Monocularly Evoked Electroencephalogram Potentials : Influence of Target Structure presented to the other Eye

THE average evoked electroencephalogram potentials (EP) in humans are reduced in amplitude if the flashing target is structured instead of uniformly illuminated 1 . Furthermore, if the flashing stimulus is presented to one eye, the EP is decreased when the other eye sees a steadily illuminated target instead of a dark field 2,3 , or when the image moves instead of remaining stationary on the retina 2 . These effects were attributed to the increased complexity of the presentation, which absorbs more cortical capacity and leaves less to participate in the evoked response. The question arises whether the EP elicited by monocular flash stimulation is sensitive enough to reveal changes related to the target structure presented to the other eye.