A Man and His Son Are Riding Along a Tree-Lined

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The Answer is Optic flow is a critical cue to depth when a person is driving, though it also operates, of course, when the person is moving more slowly through a scene. In this scenario, the man, in his peripheral vision, can see the landscape at the side of the car whizzing by in a blur and disappearing out the edges of his field of view. The more distant landscape flows outward more slowly. Only the point where he is heading (the focus of expansion) remains stationary in his retinal image. He also can use linear perspective to gauge the trees receding in the distance. Looking outside the window, his son experiences that more distant objects move more slowly across his retina than nearby objects. This refers to motion parallax. The son observes that the nearby trees are passing quickly and the distant elements of the landscape remain almost still. Deletion and accretion also occur as the trees and other objects are covered and uncovered with the movement of the car.

A Man and His Son Are Riding Along a Tree-Lined

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