Abstract
Visual-evoked responses were recorded bilaterally from the occipitoparietal region of six split-brain cats, before and 2 days after a unilateral hypothalamic lesion had produced a contralateral sensorimotor neglect syndrome. No consistent change in each visual-evoked response was detected, but there was an average increase in voltage in slow components on the side of the lesion compared to changes on the intact side. It is concluded that sensorimotor neglect is not associated with reduction of sensory input, and that the changed cortical synchrony accompanying this syndrome therefore reflects disruption of a nonsensory mechanism.
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