illusory contour

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A visual contour in the absence of a lightness or colour gradient in the stimulus, computed in Area V2 of the visual cortex, generating form perception without a corresponding retinal image, the best-known example being the contour of a Kanizsa triangle. Also called an imaginary contour, a Kanizsa contour, or a subjective contour. See also anorthoscopic, cognitive invention, Ehrenstein's brightness illusion, random-dot kinematogram, random-dot stereogram.

Subjects: Psychology.

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