Gustav Fechner

German experimental psychologist, physicist, and philosopher (1801–1887)

Gustav Theodor Fechner (German: [ˈfɛçnɐ]; 19 April 1801 – 18 November 1887) was a German physicist, philosopher, and experimental psychologist. A pioneer in experimental psychology and founder of psychophysics (techniques for measuring the mind), 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 ln ⁡ I {\displaystyle S=K\ln I} , which became known as the Weber–Fechner law.

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