Disturbed Monitoring and Response Inhibition in patients with Gilles De La Tourette Syndrome and Co-Morbid Obsessive Compulsive Disorder

S. V. Müller,S. Johannes,B. Wieringa,A. Weber,K. Müller-Vahl,M. Matzke,H. Kolbe,R. Dengler,T. Münte

Published 2003 in Behavioural Neurology

ABSTRACT

Objective: Fronto-striatal dysfunction has been discussed as underlying symptoms of Tourette syndrome (TS) with co-morbid Obsessive Compulsive Disorder (OCD). This suggests possible impairments of executive functions in this disorder, which were therefore targeted in the present study. Results: A comprehensive series of neuropsychological tests examining attention, memory and executive functions was performed in a group of 14 TS/OCD in co-occurrence with OCD patients and a matched control group. Results: While attentional and memory mechanisms were not altered, TS/OCS patients showed deficits in executive functions predominately in the areas of response inhibition and action monitoring. Conclusions: These findings provide further evidence for a substantial impairment of the frontal-striatal-thalamic-frontal circuit. We propose that the deficits in monitoring, error detection and response inhibition constitute the major impairment of TS/OCD patients in the cognitive domain.

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