Dictionary of Biological Psychology
When the head is moved, the images of visual targets that lie at different distances from the EYE are displaced by different amounts, creating a relative motion between them that is referred to as motion parallax (or frequently, MONOCULAR PARALLAX). It has been demonstrated convincingly that this parallax is a sufficient cue, on its own, to DEPTH PERCEPTION. Striking impressions of 3-dimensional depth can be created in a flat 2-dimensional image that is composed of randomly placed dots if an appropriate shearing motion is introduced into the display, linked mechanically to movements of the head.
The depth impression that is created in this manner bears many similarities to that induced by STEREOPSIS.
Reference
Rogers B.J. & Graham M. (1979) Motion parallax as an independent cue for depth perception. Perception 8:125–134.
DAVID W.HEELEY
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