# Weber-Fechner law

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## We·ber-Fech·ner law

the intensity of a sensation varies by a series of equal increments (arithmetically) as the strength of the stimulus is increased geometrically; if a series of stimuli are applied and so adjusted in strength that each stimulus causes a perceptible change in intensity of the sensation, then the strength of each stimulus differs from the preceding one by a constant fraction. Thus, if a perceptible change in a visual sensation is produced by the addition of 1 candle to an illumination with an original strength of 100 candles, then 10 candles will be required to produce a perceptible change in sensation in an illumination with an original strength of 1000 candles.

## We·ber-Fech·ner law

(vā'ber-fek'nĕr law)
The intensity of a sensation varies by a series of equal increments (arithmetically) as the strength of the stimulus is increased geometrically; if a series of stimuli is applied and so adjusted in strength that each stimulus causes a just-perceptible change in intensity of the sensation, then the strength of each stimulus differs from the preceding one by a constant fraction.
Synonym(s): Fechner-Weber law, Weber law.

or

## Fechner's law

a law stating that sensation increases arithmetically as the stimulus increases geometrically Named after Ernst Weber (see WEBERIAN OSSICLE and the German physicist Gustav Fechner (1801–87).

## Fechner,

Gustav T., German physicist, 1801-1887.
Fechner paradox - refers to apparent increase in brightness of a figure when viewed with one eye after first viewing with both eyes.
Fechner-Weber law - Synonym(s): Weber-Fechner law
Weber-Fechner law - see under Weber, Ernst Heinrich

## Weber,

Ernst Heinrich, German physiologist and anatomist, 1795-1878.
Fechner-Weber law - Synonym(s): Weber-Fechner law
Weber experiment - if the peripheral end of the divided vagus nerve is stimulated, the heart is arrested in diastole.
Weber law - Synonym(s): Weber-Fechner law
Weber paradox - if a muscle is loaded beyond its power to contract, it may elongate.
Weber-Fechner law - the intensity of a sensation varies by a series of equal increments as the strength of the stimulus is increased geometrically. Synonym(s): Fechner-Weber law; 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.
References in periodicals archive ?
D'Alconzo, "The logarithmic nature of QoE and the role of the weber-fechner law in QoE assessment," in Proc.
The objectives of the research described in this article were: 1) to perform evaluations of several compounds identified in either drinking water or algal samples; 2) to evaluate the application of the Weber-Fechner law in relating odor intensity to compound concentration, 3) to if odor descriptors ascribed to a homologous series changed either among the compounds or with changes in the compound concentration; and 4) calculate the OTCs of the odorous organic compounds.

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