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Behavioural Neurology
Volume 13, Issue 1-2, Pages 29-37

Deficits of Motor Intention following Parietal Lesions

Christopher L. Gore, P. Dennis Rodriguez, and Gordon C. Baylis

University of South Carolina, Department of Psychology, University of South Carolina, Columbia, SC 29208, USA

Received 2 July 2002; Accepted 2 July 2002

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Patients with lesions to the right parietal lobe were tested on their ability to reach to targets, or to respond verbally to targets. The targets occurred at the same two spatial locations -- to the left and right of the patient—with the task being cued by the color of the target. Patients were able to perform both tasks separately rapidly and without error. However, when the two tasks were interleaved, they had difficulty making a response in the left (contralesional) field when this was different to a response that they had just made. These results suggest that lesions to the parietal cortex may cause a deficit in the coding for motor intention, as well as attention in the contralesional field.