You probably can detect a weight difference between a 1-ounce and a 2-ounce envelope.But if you pick up a 20-pound package,you'd probably need another package that weighs at least 20.5 pounds before detecting a difference between them.This description illustrates:
A)Weber's law.
B)signal detection theory.
C)absolute thresholds.
D)perceptual constancy.

Question

Quizplus · Accepted Answer

Weber's law states that the just noticeable difference (JND) between two stimuli is based on a constant proportion of the original stimulus. In other words, the difference needs to be a certain percentage or fraction of the original stimulus in order for a person to detect it. This is observed in the example given in the question, where a weight difference between a 1-ounce and a 2-ounce envelope can be detected, but a weight difference between a 20-pound package and a 20.5-pound package is needed to be detectable, which follows Weber's law.

You Probably Can Detect a Weight Difference Between a 1-Ounce