Gustav Fechner
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Gustav Fechner was a German scientist (1801-1887) who made important contributions to understanding how people perceive and respond to physical stimuli like light, sound, and touch. His work laid the foundation for experimental psychology and helped establish the scientific study of the relationship between the physical world and human sensation.
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Gustav Theodor Fechner (/ˈfɛxnər/; 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