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Motion Parallax

Relative motion, also known as motion parallax , can be seen by looking out a window and moving your head from side to side. Notice that objects near you appear to move a sizable distance as your head moves. In comparison, trees, houses, and telephone poles at a greater distance appear to move slightly in relation to the background. Distant objects like hills, mountains, or clouds donÍt seem to move at all. Not really a pictorial cue except in movies, television, or animated cartoons. However, when it is present, depth is almost always perceived. Much of the apparent depth of a good movie comes from the relative motion of objects captured by the camera. People who can only see with one eye depend heavily on motion parallax. Often, they make frequent head movements to exaggerate parallax and improve depth perception.

[Coon, Dennis. Introduction to Psychology, Exploration and Application. St. Paul: West Publishing Company, 1989. See chapter on Perceiving.]

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