Weber-Fechner Law
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
Sensation intensity is proportional to the logarithm of stimulus intensity: stimuli must increase geometrically for subjective sensation to increase arithmetically.
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The Weber–Fechner laws are two related scientific laws in the field of psychophysics, known as Weber's law and Fechner's law. Both relate to human perception, more specifically the relation between the actual change in a physical stimulus and the perceived change. This includes stimuli to all senses…
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Perceived difference is proportional to the logarithm of stimulus intensity (ΔI/I = k, Weber fraction; S = k·log I, Fechner integration). That is, the larger the stimulus, the larger the increment needed to produce a just noticeable difference; absolute increments are not equivalent to perceived increments.
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Weber%E2%80%93Fechner_lawverified
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