SOME OBSERVATIONS ON VISUAL EVOKED RESPONSES (VER) TO DICHOPTIC STIMULATION

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Abstract
The possibility that the interocular depression of VER [visual evoked responses] seen with dioptic stimulation, might reflect alternate suppression or binocular rivalry, unnoticed by the test subjects, was investigated in VER experiments using dichoptic stimulation with patterns of dissimilar form. Red and blue grating and checker board patterns were produced on a color television screen. Appropriate filtering allowed the 2 eyes to be stimulated separately. Provided the patterns were dissimilar enough to produce binocular rivalry, no interocular depression was noticed in the VER. The interocular depression became larger as the patterns were made similar in size and reached a maximum for patterns identical in shape. The interocular depression of the VER reported for dioptic stimulation did not seem to be related to binocular rivalry. Electrophysiological support to the notion of spatial frequency and orientation selective channels in the human visual system is given.