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McCollough effect
The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings. It is an aftereffect requiring a period of induction to produce it. For example, if someone alternately looks at a red horizontal grating and a green vertical grating for a few minutes, a black-and-white horizontal grating will then look greenish and a black-and-white vertical grating will then look pinkish. The effect is remarkable for often lasting an hour or more, and in some cases after prolonged exposure to the grids, the effect can last up to three and a half months.
The effect was discovered by American psychologist Celeste McCollough in 1965.
==Producing the effect==
To experience the effect, first look at a ''test'' image similar to that at top right. It contains oppositely oriented gratings of lines, horizontal and vertical. Next, stare alternately at two ''induction'' images similar to the ones directly beneath the top image. One image should show one orientation of grating (here horizontal) with a colored background (red) and the other should show the other orientation of grating (here vertical) with a different, preferably oppositely colored background (green). Each image should be gazed at for several seconds at a time, and the two images should be gazed at for a total of several minutes for the effect to become visible. Stare approximately at the center of each image, allowing the eyes to move around a little. After several minutes, look back to the test image; the gratings should appear tinted by the opposite color to that of the induction gratings (i.e., horizontal should appear greenish and vertical pinkish).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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