What is the relationship between the intensity of the stimulus and the intensity of the se...

Fechner said that for each of the human senses, there is always a relative increase, in the intensity of the stimulus, which produces observable response. Fechner gave the mathematical equation for the relationship between intensity of stimulus and intensity of sensation. The equation between the two is

In this equation, S represents magnitude of sensation, K is the constant, and R is the magnitude of the stimulus. The relationship is logarithmic one which increases geometrically and one increasing arithmetically.

Fechner earlier thought that his idea of mind and body had not been discussed by Weber. Fechner later said that his mathematical formula was already discussed by Weber in his own work. Fechner however, denies knowing any of this before he conducted his own experiments.