Journal
NEUROREPORT
Volume 11, Issue 13, Pages 2843-2848Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200009110-00004
Keywords
human electrophysiology; intracranial recordings; source localization; surface EPs; visuomotor transformation
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Visuomotor tasks elicit neuronal activity in primate motor areas at relatively short latencies. Although this early activity embodies features of visual responses (short latency. stimulus-dependency). its sensory nature has been questioned. We investigated neural correlates of visuomotor performance in human motor areas using scalp and intracranial event-related potential measures. A simple visuomanual reaction-time task evoked early potentials at 133-145 ms post-stimulus which occurred much earlier than the motor potentials of the same region. The amplitude of the early potentials covaried with stimulus location and was independent of parameters of the motor response. Because of their timing, stimulus-dependency and characteristics of our behavioral task, the early potentials are suggested to reflect neuronal responses of sensory nature rather than processing related to pure motor aspects of the task. NeuroReport 11:2843-2848 (C) 2000 Lippincott Williams & Wilkins.
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