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Robert C. Malenka; Ronald W. Angel, MD; Bethany Hampton, MA; Philip A. Berger, MD

Arch Gen Psychiatry. 1982;39(1):101-107.

Abstract
• Previous work has suggested that normal subjects are able to recognize and correct their own errors of movement without using exteroceptive signals. This ability may be impaired in schizophrenia. Twelve normal subjects, 12 alcoholics, and 14 schizophrenics performed a step-function tracking task designed to prevent the use of exteroceptive signals in correcting errors of movement. The mean probability of correcting an error without external cues was approximately.38 in schizophrenics.70 in normal subjects, and.75 in hospitalized alcoholic patients. There was no difference between groups in the ability to initiate correct responses. The results suggest that schizophrenics are deficient in the ability to monitor ongoing motor behavior on the basis of internal, self-generated cues.

Author Affiliations
From the Departments of Neurology (Mr Malenka and Dr Angel) and Psychiatry and Behavioral Sciences (Ms Hampton and Dr Berger), Veterans Administration Medical Center, Palo Alto, Calif, and Stanford (Calif) University School of Medicine.

Footnotes
Accepted for publication April 20, 1981.

Reprint requests to Neurology Unit (127), Veterans Administration Medical Center, 3801 Miranda Ave, Palo Alto, CA 94304 (Mr Malenka).

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