Brightness constancy occurs in part because
A) of failures in the visual system to deal with illumination changes.
B) the proportion of light an object reflects is constant.
C) brightness is a perceptual hypothesis.
D) of all of these.

Question

Quizplus · Accepted Answer

Brightness constancy refers to the ability to perceive the brightness of an object as constant despite changes in illumination. This is possible because the proportion of light an object reflects is constant, meaning that the ratio of the amount of light reflected to the amount of light falling on the object remains the same. Therefore, choice B is the best option as it correctly describes the reason for brightness constancy. Choice A is incorrect because brightness constancy occurs precisely because the visual system deals effectively with illumination changes. Choice C is partially correct but does not fully explain the phenomenon.

Brightness Constancy Occurs in Part Because