Purkinje phenomenon

Purkinje phenomenon n a shift of the region of apparent maximal spectral luminosity from yellow with the light-adapted eye toward violet with the dark-adapted eye that is presumably associated with predominance of cone vision in bright and rod vision in dim illumination called also Purkinje effect, Purkinje shift

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as the intensity of illumination decreases and the eye becomes scotopic, the region of maximum visual acuity shifts from red-yellow to blue-green, the reds becoming less luminous, the blues more luminous. Called also Purkinje effect or shift.

Medical dictionary. 2011.

Look at other dictionaries:

  • purkinje phenomenon — noun or purkinje shift also purkinje effect Usage: usually capitalized 1st P : a shift of the region of apparent maximal spectral luminosity from yellow with the light adapted eye toward violet with the dark adapted eye that is presumably… …   Useful english dictionary

  • Purkinje phenomenon —    see Purkinje s colour …   Dictionary of Hallucinations

  • Purkinje effect — n PURKINJE PHENOMENON * * * see under phenomenon …   Medical dictionary

  • Purkinje's colour —    Also known as Purkinje phenomenon, Purkinje hallucination, flicker induced hallucination, and photically induced hallucination. The eponyms Purkinje s colour, Purkinje hallucination, and Purkinje phenomenon refer to the Bohemian physiologist… …   Dictionary of Hallucinations

  • Purkinje figure —    Also known as Purkyne figure. Both eponyms refer to the Bohemian physiologist Johannes Evangelista Purkyne (1787 1869). They are used to denote an entoptic phenomenon consisting of a black, tree like structure that can be made visible under… …   Dictionary of Hallucinations

  • Purkinje afterimage — Pur·kin·je afterimage (.)pər kin jē n a second positive afterimage in a succession of visual afterimages resulting from a brief light stimulus and appearing most distinctly in a hue complementary to that of the original sensation Pur·ky·ne or… …   Medical dictionary

  • purkinje shift — noun see purkinje phenomenon * * * Purkinje shift, the adaptation of the eye to darkness by increasing sensitivity to light of shorter wavelength. ╂[< Johannes E. Purkinje] …   Useful english dictionary

  • purkinje effect — noun see purkinje phenomenon …   Useful english dictionary

  • Purkinje, Jan Evangelista — born Dec. 17, 1787, Libochovice, Bohemia died July 28, 1869, Prague, Czech. Czech experimental physiologist. He discovered the Purkinje effect (as light decreases, red objects appear to fade faster than blue ones), Purkinje cells (large branching …   Universalium

  • Purkinje-Effekt — Hellempfindlichkeitskurve für Nacht (blau) und Tagsehen (rot) …   Deutsch Wikipedia

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