In psychophysics, a just-noticeable difference, customarily abbreviated with lowercase letters as jnd, is the smallest detectable difference between a starting and secondary level of a particular sensory stimulus. It is also known as the difference limen or the differential threshold.
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“The difference between heresy and prophecy is often one of sequence. Heresy often turns out to have been prophecy—when properly aged.”
—Hubert H. Humphrey (1911–1978)