Visual evoked responses to visual-spatial and verbal stimuli: Evidence of differences in cerebral processing

Abstract

The experiment utilized visual evoked responses (VERs) to investigate lateral asymmetries in the processing of visually presented stimuli. VERs were elicited by letter stimuli requiring verbal analysis and nonverbal pattern stimuli requiring visuospatial analysis. The first positive component (P75) was found to be of a shorter latency in the right hemisphere for both stimulus types. The amplitude of the component P230-N265 was found to be greater in both hemispheres when VERs were elicited by the letter stimuli. It is concluded that the right hemisphere was preeminent in the early stages of the processing of both stimulus types and that P230-N265 reflected a bilateral component of verbal processing. © 1978, Psychonomic Society, Inc.. All rights reserved.