensive testing battery.
• To clarify executive function impairments in OCD.

Main Methods:

• 150 individuals diagnosed with DSM-IV OCD and 205 healthy controls underwent neuropsychological testing.
• A comprehensive battery of tests assessed various cognitive domains.

Main Results:

• OCD subjects demonstrated significant impairments in visual scanning, planning, concept formation, decision-making, and non-verbal memory recall compared to controls.
• Specific deficits were noted in Colour Trails 1, Tower of Hanoi, Wisconsin Card Sorting Test, Iowa Gambling Task, and Complex Figure Test.

Conclusions:

• OCD is characterized by executive dysfunction, including difficulties with strategizing and cognitive resource organization.
• Implicated brain regions include dorsolateral prefrontal, superior medial prefrontal, and anterior cingulate cortices.
• This suggests OCD may involve more than just orbitofronto-striatal pathways.