Purkinje image

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A secondary positive afterimage occurring after the primary afterimage following exposure to a brief light stimulus, appearing in the complementary colour to that of the original stimulus, the primary (Hering) afterimage generally being either in the same colour as the stimulus or colourless. Depending on the intensity of the original stimulus, the Purkinje image may persist for several seconds if the gaze is held steady, but it tends to disappear as soon as the eyes are moved, though blinking may briefly restore it. Also spelt Purkyně image. Also called the Purkinje afterimage. See also afterimage, Bidwell's ghost. Compare Hering image, Hess image. [Named after the Czech-born German physiologist Johannes E(vangelista) Purkinje (Purkyně) (1787–1869) who first drew attention to it in 1823]

Subjects: Psychology.

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