Noel bet Alexa $5 that he can make Alexa see a piece of gum in two different places without moving it. Alexa agrees to the bet. Noel holds the stick of gum about six inches in front of Alexa's face and tells her to close her eyes. Then Noel instructs Alexa to open one eye and remember where the gum is relative to other objects in the background. Next, he tells Alexa to close that eye and open the other one. Noel will win the $5 because of which depth cue?

Question

Quizplus · Accepted Answer

Retinal disparity is the depth cue that allows us to perceive depth because each eye sees a slightly different image. When Alexa opens one eye and then the other, the gum appears in different positions relative to the background, demonstrating retinal disparity.

Noel Bet Alexa $5 That He Can Make Alexa See