The difference threshold is the degree of change that is required in order for a person to detect a change ________ percent of the time.
A) 25
B) 75
C) 50
D) 100

Question

The difference threshold is the degree of change that is required in order for a person to detect a change ________ percent of the time.
A) 25
B) 75 
C) 50 
D) 100

Quizplus · Accepted Answer

The correct answer is 50 because the difference threshold (also called the just noticeable difference) is defined as the smallest amount of change between two stimuli that is detectable 50% of the time. In other words, if a change is below the difference threshold, it is not noticeable; if it is above the difference threshold, it is noticeable.

The Difference Threshold Is the Degree of Change That Is