Weber-Fechner law

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Weber-Fechner law is a law of psychophysics proclaimed by Ernst H. Weber (1795-1878), stating that the least noticeable increase in the intensity of a human sensation is always brought about by a constant proportional increase in the previous stimulus. Gustav T. Fechner (1801-1887) developed this into the Weber-Fechner law that to increase the intensity of a sensation in arithmetical progression, it is necessary to increase the intensity of the stimulus in geometric progression.[1]


  1. Percy L. Greaves, Jr. "Mises Made Easier ", 1974. Referenced 2014-08-25.