Adaptation and Aftereffects
All aspects of vision adapt—adaptation to light and dark, colors, contrast, direction of motion, orientation, and depth. There are also contingent aftereffects, for example, adaptation to color, contingent upon orientation, which take minutes of viewing to form and may last for hours. Almost any two (or even three) aspects of vision can be combined to give a contingent aftereffect. There are visuomotor adaptations, where pointing is affected by putting prisms over the eyes, and people may adapt to reversal of the whole world, up-down, or left-right over a period of days. In these cases one aspect of vision may adapt faster than another, and some may not adapt at all. Visual adaptations occur because of changes in the responses of cells in areas where the normal response occurs, and visuomotor adaptations occur because of changes in the cerebellum.
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