Weber-Fechner law

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Noun1.Weber-Fechner law - (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to the logarithm of the stimulus intensity; based on early work by E. H. Weber
law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"
psychophysics - the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects