just+noticeable+difference

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just noticeable difference phase-contrast microscope phase-difference microscope potential difference

Main Entry: just no·tice·able dif·fer·ence
Pronunciation: jst-nt--s-bl-dif-(-)rn(t)s
Function: noun
: the minimum amount of change in a physical stimulus required for a subject to detect reliably a difference in the level of stimulation