Which of the following is being measured if a subject is presented with a series of light bulb pairs of different wattages and is asked whether the members of each pair differ in brightness?

Question

Quizplus · Accepted Answer

The subject's ability to distinguish the difference in brightness between two light bulbs of different wattages is measuring their just noticeable difference (JND) for brightness. The JND is the minimum amount of difference between two stimuli that is detectable 50% of the time. It is a measure of sensitivity to differences and is related to the concept of Weber's law. The other options are not relevant to this particular task, as visual acuity refers to the sharpness of vision, absolute threshold is the minimum amount of stimulation needed to detect a stimulus, and physical intensity difference is simply the difference in physical characteristics of the two stimuli.

Which of the Following Is Being Measured If a Subject