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Noun: just-noticeable difference
  1. (psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected
    "The experiment aimed to determine the just-noticeable difference in pitch perception";
    - jnd

Derived forms: just-noticeable differences

Type of: difference limen, difference threshold, differential limen, differential threshold

Encyclopedia: Just-noticeable difference