Weber's law, the formulation of how much change in a stimulus is required for a subject to detect it, rests on the measurement of the

"Just Noticeable Difference".

Explanation:

According to my research on psycho-physics, I can say that based on the information provided within the question this rests on the measurement of the  "Just Noticeable Difference". Which is defined as the minimum amount that something needs to be changed in order for the observer to detect any sort of difference.

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answer; conditional stimulus will trigger a conditioned response;