Gustav Fechner  

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Kunstformen der Natur (1904) by Ernst Haeckel
Kunstformen der Natur (1904) by Ernst Haeckel

Gustav Theodor Fechner (April 19, 1801 – November 18, 1887), was a German experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics, he inspired many 20th century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological sensation and the physical intensity of a stimulus via the formula: "S = K Log I".


In 1871 Fechner reported the first empirical survey of coloured letter photisms among 73 synesthetes.

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