Fechner's Law

Fechner's law is a universal definition of a law of psychophysics formulated by physicist and biologist Hermann Hermann Fechner (1801 - 1882). According to Fechner's law, for two events of excitation of the nervous system - sensory stimulus and nervous excitation - the following formula is valid:

log E1 / E0 = 1/k log (I1/I0)

where E is the intensity of the stimulus, I is the perceived intensity, log is the logarithm, k is a proportionality constant depending on the property of the stimulus.

Thus, if we know the quantity that relates changes in stimulus intensity to