# 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.
Farlex Partner Medical Dictionary © Farlex 2012

## 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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

## 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