Electrical correlates of normal binocular vision.

Several characteristics of the visual stimulus determine the waveform of the visually evoked potential (VEP). Many of them must be controlled for the most efficient application of this technique as a clinical diagnostic test. We describe a simple system that demonstrates the effects of the VEP of adding structure to the stimulus, varying the size and clarity of its pattern elements, and presenting an image to the eye opposite the stimulated eye. We identify wave components of the VEP generated by a flashed pattern that reliably reflect each of these changes in stimulus properties.