Evoked Potentials to Stimuli Presented to the Suppressed Eye in a Binocular Rivalry Experiment

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IN A BINOCULAR rivalry experiment. a different stimulus is presented to each eye. The subject indicates which of the two stimuli he sees. The eye to which the seen stimulus is presented is called the “dominant” eye. The other eye is called the “suppressed” eye. COBB, ETTLINGER and MORTON (1967) have reported studies of binocular rivalry in lvhich they investigated the cortical responses to probe stimuli presented to the suppressed eye. They concluded that the visually evoked cortical potentials (VECP) are not affected by the dominance status of the eye. This conclusion was essentially based on studies using flickering. or sinusoidaly varying. stimuli. However. in one of their experiments they used the following paradigm. The subject was presented with typical rivalry targets. He indicated by pressing a switch whenever a change occurred in the dominance status of the eyes. Switch closure triggered the immediate presentation of a flash to either the left or the right eye. The eye to be stimulated was selected randomly. VECPs were then obtained for hashes presented to each eye. when it was. and when it was not dominant. The fact that the four VECPs thus obtained were quite similar in shape led Cobb and his associates to conclude that the dominance status of the eye has no effect on the VECP.

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Vision research, v. 10, issue 1, p. 103-106