The principle that two stimuli must differ by a constant minimum percentage for their difference to be perceived is known as
A) prosopagnosia.
B) Weber's law.
C) signal detection.
D) sensory adaptation.

Question

Quizplus · Accepted Answer

This principle is known as Weber's law, which states that the difference threshold (or just noticeable difference) for a stimulus is proportional to the magnitude of the stimulus. In other words, the larger the stimulus, the larger the difference needed to be perceived as different. This is often expressed as a constant percentage (known as Weber's fraction) of the original stimulus.

The Principle That Two Stimuli Must Differ by a Constant