18 November, 2008
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a phenomenon of visual perception in which perception alternates between different images presented to each eye.
When one image is presented to one eye and a very different image is presented to the other, instead of the two images being seen superimposed, one image is seen for a few moments, then the other, then the first, and so on, randomly, for as long as one cares to look.
erin or corey?
Why, when we have two eyes each of which can support perception by itself, don't we see two of everything and everything is not twice as bright when we have both eyes open?
When dissimilar visual stimuli are imaged on corresponding
retinal regions of the two eyes, the brain lapses into an unstable state characterized by alternating periods of perceptual dominance during which one visual stimulus or the other is seen at a time. This confusion is understandable, for the eyes are signalling the brain that two different objects exist at the same location in space at the same time. Faced with this physical impossibility, the brain, metaphorically
speaking, entertains two alternative perceptual interpretations, changing its mind repeatedly.
retinal regions of the two eyes, the brain lapses into an unstable state characterized by alternating periods of perceptual dominance during which one visual stimulus or the other is seen at a time. This confusion is understandable, for the eyes are signalling the brain that two different objects exist at the same location in space at the same time. Faced with this physical impossibility, the brain, metaphorically
speaking, entertains two alternative perceptual interpretations, changing its mind repeatedly.
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