Ewald Hering (full name Karl Ewald Konstantin Hering) (August 5, 1834 - January 26, 1918) was a German physiologist who did much research into color vision and spatial perception. Hering disagreed with the leading theory developed mostly by Thomas Young and Hermann von Helmholtz. Helmholtz's theory stated that the human eye perceived all colors in terms of three primary colors: red, green, and blue. Hering instead believed that the visual system worked based on a system of color opponency, a proposal now widely recognized as correct. August 5 is the 217th day of the year in the Gregorian calendar (218th in leap years), with 148 days remaining. ... Year 1834 (MDCCCXXXIV) was a common year starting on Wednesday (link will display the full calendar) of the Gregorian Calendar (or a common year starting on Monday of the 12-day slower Julian calendar). ... is the 26th day of the year in the Gregorian calendar. ... 1918 (MCMXVIII) was a common year starting on Tuesday of the Gregorian calendar (see link for calendar) or a common year starting on Wednesday of the Julian calendar. ... Physiology (in Greek physis = nature and logos = word) is the study of the mechanical, physical, and biochemical functions of living organisms. ... Color vision is the capacity of an organism or machine to distinguish objects based on the wavelengths (or frequencies) of the light they reflect or emit. ... Thomas Young, English scientist Thomas Young (June 13, 1773-May 10, 1829) was a English polymath, contributing to optics, physiology, and Egyptology, among other fields. ... Hermann Ludwig Ferdinand von Helmholtz (August 31, 1821 – September 8, 1894) was a German physician and physicist. ... A primary color is a color that cannot be created by mixing other colors in the gamut of a given color space. ... Opponent colors based on experiment. ...

Hering looked more at qualitative aspects of color and said there were six primary colors, coupled in three pairs: red-green, yellow-blue and white-black. Any receptor that was turned off by one of these colors, was excited by its coupled color. This results in six different receptors. It also explained afterimages. His theory was rehabilitated in the 1970s when Edwin Land developed the Retinex theory that stated that whereas Helmholtz's colors hold for the eye, in the brain the three colors are translated into six. Color is an important part of the visual arts. ... An afterimage is an optical illusion that occurs after looking away from a direct gaze at an image. ... Edwin Herbert Land (May 7, 1909 – March 1, 1991) was an American scientist and inventor. ... Color constancy is a feature of the human color-perception system which ensures that the perceived color of objects remains (almost) constant under varying light conditions. ... A human eye Eyes are organs of vision that detect light. ... Italic text // ahh addiing sum spiice iin hurr`` For other uses, see Brain (disambiguation). ...

His son, Heinrich Ewald Hering (1866-1948) attended the universities of Prague and Kiel, receiving his doctorate in 1893 at Kiel, where he worked in the institute for general and experimental pathology 1893-1898. He was habilitated for general and experimental pathology in 1895, becoming professor extraordinary in 1901, professor in 1903. In 1913 he followed a call to Cologne, as professor of physiology. Nickname: Motto: Praga Caput Rei publicae Location within the Czech Republic Coordinates: , Country Czech Republic Region Capital City of Prague Founded 9th century Government  - Mayor Pavel Bém Area  - City 496 km²  (191. ... Kiel ( ) is a city in northern Germany and the capital of the Bundesland Schleswig-Holstein. ... Year 1893 (MDCCCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 12-day slower Julian calendar). ... Year 1893 (MDCCCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 12-day slower Julian calendar). ... Year 1898 (MDCCCXCVIII) was a common year starting on Saturday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Monday of the 12-day-slower Julian calendar). ... Year 1895 (MDCCCXCV) was a common year starting on Tuesday (link will display full calendar) of the Gregorian calendar (or a common year starting on Sunday of the 12-day-slower Julian calendar). ... 1901 (MCMI) was a common year starting on Tuesday (link will display calendar) of the Gregorian calendar (or a common year starting on Wednesday of the 13-day-slower Julian calendar). ... 1900 (MCMIII) was a common year starting on Thursday (link will display calendar) of the Gregorian calendar or a common year starting on Friday of the 13-day slower Julian calendar. ... Year 1913 (MCMXIII) was a common year starting on Wednesday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 13-day-slower Julian calendar). ... For other uses, see Cologne (disambiguation). ...

Heinrich Hering was not a very popular man, but he was an important medical scientist, recognized for his thoroughness and stubbornness. His research concerns the normal and pathological physiology of the nervous system, muscles, heart, blood vessels and the autonomic nervous system. His work on the automatic regulation of the circulation by the pressoreceptor nerves earned him a recommendation for the Nobel Prize in physiology or medicine, but he did not receive it. The Human Nervous System A human being coordinates its nervous system, the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions. ... A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... The heart and lungs, from an older edition of Grays Anatomy. ... f you all The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... This article or section is in need of attention from an expert on the subject. ... List of Nobel Prize laureates in Physiology or Medicine from 1901 to the present day. ...

In 1861 The elder Hering described an optical illusion which now bears his name - Hering illusion. He also developed Hering's law of equal innervation to describe the conjugacy of saccades in animals. 1861 (MDCCCLXI) was a common year starting on Tuesday (link with display the full calendar) of the Gregorian calendar (or a common year starting on Thursday of the Julian calendar) // January 1 - Benito Juárez captures Mexico City January 2 - Friedrich Wilhelm IV of Prussia dies and is succeeded by... It has been suggested that this article or section be merged with illusion. ... Categories: Optical illusions ... Herrings law of equal innervation is used to explain the conjugacy of eye movements (saccades) in stereoptic animals. ...

References

• R. Steven Turner, In the eye's mind : vision and the Helmholtz-Hering controversy (1994, Princeton University Press).
• Who Named It?, Karl Ewald Konstantin Hering
• Who Named It?, Heinrich Ewald Hering