What is the principle that states the size of a just noticeable difference is a constant proportion of the size of the initial stimulus

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This principle is known as Weber's law, which states that the just noticeable difference between two stimuli is proportional to the magnitude of the stimuli. In other words, the larger the initial stimulus, the larger the difference must be for it to be noticeable. This law applies to various sensory modalities, including vision, hearing, and touch.

What Is the Principle That States the Size of a Just