Akademik

jnd
noun
(psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected
Syn: ↑just-noticeable difference
Topics: ↑psychophysics
Hypernyms: ↑difference threshold, ↑differential threshold, ↑difference limen, ↑differential limen

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abbreviation
just noticeable difference

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JND (no periods) or j.n.d.,
just noticeable difference (used in scientific experiments to indicate a psychological or physiological threshold).

Useful english dictionary. 2012.