Differences in Inter-Hemispheric Variance in Brain Responses of Attentive and Inattentive Human Subjects

Abstract

Human Ss were exposed to light flashes under passive viewing conditions and under conditions calling for discriminative responses. Average evoked responses and the variances of these AERs were recorded from corresponding areas of the two hemispheres. The major finding is that, under attentive viewing, the two hemispheres respond with nearly equivalent variance whereas, under passive viewing, inter-hemispheric variance is markedly asymmetrical. Implications are discussed briefly.