Von Kries Coefficient Law In the

context of the phenomenon of chromatic adaptation (i.e., conditions where a colored stimulus is viewed following adaptation to another color and differs in appearance from the same stimulus seen without pre-exposure and, conversely, where numerous pairs of colors that ordinarily differ may look alike when they are viewed by eyes that have been previously adapted to different kinds of light), the von Kries coefficient law - named after the German physiologist Johannes von Kries (1853-1928) - states that the tri-stimulus values of all colors for one condition of adaptation bear fixed ratios to the corresponding tri-stimulus value for the visually equivalent colors observed under another condition of adaptation. However, in one case, D. L. MacAdam notes that his own experimental hypotheses - based on von Kries ' law - were not supported. Consequently, MacAdam hypothesizes the existence of different receptors whose responses are merged onto three channels in the nervous system: the so-called "trichromatic mechanism." See also ADAPTATION, PRINCIPLES/LAWS OF; COLOR VISION, THEORIES/LAWS OF; von KRIES' COLOR VISION THEORY; ZONE/ STAGE THEORIES OF COLOR VISION. REFERENCES

Kries, J. von (1905). Die gesichtsempfindungen. In W. Nagel (Ed.), Handbuch der physiologisches menchens. Braunschweig: Vieweg. MacAdam, D. L. (1956). Chromatic adaptation. Journal of the Optical Society of America, 46, 500-513.

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