just noticeable difference

noun
just no·​tice·​able dif·​fer·​ence | \ ˌjəst-ˌnōt-ə-sə-bəl-ˈdif-(ə-)rən(t)s How to pronounce just noticeable difference (audio) \

Medical Definition of just noticeable difference

: the minimum amount of change in a physical stimulus required for a subject to detect reliably a difference in the level of stimulation

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