just noticeable difference
noun
just no·tice·able dif·fer·ence
ˌjəst-ˌnōt-ə-sə-bəl-ˈdif-(ə-)rən(t)s 
: 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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“Just noticeable difference.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/just%20noticeable%20difference. Accessed 15 Nov. 2024.
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