Purkinje shift
   see Purkinje effect.

Dictionary of Hallucinations. . 2010.

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  • 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 shift — Purkin′je shift n. the changes in perception of the relative lightness and darkness of different colors as illumination changes from daylight to twilight • Etymology: 1970–75; see Purkinje fiber …   From formal English to slang

  • Purkinje shift — see under phenomenon …   Medical 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 effect — The Purkinje effect (sometimes called the Purkinje shift, or dark adaptation and named after the Czech anatomist Jan Evangelista Purkyně) is the tendency for the peak sensitivity of the human eye to shift toward the blue end of the color spectrum …   Wikipedia

  • 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 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… …   Dictionary of Hallucinations

  • Purkinje cell — Infobox neuron neuron name = Purkinje cell image neuron = PurkinjeCell.jpg caption neuron = Drawing of pigeon Purkinje cells (A) by Santiago Ramon y Cajal location = Cerebellum function = inhibitory projection neuron neurotranmitter = GABA… …   Wikipedia

  • shift — SYN: change. SEE ALSO: deviation. antigenic s. mutation, i.e., sudden change in molecular structure of RNA/DNA in microorganisms, especially viruses, which produces new strains; hosts previously exposed to other strains have little or no acquired …   Medical dictionary

  • Purkinje — Johannes E. von (Jan E. Purkyne), Bohemian anatomist and physiologist, 1787–1869. See P. conduction, P. images, under image, P. shift, subendocardial conducting system of heart, P. cells, under cell, P. corpuscles, under corpuscle, P. fibers,… …   Medical dictionary

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