- 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 sensationPur·ky·ne or Purkinje 'pu̇r-kin-ye, -yā Jan Evangelista (1787-1869)Bohemian physiologist. Purkyne was a pioneering physiologist who made major contributions to histology, embryology, and pharmacology and whose discoveries considerably increased our understanding of the composition of cells, the functions of the brain and the heart, mammalian reproduction, and the phenomena of human vision. His best known discoveries include the large nerve cells in the cortex of the cerebellum that are known as Purkinje cells (1837) and the fibrous tissue that conducts the pacemaker stimulus along the inside walls of the ventricles to all parts of the heart (1839); the fibers are known as Purkinje fibers and make up Purkinje's network. He wrote his graduation dissertation in 1823 on the subjective phenomena of human vision. One such phenomenon is now known as the Purkinje phenomenon.
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Purkinje afterimage — Also referred to as Purkinje image and Bidwell s ghost. The eponym Purkinje afterimage refers to the Bohemian physiologist Johannes Evange lista Purkyne (1787 1869). It is used to denote a negative afterimage that appears secondly in a… … Dictionary of Hallucinations
purkinje afterimage — (ˌ)pərˈkin(ˌ)jē , ˈpu̇rkə̇nˌyā noun Usage: usually capitalized P Etymology: after Johannes E. Purkinje died 1869 Czech physiologist : a second positive afterimage in a succession of visual afterimages resulting from a brief light stimulus and… … Useful english dictionary
afterimage — Also referred to as aftersensation, afterimagery, and post image. All three terms are used to denote a group of visual percepts that occur in response to a primary light stimulus to the eye, typically noticed after the stimulus has been… … 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 image — see Purkinje afterimage … Dictionary of Hallucinations
Afterimage — For other uses, see Afterimage (disambiguation). If the viewer stares at this image for 20 60 seconds and stares at a white object a negative afterimage will appear (in this case being cyan on magenta). This can also be achieved by the viewer… … Wikipedia
Hering's afterimage — The eponym Hering s afterimage refers to the German psychologist and physiologist Karl Ewald Konstantin Hering (1834 1918). It is used to denote a positive afterimage that appears first in a temporal sequence of afterimages resulting from a… … Dictionary of Hallucinations
Hess afterimage — The eponym Hess afterimage refers to the German ophthalmologist Carl von Hess (1863 1923). It is used to denote a positive afterimage that appears third in a temporal sequence of afterimages resulting from a brief light stimulus. Hess… … Dictionary of Hallucinations
negative afterimage — Also known as Purkinje afterimage. The adjective negative refers to the fact that the colours of this type of * afterimage are complementary to the colours of the primary stimulus. The term negative afterimage is used in opposition to… … Dictionary of Hallucinations
postimagen de Purkinje — Eng. Purkinje s afterimage Segunda sensación visual positiva en la que el tono y características son complementarias a las de la primera sensación … Diccionario de oftalmología