Variation in visual input and the occipital EEG

Abstract

EEG frequency distributions are compared over three viewing conditions: eyes-closed, eyes-open with matt black display, and eyes-open with a patterned display of white geometrical shapes on a black background. The distributions for the three conditions (derived from a total recording time of 24 min) may be ranked in accordance with an arousal hypothesis. Integrated output in all measured frequencies is reduced in the more aroused states, and differences between aroused conditions occur within the alpha and subalpha ranges, rather than in the beta range. © 1969, Psychonomic Journals, Inc.. All rights reserved.