Akademik

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

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noun
: the minimum difference perceptible in any part of a series of sensory qualities ordinarily determined by reference to the corresponding stimulus conditions : the smallest perceptible change in a stimulus situation

Useful english dictionary. 2012.