Purkinje effect
   Also known as Purkinje shift. Both eponyms refer to the Bohemian physiologist Johannes Evan-gelista Purkyne (1787-1869). They are used to denote the physiological phenomenon that at dusk, when the light intensity gradually decreases, the colours red and yellow are perceived to fade faster than blue and violet - that is to say, when said colours are of a comparable brightness. Physiologically, this difference is attributed to the retina's rods being more sensitive to short wavelengths than to long wavelengths. The Purk-inje effect is usually classified as a "physiological illusion.
   References
   Finger, S. (1994). Origins of neuroscience. A history of exploration into brain functions. Oxford: Oxford University Press.
   Purkinje, J.E. (1819). Beobachtungen und Versuche zur Physiolgie der Sinne: Beiträge zur Kennt-niss des Sehens in subjectiver Hinsicht. Prague: Calve.

Dictionary of Hallucinations. . 2010.

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

  • 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… …   Medical dictionary

  • Purkinje — is a name attributed to several biological features, so named for their discovery by Czech anatomist Jan Evangelista Purkyně: *Purkinje cells, located in the cerebellum *Purkinje fibers, located in the heart *The visual Purkinje effect *Purkinje… …   Wikipedia

  • 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 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 , Johannes Evangelista — (1787–1869) Czech physiologist Born at Libochovice (now in the Czech Republic), Purkinje began studying to be a priest but changed to medicine and graduated MD from Charles University, Prague, in 1819. He became professor of physiology and… …   Scientists

  • 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 shift —    see Purkinje effect …   Dictionary of Hallucinations

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