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Gustav Fechner
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<p>Gustav Theodor Fechner was a German <a href="/facts/Physicist/cQcgvSIm">physicist</a>, <a href="/facts/Philosopher/Hyvzc54m">philosopher</a>, and experimental <a href="/facts/Psychologist/J4l4QdX2">psychologist</a>. A pioneer in <a href="/facts/Experimental_psychology/sFaxwsJo">experimental psychology</a> and founder of <a href="/facts/Psychophysics/yDPmvvGf">psychophysics</a> (techniques for measuring the <a href="/facts/Mind/Y5JhtFj4">mind</a>), he inspired many 20th-century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological <a href="/facts/Sense/n9kYQ3rf">sensation</a> and the physical intensity of a stimulus via the formula: S = K ln I {\displaystyle S=K\ln I} , which became known as the <a href="/facts/Weber%E2%80%93Fechner_law/K2dNPlbW">Weber–Fechner law</a>. </p>