Gustav_Fechner

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.