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Created with Fabric.js 1.4.5 Binocular Rivalry What is it? The fluctuation of conscious perception between two dissimilar images presented to the left andright eye simultaneously. When two conflicting images are presented to the corresponding retinalregions of each eye, the brain enters an unstable state of perceptual dominance and suppression of the two visual stimuli. This phenomenon is known as binocular rivalry (Blake, 2001). At what level of processing does this occur? Early-level processing Late-level processing Early or low leveltheories propose that binocular rivalryis resolved in a low levelof visual processing of the primary visual cortex. This view suggests there are inhibitory interactionsbetween the monocular representations of the rivalstimuli from each eye.Monocular neurons compete for dominance in the primaryvisual cortex or the lateralgeniculate nucleus of the thalamus. Late or high level theories propose that binocular rivalryis resolved in a high levelin the inferotemporalcortex or higher corticalareas.This view suggests there are interactions between the representations of the rival stimuli from each eye.Transpires later in the visualprocess and consists of competitionbetween inconsistent patterns as opposed to competition betweenthe eyes. Two integratedimages are separated and alternatvely perceived Rivalry betweenimages that have been integrated Two distinct images arealternativelyperceived Each eye'simage is suppressed Can stimulus factors affect perceptual dominance? The presence of a gradient orcontextual background thatis inconsistent with the gradientof the image can cause greaterduration of perceptual dominance. Moving or contrasting imagescan decrease the amountof time of the image beingsuppressed. The attentiongrabbing factor will increase itsdominance. Gestalt principles, such as orientation and motion, can cause grouped visual stimulus to remaindominant. sources Debate about binocular rivalry focuses on the level at which theimages experience neural competition for dominance (Tong, Meng & Blake, 2006). potential sites of neural competition
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