In reality the motion is identical in both figures. Though the motion of the barberpole in the top figure appears to be downward, the motion appears to be both downward and rightward when viewed through an aperture in the bottom figure. It will only 'see' part of the barberpole shown above. A neuron in visual cortex has a limited receptive field. However, the actual motion is a rotation of the barberpole around its longer axis, which should have created a rightward motion. The stripes on the pole appear to move downward along the pole's longer axis. ![]() When a diagonally-striped pole is rotated around its longer axis, so that the stripes are moving in the direction of the pole's shorter axis, it nonetheless appears the stripes are moving in the direction of its longer axis. A well known example is the barberpole illusion. These issues become more apparent when we look at visual illusions involving motion. The problem of motion estimation generalizes to binocular vision when we consider occlusion or motion perception at relatively large distances, where binocular disparity is a poor cue to depth. Put differently, many 3D scenes will be compatible with a single 2D projection. The motion cues present in the 2D projection will by default be insufficient to reconstruct the motion present in the 3D scene. In monocular vision for example, the visual input will be a 2D projection of a 3D scene. The observer's visual input is generally insufficient to uniquely determine the 'true' velocity in a visual scene. ![]() Although this process appears straightforward to most observers, it has proven to be a difficult problem from a computational perspective, and extraordinarily difficult to explain in terms of neural processing. Motion perception is an aspect of spatial perception and is the process of inferring the speed and direction of elements in a scene based on visual input. The dorsal stream is responsible for detection of location and motion.įor the perception of ones own motion see: proprioception They originate from a common source in visual cortex. The dorsal stream (green) and ventral stream (purple) are shown. ![]() This banner appears on articles that are weak and whose contents should be approached with academic caution. Please help recruit one, or improve this page yourself if you are qualified. This article is in need of attention from a psychologist/academic expert on the subject.
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