contingent aftereffect
   Also known as contingent perceptual aftereffect. Both terms are used to denote a type of aftereffect that is dependent on (i.e. contingent with) the orientation of the perceived object with respect to the retina. An example is the * McCollough effect, in which the prolonged and alternate viewing of two differently coloured grid patterns with opposite orientations, and the subsequent viewing of a similar pattern in black and white, yields an illusory perception of complementary colours. The contingent aftereffect is classified as a *physiological illusion.
   References
   Ninio, J. (2001). The science of illusions.Translated by Philip, F. Ithaca, NY: Cornell University Press.

Dictionary of Hallucinations. . 2010.

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  • Contingent perceptual aftereffect — Contingent aftereffects are studied in human perception and can be defined as illusory percepts that are apparent on a test stimulus after exposure to an induction stimulus for an extended period. Contingent aftereffects can be contrasted with… …   Wikipedia

  • aftereffect —    Also known as aftersensation and perceptual aftereffect. All three terms refer to the illusory visual perception that may follow prolonged exposure to a particular visual stimulus. As a rule, aftereffects present themselves in the inverted… …   Dictionary of Hallucinations

  • contingent perceptual aftereffect —    see contingent aftereffect …   Dictionary of Hallucinations

  • mccollough effect —    The eponym McCollough effect refers to the American scientist Celeste McCollough Howard, who described the concomitant phenomenon in 1965. The McCollough effect is classified as a contingent aftereffect. It can be induced by the alternate… …   Dictionary of Hallucinations

  • Celeste McCollough — Celeste McCollough, known since about 1996 as Celeste McCollough Howard is an American scientist who conducts research in human visual perception. She is famous for discovering, in 1965, the first contingent aftereffect, known soon after as the… …   Wikipedia

  • McCollough effect — (click to enlarge) A test image for the McCollough effect. On first looking at this image, the vertical and horizontal lines should look black and white, colourless. After induction (see images below), the horizontal lines should look greenish… …   Wikipedia

  • effect — n 1 Effect, result, consequence, upshot, aftereffect, aftermath, sequel, issue, outcome, event are comparable in signifying something, usually a condition, situation, or occurrence, ascribable to a cause or combination of causes. Effect is the… …   New Dictionary of Synonyms

  • Optical illusion — This article is about visual perception. For the Time Requiem album, see Optical Illusion (album). An optical illusion. The square A is exactly the same shade of gray as square B. See checker shadow illusion. An optical illusion (also called a… …   Wikipedia

  • effect — I (New American Roget s College Thesaurus) Result of a cause Nouns 1. effect, consequence, result, upshot, issue, outcome, outgowth, denouement; outgrowth, development, aftermath, aftereffect, fallout, butterfly effect, domino effect, ripple… …   English dictionary for students

  • Neural adaptation — or sensory adaptation is a change over time in the responsiveness of the sensory system to a constant stimulus. It is usually experienced as a change in the stimulus. For example, if one rests one s hand on a table, one immediately feels the… …   Wikipedia

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