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Normal tactile threshold in monkeys with neglect

Departments of Neurology and Neurological Surgery, College of Medicine, University of Florida, and the Veterans Administration Medical Center, Gainesville, FL.

To learn whether animals with parietotemporal lesions have sensory inattention or defective intention, we trained monkeys to respond with the contralateral limb to a threshold tactile stimulus. After parietotemporal lesions that induced neglect, the monkeys continued to respond normally to threshold stimuli on the side opposite the lesion (the neglected side), but made errors when stimulated on the normal side (ipsilateral to the lesion), often failing to use the contralateral extremity. On this learned task, there was no abnormality of sensory input or sensory attention. The problem was attributed to an impaired preparation to respond (intention).

Address correspondence and reprint requests to Dr. Watson, Box J-236, Department of Neurology, College of Medicine, University of Florida, Gainesville, FL 32610.

Supported by the Medical Research Service of the Veterans Administration.

Accepted for publication September 27, 1985.

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