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.