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Specific cognitive deficits in tests sensitive to frontal lobe dysfunction in obsessive–compulsive disorder

Published online by Cambridge University Press:  09 July 2009

D. M. Veale
Affiliation:
Institute of Psychiatry and the University Department of Psychiatry, Royal Free Hospital, London; Department of Psychiatry, University of Cambridge
B. J. Sahakian*
Affiliation:
Institute of Psychiatry and the University Department of Psychiatry, Royal Free Hospital, London; Department of Psychiatry, University of Cambridge
A. M. Owen
Affiliation:
Institute of Psychiatry and the University Department of Psychiatry, Royal Free Hospital, London; Department of Psychiatry, University of Cambridge
I. M. Marks
Affiliation:
Institute of Psychiatry and the University Department of Psychiatry, Royal Free Hospital, London; Department of Psychiatry, University of Cambridge
*
1Address for correspondence: Dr Barbara J. Sahakian, University of Cambridge, Department or Psychiatry, Addenbrooke's Hospital (Box 189), Cambridge CB2 2QQ.

Synopsis

Forty patients with obsessive–compulsive disorder (OCD) were compared to matched healthy controls on neuropsychological tests which are sensitive to frontal lobe dysfunction. On a computerized version of the Tower of London test of planning, the patients were no different from healthy controls in the accuracy of their solutions. However, when they made a mistake, they spent more time than the controls in generating alternative solutions or checking that the next move would be correct. The results suggest that OCD patients have a selective deficit in generating alternative strategies when they make a mistake. In a separate attentional set-shifting task, OCD patients were impaired in a simple discrimination learning task and showed a continuous cumulative increase in the number who failed at each stage of the task, including the crucial extra-dimensional set shifting stage. This suggests that OCD patients show deficits in both acquiring and maintaining cognitive sets.

The cognitive deficits in OCD may be summarized as: (i) being easily distracted by other competing stimuli; (ii) excessive monitoring and checking of the response to ensure a mistake does not occur; and (iii) when a mistake does occur, being more rigid at setting aside the main goal and planning the necessary subgoals. Both studies support the evidence of fronto-striatal dysfunction in OCD and the results are discussed in terms of an impaired Supervisory Attentional System.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1996

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