Keegan notices that his favourite 55-cent chocolate bar seems lighter than usual, so he checks the label and finds that it is lighter by 10 grams. He decides to buy a larger candy bar instead and doesn't notice that the 99-cent chocolate bar also is lighter than it used to be by 10 grams. Keegan's behaviour illustrates the fact that:

Question

Quizplus · Accepted Answer

The larger a weight is, the greater the change must be before one can detect a difference, as per Weber's Law, which suggests that the just noticeable difference (jnd) is a constant proportion of the original stimulus size. Keegan's inability to notice the weight reduction in the larger candy bar illustrates this principle.

Keegan Notices That His Favourite 55-Cent Chocolate Bar Seems Lighter