![]() Jones and Holding (1975) found that with repeated testing of the effect, the effect itself diminishes subjects inducted for 15 minutes and then tested several times over the course of a few days lost the effect within 5 days, but those inducted for the same time but not exposed to testing until 85 days later retained the effect. McCollough originally reported that these aftereffects may last for an hour or more. After induction, the space between vertical lines should look red and the space between horizontal lines should look green. On first looking at this image, the vertical and horizontal lines should look black and white, colorless. Keep looking between the two colored images for at least three minutes.Ī test image for the McCollough effect. Stare at the center of this image for a few seconds, then at the center of the image to the left (with the red background) for a few seconds. Keep looking between the two colored images for at least three minutes.Ī second induction image for the McCollough effect. Stare at the center of this image for a few seconds, then at the center of the image to the right (with the green background) for a few seconds. One induction image for the McCollough effect. After several minutes, the subject should 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). The subject should stare approximately at the center of each image, allowing the eyes to move around a little. Each image should be gazed at by the subject 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. ![]() 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). Next, the subject stares alternately at two induction images similar to the ones directly beneath the top image. ![]() It contains oppositely-oriented gratings of lines, horizontal and vertical. The effect is inducted by looking at a test image similar to that below. The effect was discovered by American psychologist Celeste McCollough in 1965. The effect is remarkable because, although it diminishes rapidly with repeated testing, it has been reported to last up to 2.8 months when exposure to testing is limited. 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. It is an aftereffect requiring a period of induction to produce it. The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings. ( Learn how and when to remove this template message) ( October 2021) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This article possibly contains original research.
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