When discussing difference thresholds, what crucial concept does Weber's law bring up about stimulus perception?

Weber's law presents the concept that the perception of a difference between stimuli is based on a proportional change rather than a fixed amount. This means that the smallest detectable difference (or the just noticeable difference) is a fraction of the original stimulus. For instance, if you are holding a weight, a small increase in the weight will only be perceptible if it is a certain percentage of the total weight you are already holding.

This law highlights that as the magnitude of the original stimulus increases, the amount that must be added for a person to notice the difference also increases, maintaining a consistent ratio. Therefore, it supports the idea that differences in stimuli perception depend on a proportional relationship rather than a constant change. Understanding Weber's law is crucial in fields such as psychology and marketing, where recognizing how individuals perceive changes in stimuli can significantly affect their responses and decisions.