What does Weber's law indicate about the ability to detect changes in stimulus intensity?

Weber's law indicates that the ability to detect changes in stimulus intensity is proportional rather than absolute. Specifically, it posits that the just noticeable difference (JND) between two stimuli is a constant ratio of the original stimulus intensity. This means that the greater the intensity of the stimulus, the larger the change needed for a person to notice a difference. This principle applies across various types of stimuli, not limited to one specific type of sensory perception, and helps explain why we are better at detecting changes in lower intensity stimuli than in higher intensity ones.

This understanding is fundamental to sensory perception, reinforcing the idea that relative differences matter more to our perception than absolute values. The JND is a critical concept in fields like psychophysics, influencing research and practical applications in areas like product design and advertising, where understanding perceptual thresholds can have significant implications.