Granit , Ragnar Arthur
(1900–1991) Finnish neurophysiologist
Born in the Finnish capital of Helsinki, Granit qualified as a physician from the university there in 1927. He taught at the university from 1927 until 1940, serving as professor of physiology from 1935. In 1940 he moved to the Karolinska Institute, Stockholm, becoming professor of neurophysiology at the newly founded Medical Nobel Institute in 1946.
In a long career Granit has been a prolific writer on all aspects of the neurophysiology of vision. He demonstrated that light not only stimulates but can also inhibit impulses along the optic nerve. By attaching microelectrodes to individual cells in the retina he showed that color vision does not simply depend on three different types of receptor (cone) cells sensitive to different parts of the spectrum. Rather, some of the eye's nerve fibers are sensitive to the whole spectrum while others respond to a much narrower band and so are color specific.
Granit described his work in Sensory Mechanisms of the Retina(1947) and The Visual Pathway (1962); for such research he shared the 1967 Nobel Prize for physiology or medicine with George Wald and Haldan Hartline. Granit also did important work on the control of muscle spindles by the gamma fibers.

Scientists. . 2011.

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  • Granit, Ragnar Arthur — born Oct. 30, 1900, Helsinki, Fin. died March 12, 1991, Stockholm, Swed. Finnish born Swedish physiologist. His dominator modulator theory states that in addition to the retina s three kinds of cone cells, which respond to different colours,… …   Universalium

  • Granit, Ragnar Arthur — (30 oct. 1900, Helsinki, Finlandia–12 mar. 1991, Estocolmo, Suecia). Fisiólogo sueco, nacido en Finlandia. Su teoría del dominador modulador establece que, además de los tres tipos de conos de la retina, que responden a diferentes colores,… …   Enciclopedia Universal

  • Ragnar Arthur Granit — (* 30. Oktober 1900 in Helsinki, Finnland; † 12. März 1991 in Stockholm, Schweden) war ein finnisch schwedischer Neurophysiologe und Nobelpreisträger. Granit lieferte wesentliche Arbeiten über die chemisch physiologischen Vorgänge in der Netzhaut …   Deutsch Wikipedia

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  • Ragnar Granit — Infobox Scientist name = Ragnar Arthur Granit image size = 150px caption = Ragnar Arthur Granit birth date = October 30, 1900 birth place = Vantaa, Finland death date = death date and age|1991|3|12|1900|10|30 death place = Stockholm, Sweden… …   Wikipedia

  • Granit — Gra|nit [gra ni:t], der; s, e: ein sehr hartes, körnig wirkendes Gestein: eine Balustrade aus Granit. * * * Gra|nit 〈a. [ nı̣t] m. 1; Min.〉 Tiefengestein aus fein bis grobkörnigen Teilen von Feldspat, Quarz u. Glimmer ● er ist fest, hart wie… …   Universal-Lexikon

  • Arthur — /ahr theuhr/, n. 1. Chester Alan, 1830 86, 21st president of the U.S. 1881 85. 2. legendary king in ancient Britain: leader of the Knights of the Round Table. 3. a male given name. * * * (as used in expressions) Port Arthur Adamov Arthur Arthur s …   Universalium

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  • Ragnar Granit — Saltar a navegación, búsqueda Ragnar Arthur Granit (30 de octubre de 1900, Helsinki, Finlandia – 12 de marzo de 1991, Estocolmo, Suecia) fue un científico finés que ganó el Premio Nobel de Fisiología o Medicina en 1967 junto con Haldan Keffer… …   Wikipedia Español

  • Ragnar Granit — Ragnar Arthur Granit (* 30. Oktober 1900 in Helsinki, Finnland; † 12. März 1991 in Stockholm, Schweden) war ein finnisch schwedischer Neurophysiologe und Nobelpreisträger. Granit lieferte wesentliche Arbeiten über die chemisch physiologischen… …   Deutsch Wikipedia

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