Light intensity and binocular rivalry.

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Abstract
A luminous bar was presented to each eye so that the 2 bars appeared to cross in the center of the binocular field. Rivalry occurred at the intersection, where each bar seemed alternately before or behind the other. Raising the illumination of both bars increased their alternation rate to a level that held constant at higher brightnesses, until the rate declined when the light became very intense. With both bars illuminated equally, one S [subject] reported the right bar dominant more than half the time; another S reported the left bar dominant. Raising the illumination of 1 bar increased the duration that it prevailed. Prevalence increased steeply at low intensities, leveled off at higher intensities, and finally declined when the bar became glaringly bright. After viewing 2 bright bars, S reported rivalry between their afterimages, which demonstrates that rivalry can occur when the stimuli occupy fixed retinal locations.

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