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

The difference threshold is defined as the smallest detectable difference between two stimuli, also known as the just noticeable difference (JND). The JND is typically determined by presenting two stimuli and asking the person to detect whether there is a difference between them. The degree of change that is required for the person to detect the difference 50% of the time is the difference threshold. This means that if the degree of change is smaller than the difference threshold, the person will not be able to detect the difference between the stimuli.