Weber fraction

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In psychophysics, a ratio, differing from one type of sensory experience to another, representing the smallest increment in the magnitude of a stimulus that can be detected under ideal testing conditions, and that is a constant for each type of sensation according to Weber's law. Its value has been determined experimentally as k = 1/62 for visual brightness discrimination, k = 1/333 for auditory pitch discrimination, k = 1/11 for auditory loudness discrimination, k = 1/53 for weight discrimination, and so on. See also Weber's law. [Named after the German psychophysiologist Ernst Heinrich Weber (1795–1878) who discovered it and published it in Latin in 1834 and in German in 1846]

Subjects: Psychology.

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