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Karl Ewald Konstantin Hering (August 5, 1834 – January 26, 1918) was a German physiologist who did much research into color vision, binocular perception and eye movements. He proposed opponent color theory in 1892. Born in Alt-Gersdorf, Kingdom of Saxony, Hering studied at the University of Leipzig and became a professor at Charles University in Prague. ==Color theory== Hering disagreed with the leading theory developed mostly by Thomas Young, James Clerk Maxwell and Hermann von Helmholtz. Young proposed that colors are based on three primary colors: red, green, and purple (or blue). Maxwell demonstrated that any color can be matched by a mix of 3 primary colors. This has been interpreted by Helmholtz as a proof that humans perceive colors through 3 types of receptors while white and black would reflect the amount of light. Hering instead believed that the visual system worked based on a system of color opponency. He had little empirical evidence to support this claim. In this model colors are perceived through receptors sensitive to three couples of opponent colors: red-green, yellow-blue and white-black. Later on Erwin Schrödinger demonstrated that the first and the second model are mathematically equivalent. But nowadays, we know that if the human possesses indeed 3 types of receptors as proposed by Young, Maxwell, and Helmholtz, they are then combined in 3 opponent channels as proposed by Hering. In their way, both Hering and Helmholtz were right. According to Granzier and Gegenfurtner (2012), in 1878 Hering coined the term ''memory color'' for the color one experiences when looking at a black-and-white image of some object that has a typical colour, such as yellow from the image of a banana. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ewald Hering」の詳細全文を読む スポンサード リンク
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