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In psychophysics, a historically important law quantifying the perception of change in a given stimulus. Originated by the German physiologist Ernst Heinrich Weber (1795–1878) in 1834 and elaborated by his student Gustav Theodor Fechner, the law states that the change in a stimulus that will be just noticeable is a constant ratio of the original stimulus. It was later shown not to hold for extremes of stimulation.
Variants of WEBER'S LAW
Weber's law or Weber-Fechner law
This entry comes from Encyclopædia Britannica Concise. For the full entry on Weber's law, visit Britannica.com.