Ernst Weber found that the magnitude of the just noticeable difference between two stimuli was always a systematic, absolute amount of 20%.

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Ernst Weber's law states that the just noticeable difference between two stimuli is a constant proportion of the stimuli rather than an absolute amount. This proportion is known as Weber's fraction and varies depending on the sensory modality and range of the stimuli.

Ernst Weber Found That the Magnitude of the Just Noticeable