Keegan notices that his favourite personal-sized bag of chips seems lighter than usual.He checks the label and finds that the bag contains 10g less than it used to.He decides instead to buy a family-sized bag of chips and doesn't notice that the family-sized bag is also 10g lighter.Keegan's inability to detect the difference in the larger bag demonstrates that
A)the just noticeable difference is not a reliable measure of psychophysiological judgment.
B)sensory adaptation can occur in the short time between holding one bag of chips and then the other.
C)difference thresholds are continually changing.
D)the larger a weight is,the greater the change must be before one can detect a difference.

Question

Quizplus · Accepted Answer

The phenomenon described is consistent with Weber's Law, which states that the just noticeable difference (JND) is a constant proportion of the original stimulus size, meaning that as the weight (or any stimulus magnitude) increases, the absolute difference needed to notice a change also increases. This is why Keegan could notice a 10g difference in the smaller bag but not in the larger one.

Keegan Notices That His Favourite Personal-Sized Bag of Chips Seems