Chapter

Seeing motion-in-depth

Ian P. Howard

in Perceiving in Depth

Published in print February 2012 | ISBN: 9780199764167
Published online May 2012 | e-ISBN: 9780199949373 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199764167.003.0196

Series: Oxford Psychology Series

Seeing motion-in-depth

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Animals detect the motion of objects in depth so as to avoid approaching objects, navigate round objects, and pursue and catch prey. Motion in depth has two components. The first is how long it takes for an object to move a given distance. This is known as time-to-contact when the object is on a collision course. The second is the direction of motion. Perception of both components depends on motion of the retinal images. First, the image of an approaching object grows in size—it looms. Secondly, the images in the two eyes change in binocular disparity. Thirdly, the images in the two eyes differ in the way they move. This chapter deals with the signals used in the visual perception of objects moving in depth and the ways they are processed in the nervous system.

Keywords: time-to-contact; motion in depth; motion direction; looming

Chapter.  28236 words.  Illustrated.

Subjects: Neuroscience

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