The principle that two stimuli must differ by a constant minimum proportion for their difference to be perceived is known as

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Weber's law states that the difference threshold, or the minimum difference between two stimuli that can be detected, is proportional to the magnitude of the stimuli. This means that for heavier weights or brighter lights, the difference threshold will be larger than for lighter weights or dimmer lights. This principle is also known as the just noticeable difference (JND).

The Principle That Two Stimuli Must Differ by a Constant