+**Jnd** (Just-noticeable difference) is the smallest detectable change between two stimuli. It marks the precise point where a subtle shift in [sensation](/wiki/Sensation) becomes perceptible, a core concept in the study of [perception](/wiki/Perception) and its thresholds.
+## See also
+- [Weber's Law](/wiki/Weber%27s_Law)
+- [Absolute Threshold](/wiki/Absolute_Threshold)
+- [Sensory System](/wiki/Sensory_System)
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