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Originally Posted by daz300
why .................. how ....................it is driving me mad ........... is it green or pink ????????????
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"Physiological illusions, such as the afterimages following bright lights or adapting stimuli of excessively longer alternating patterns (contingent perceptual aftereffect, CAE), are the effects on the eyes or brain of excessive stimulation of a specific type - brightness, tilt, colour, movement, and so on. The theory is that stimuli have individual dedicated neural paths in the visual outer wall of an organism for the early stages of visual processing; repetitive stimulation of only a few channels misleads the visual system."
http://en.wikipedia.org/wiki/Optical_illusion
Basically, when you see pink all the time, the "pink receptors" either get tired or discounted and this generates a "negative image" effect where the opposite colour is seen, even though it isn't there.
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