Response time of stroke patients to a visual stimulus.

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Abstract
We used a computer program to test response time among stroke patients in a clinical setting. Visual stimuli were presented to 82 hospitalized stroke patients, to 21 hospitalized controls, and to 76 nonhospitalized controls. Stroke patients had longer mean response times than controls. Patients with right hemispheric lesions had longer response times than those with left hemispheric lesions when the stimuli were presented on the left. The corresponding phenomenon of longer response times in patients with left hemispheric lesions to stimuli presented on the right was not observed. Patients with right hemispheric lesions with visual hemineglect had a longer mean response time than those without visual hemineglect when the stimuli were presented on the left or centrally, whereas the patients with right hemispheric lesions without neglect had a mean response time similar to that of patients with left hemispheric lesions.

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