Documenta ophthalmologica. Advances in ophthalmology vol:95 issue:3-4 pages:247-55
Rhesus monkeys can have deficiencies in stereo vision, making it necessary to screen monkey subjects intended for single cel studies of stereo-based depth processing. We measured VEPs in two monkeys using a dynamic random-dot display in which a stereo-defined checkerboard reversed in depth. Monkeys fixated upon a small dot during stimulus presentation. One monkey showed clear evoked potentials in response to changes in disparity that were simular to those obtained in human subjects, using an identical stimulus paradigm. Controls with presentations of the monocular stimulus sequences (in which no depth reversal can be perceived) yielded no or much weaker VEPs. In the other animal, however, there was no difference in evoked potential between the two conditions. These elektrophysiological findings closely match the performance of these same two objects in a disparity discrimination task in which they were previously trained. We conclude that VEPs using this type of stimulus display can be used to screen monkeys for single cell of behavioral studies of stereopsis.