and motion parallax I have found in teaching that perhaps the most confusing areas of perception textbooks are those concerning motion parallax and its relationship to stereopsis. The one fact that all books agree on is that these two depth cues are based on very similar geometry, both depending on differences in the perspective view of a scene when it is viewed from different vantage points. In stereopsis, the scene is viewed from two vantage points simultaneously. In motion parallax, from two (or more) successive vantage points. So far so good. Why is it then that these two seemingly equivalent ways of registering the world from different vantage points are described so differently from each other in textbook accounts? For stereoscopic vision, crossed and uncrossed disparity are the major descriptive terms. For motion parallax, there are two definitions. One is that objectsmoveagainstthe movementoftheheadtoadegreethatdepends ontheir distance fromtheobserver.Theother isthatmovementagainsttheheadoccursatdistancesnearer than the fixation point and movement with the head at further distances. Few, if any, textbooksexplaintherelationshipbetweenthesetwoaspectsofmotionparallax,andeve
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