Gustav Theodor Fechner
(1801—1887) German physicist and psychologist
German psychophysicist, and one of the founders of experimental psychology. Fechner studied physiology, but turned to physics which he taught at Leipzig. Philosophically Fechner defended a monism in which the one world can be seen in one way physically and in the other mentally (his analogy was with a line that from one point of view traces a convex curve; from another a concave curve). Experimentally he sought to confirm this insight by discovering close quantitative relationships between conscious experience and physiological stimulus, eventually discovering the law that the intensity of a sensation increases as the log of the stimulus (S=k log R) characterizing psychophysical relations. His Element der Psychophysik (1860) is often supposed to mark the beginning of experimental psychology.