Visually evoked responses and reaction times in man : effects of interocular and intraocular disparity

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Duane Elwood Shuttlesworth (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site:
M. Russell Harter

Abstract: Interocular and intraocular inhibitory effects on visually evoked responses (VERs) and reaction times (RTs) in man as a function of the degree of retinal disparity were studied. Evoked potentials were recorded with scalp electrodes located on the midline and 2.5 cm to the right of the midline over the occipital area. An evoking stimulus (a transient light flash) was always viewed by the right eye while a steadily illuminated stimulus (the "inhibitory" stimulus) was viewed by either the left eye (interocular condition) or the right eye (intraocular condition). Three hypotheses were proposed: First, that the overall amplitude of the VER would decrease and reaction time would increase when the distance between the retinal points being stimulated by the continuous stimulus and the transient stimulus is reduced; second, that the inhibitory effect would be interocular in nature and third, that, due to the stronger inhibitory effects within the central receptive fields, the VER to foveal stimulation should more readily attenuate and RT more readily increase as the degree of disparity is decreased between the continuous and transient stimuli than would be the case if the two types of stimulation are shifted to more peripheral retinal receptive fields where inhibitory effects are less strong.

Additional Information

Language: English
Date: 1974
Visual evoked response
Reaction time

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