Weber-Fechner Law


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Weber-Fechner Law

 

a basic law of psychophysics; determines the relationship between the intensity of sensa- tion and the force of a stimulus acting on a sensory organ. It is based on the observation of the German physiologist E. Weber, who established (1830-34) that it is a relative rather than absolute increase in the force of a stimulus (light, sound, weight pressing on the skin, and so on) that is perceived: ΔI /I = const. For example, with an original weight of 75 g pressing on the skin, man can sense an increase of 2.7 g; with an original mass of 150 g, he can sense an increase of 5.4 g. The German physicist G. Fechner (1858) analyzed the results of the research mathematically and derived the formula S = alnI + b (where S is the intensity of sensation, I is the force of the stimulus, and a and b are constants). The Weber-Fechner law is valid only at moderate stimulus intensities. It is considerably distorted at threshold or very great intensities.

References in periodicals archive ?
In other words, what is the difference between Steven's Power Law and the Weber-Fechner law when explaining the QoE/QoS relationship?
The leading digit percentages of sales contracts have statistically the same distribution predicted by Benford's Law and implied by the Weber-Fechner Law.
Today, this principle, which also plays a role in the Weber-Fechner law (fundamental psycho-physical law, the living system's logarithmic response to a stimulus), belongs to the generally accepted knowledge of medical statistics.
So we can use Weber-Fechner law [Javorskij, D'etlaf 1979; Weber-Fechner law] to establish a connection between the resources spent and the intensity of a motivation factor: