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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. [1970–75; see Purkinje fiber] EncyclopediaSeePurkinje effectPurkinje shift
Pur·kin·je phe·nom·e·non (pŭr-kin'jē), in the light-adapted eye, the region of maximal brightness is in the yellow; in the dark-adapted eye, the region of maximal brightness is in the green. Synonym(s): Purkinje effect, Purkinje shiftPurkinje, Johannes E. von (Jan E. Purkyne), Bohemian anatomist and physiologist, 1787-1869. Purkinje afterimage - Synonym(s): Bidwell ghostPurkinje cells - large nerve cells of the cerebellar cortex with a piriform cell body and dendrites arranged in a plane transverse to the folium. Synonym(s): Purkinje corpusclesPurkinje conduction - conduction of the cardiac impulse through the Purkinje system.Purkinje corpuscles - Synonym(s): Purkinje cellsPurkinje effect - Synonym(s): Purkinje phenomenonPurkinje fibers - interlacing fibers formed of modified cardiac muscle cells that are the terminal ramifications of the conducting system of the heart found beneath the endocardium of the ventricles.Purkinje figures - shadows of the retinal vessels seen as dark lines on a reddish field when a light enters the eye through the sclera and not the pupil.Purkinje image trackerPurkinje images - Synonym(s): Purkinje-Sanson imagesPurkinje layer - the layer of Purkinje cells between the molecular and granular layers of the cerebellar cortex. Synonym(s): piriform neuron layerPurkinje network - the network formed by Purkinje fibers beneath the endocardium.Purkinje phenomenon - in the light-adapted eye, the region of maximal brightness is in the yellow; in the dark-adapted eye, the region of maximal brightness is in the green. Synonym(s): Purkinje effect; Purkinje shiftPurkinje shift - Synonym(s): Purkinje phenomenonPurkinje system - terminal ramifications in the ventricles of the specialized conducting system of the heart.Purkinje-Sanson images - the two images formed by the anterior and posterior surfaces of the cornea, and the two images formed by the anterior and posterior surfaces of the lens. Synonym(s): catatropic images; Purkinje images; Sanson imagesPurkinje shift Reduction in the luminosity of a red light relative to that of a blue light when the luminances are reduced from photopic to scotopic levels of illumination. This is due to the shift of the spectral sensitivity curve from a maximum at 555 nm to 507 nm when passing from light to dark adaptation. Syn. Purkinje's phenomenon. See photochromatic interval; duplicity theory. |