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Cognitive functioning in adults with Attention-Deficit/ Hyperactivity Disorder

Institute of Medical Science, University of Toronto, and the Hospital for Sick Children

objectives: Children with Attention-Deficit/Hyperactivity Disorder (ADHD) appear to be deficient in executive control. The purpose of this study was to determine if adults with ADHD are also deficient in executive control.

Method: The performance of 18 adults with ADHD and 18 control subjects was compared on two tests of executive control, and two control tasks. The executive control tasks used in the study were the Trail Making Test (B), and the Tower of Hanoi. The control tasks used were the Trail Making Test (A), and the Benton Facial Recognition Test.

Results: The subjects with ADHD performed more poorly than did the normal controls on the executive control tasks. The subjects with ADHD, however, also performed more poorly on the Trail Making Test (A).

Conclusions: The ADHD subjects showed a deficit in executive control, but this deficit was not confined to the executive control domain.

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