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- Young–Helmholtz_theory abstract "The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century) is a theory of trichromatic color vision – the manner in which the photoreceptor cells in the eyes of humans and other primates work to enable color vision. In 1802, Young postulated the existence of three types of photoreceptors (now known as cone cells) in the eye, each of which was sensitive to a particular range of visible light.Hermann von Helmholtz developed the theory further in 1850: that the three types of cone photoreceptors could be classified as short-preferring (blue), middle-preferring (green), and long-preferring (red), according to their response to the wavelengths of light striking the retina. The relative strengths of the signals detected by the three types of cones are interpreted by the brain as a visible color.For instance, yellow light uses different proportions of red and green, but little blue, so any hue depends on a mix of all three cones, for example, a strong blue, medium green, and low red. Moreover, the intensity of colors can be changed without changing their hues, since intensity depends on the frequency of discharge to the brain, as a blue-green can be brightened but retain the same hue. The system is not perfect, as it does not distinguish yellow from a red-green mixture, but can powerfully detect subtle environmental changes.The existence of cells sensitive to three different wavelength ranges (most sensitive to yellowish green, cyanish-green, and blue – not red, green and blue) was first shown in 1956 by Gunnar Svaetichin. In 1983 it was validated in human retinas in an experiment by Dartnall, Bowmaker, and Mollon, who obtained microspectrophotopic readings of single eye cone cells. Earlier evidence for the theory had been obtained by looking at light reflected from the retinas of living humans, and absorption of light by retinal cells removed from corpses.".
- Young–Helmholtz_theory thumbnail YoungHelm.jpg?width=300.
- Young–Helmholtz_theory wikiPageID "3746043".
- Young–Helmholtz_theory wikiPageLength "3876".
- Young–Helmholtz_theory wikiPageOutDegree "16".
- Young–Helmholtz_theory wikiPageRevisionID "687403172".
- Young–Helmholtz_theory wikiPageWikiLink Blue.
- Young–Helmholtz_theory wikiPageWikiLink Brain.
- Young–Helmholtz_theory wikiPageWikiLink Category:Hermann_von_Helmholtz.
- Young–Helmholtz_theory wikiPageWikiLink Category:Vision.
- Young–Helmholtz_theory wikiPageWikiLink Color_vision.
- Young–Helmholtz_theory wikiPageWikiLink Cone_cell.
- Young–Helmholtz_theory wikiPageWikiLink Green.
- Young–Helmholtz_theory wikiPageWikiLink Gunnar_Svaetichin.
- Young–Helmholtz_theory wikiPageWikiLink Hermann_von_Helmholtz.
- Young–Helmholtz_theory wikiPageWikiLink Human_eye.
- Young–Helmholtz_theory wikiPageWikiLink Photoreceptor_cell.
- Young–Helmholtz_theory wikiPageWikiLink Red.
- Young–Helmholtz_theory wikiPageWikiLink Retina.
- Young–Helmholtz_theory wikiPageWikiLink Thomas_Young_(scientist).
- Young–Helmholtz_theory wikiPageWikiLink Trichromacy.
- Young–Helmholtz_theory wikiPageWikiLink File:YoungHelm.jpg.
- Young–Helmholtz_theory wikiPageWikiLinkText "Young-Helmholtz trichromatic theory".
- Young–Helmholtz_theory wikiPageWikiLinkText "Young–Helmholtz theory".
- Young–Helmholtz_theory wikiPageWikiLinkText "theory of color vision".
- Young–Helmholtz_theory wikiPageWikiLinkText "trichromatic color theory".
- Young–Helmholtz_theory wikiPageWikiLinkText "trichromatic model".
- Young–Helmholtz_theory wikiPageUsesTemplate Template:Reflist.
- Young–Helmholtz_theory subject Category:Hermann_von_Helmholtz.
- Young–Helmholtz_theory subject Category:Vision.
- Young–Helmholtz_theory hypernym Theory.
- Young–Helmholtz_theory type Work.
- Young–Helmholtz_theory type Redirect.
- Young–Helmholtz_theory comment "The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century) is a theory of trichromatic color vision – the manner in which the photoreceptor cells in the eyes of humans and other primates work to enable color vision.".
- Young–Helmholtz_theory label "Young–Helmholtz theory".
- Young–Helmholtz_theory sameAs Q1257777.
- Young–Helmholtz_theory sameAs Теория_на_Йънг-Хелмхолц.
- Young–Helmholtz_theory sameAs Dreifarbentheorie.
- Young–Helmholtz_theory sameAs Youngi-Helmholtzi_värvitaju_teooria.
- Young–Helmholtz_theory sameAs Théorie_de_Young–Helmholtz.
- Young–Helmholtz_theory sameAs Teoria_di_Young-Helmholtz.
- Young–Helmholtz_theory sameAs ヤング=ヘルムホルツの三色説.
- Young–Helmholtz_theory sameAs Teoria_Younga-Helmholtza.
- Young–Helmholtz_theory sameAs m.09yrzm.
- Young–Helmholtz_theory sameAs Теория_цветоощущения_Гельмгольца.
- Young–Helmholtz_theory sameAs Q1257777.
- Young–Helmholtz_theory wasDerivedFrom Young–Helmholtz_theory?oldid=687403172.
- Young–Helmholtz_theory depiction YoungHelm.jpg.
- Young–Helmholtz_theory isPrimaryTopicOf Young–Helmholtz_theory.