The principle that the just noticeable difference of any given sense is a constant fraction or proportion of the stimulus intensity being judged is called

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Weber's law states that the just noticeable difference (JND) is a constant proportion of the original stimulus. For example, if you can detect a 1oz weight difference on a 10oz object, you would need to detect a 2oz weight difference on a 20oz object in order for it to be considered a JND. This principle applies to all senses, including vision, hearing, and touch.

The Principle That the Just Noticeable Difference of Any Given