Weber-Fechner law

noun
We·ber-Fech·ner law | \ˈweb-ər-ˈfek-nər-, ˈvā-bər-ˈfeḵ-nər- \

Medical Definition of Weber-Fechner law 

: an approximately accurate generalization in psychology: the intensity of a sensation is proportional to the logarithm of the intensity of the stimulus causing it

called also Fechner's law

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