Homer notices that his favourite 99-cent bag of chips seems lighter than usual and so he checks the label and finds that it is lighter by 15 grams. He decides to buy a larger bag instead and doesn't notice that the $1.49 bag also is lighter by 15 grams. Homer's behaviour illustrates the fact that:

Question

Quizplus · Accepted Answer

Homer's behaviour suggests that he was able to detect a difference in weight when it was relatively small (15 grams) for the smaller bag of chips, but was unable to detect the same difference when it was relatively larger (1.49 dollars) for the larger bag of chips. This is consistent with Weber's law, which states that the just noticeable difference (jnd) between two stimuli is proportional to the magnitude of those stimuli. In other words, the larger the initial stimulus, the larger the change must be in order to be noticeable (hence why Homer could detect a 15-gram difference in the smaller bag of chips but not in the larger one).

Homer Notices That His Favourite 99-Cent Bag of Chips Seems