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Task-dependent hemisphere asymmetries of the visual evoked potential

Department of Neurology. University nf California, San Francisco.

Stimulus-related and event-related components of the visual evoked potential were recorded in three separate tasks that required language comprehension or spatial discrimination. Task-dependent asymmetries in the evoked potential were found for both the language task and one of the tasks involving spatial discrimination. Moreover, an identical stimulus presented in two different contexts elicited potentials with a significantly different distribution over the two sides of the head. These asymmetries were largely confined to the event-related components and presumably reflect task-dependent differences in neural processing. Reaction-time studies for these tasks, however, indicated that these asymmetries occurred too late to arise from neural structures responsible for language comprehension or spatial discrimination per se, and must therefore reflect subsequent neural events.

Address correspondence and reprint requests to Dr. Goodin, Department of Neurology. University of California, San Francisco. CA 94143.

Supported in part by a grant from the Academic Senate of the University of California. San Francisco.

Accepted for publication July 17, 1984.