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Weber-Fechner law

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We·ber-Fechner law (vbr-)
n.
The principle that the intensity of a sensation varies by a series of equal arithmetic increments as the strength of the stimulus is increased geometrically. Also called Fechner-Weber law.
Weber-Fechner law
in stimulus-response relations the ratio of changes in stimulus strength which are perceptible to a basic strength of the same stimulus is constant.
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