Divergent subcortical activity for distinct executive functions: stopping and shifting in obsessive compulsive disorder

Morein-Zamir, S. and Voon, V. and Dodds, C.M. and Sule, A. and van Niekerk, J. and Sahakian, B.J. and Robbins, T.W. (2015) Divergent subcortical activity for distinct executive functions: stopping and shifting in obsessive compulsive disorder. Psychological Medicine. ISSN 0033-2917

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Abstract

Background There is evidence of executive function impairment in obsessive compulsive disorder (OCD) that potentially contributes to symptom development and maintenance. Nevertheless, the precise nature of these executive impairments and their neural basis remains to be defined. Method We compared stopping and shifting, two key executive functions previously implicated in OCD, in the same task using functional magnetic resonance imaging, in patients with virtually no co-morbidities and age-, verbal IQ- and gender-matched healthy volunteers. The combined task allowed direct comparison of neural activity in stopping and shifting independent of patient sample characteristics and state variables such as arousal, learning, or current symptom expression. Results Both OCD patients and controls exhibited right inferior frontal cortex activation during stopping, and left inferior parietal cortex activation during shifting. However, widespread under-activation across frontal-parietal areas was found in OCD patients compared to controls for shifting but not stopping. Conservative, whole-brain analyses also indicated marked divergent abnormal activation in OCD in the caudate and thalamus for these two cognitive functions, with stopping-related over-activation contrasting with shift-related under-activation. Conclusions OCD is associated with selective components of executive function, which engage similar common elements of cortico-striatal regions in different abnormal ways. The results implicate altered neural activation of subcortical origin in executive function abnormalities in OCD that are dependent on the precise cognitive and contextual requirements, informing current theories of symptom expression.

Item Type: Journal Article
Additional Information: Citation: Morein-Zamira, S., Voon, V., Dodds, C. M., Sule, A., van Niekerk, J., Sahakian, B. J. and Robbins, T. W., 2015. Divergent subcortical activity for distinct executive functions: stopping and shifting in obsessive compulsive disorder. Psychological Medicine. Early view article: Accepted 06 October 2015, Published 06 November 2015..
Faculty: Faculty of Science & Technology
Depositing User: Mr I Walker
Date Deposited: 23 Dec 2015 15:10
Last Modified: 03 Jul 2017 08:45
URI: http://arro.anglia.ac.uk/id/eprint/592566

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