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Motion detection is the ability of the visual system to detect motion in the visual field. Motion detection in its simplest form takes place in the retina, but more complex processes related to movement perception are thought to involve the extrastriate cortex.
Single-unit recording in primate cortical area MT shows surprising sensitivity to depth defined by dynamical perspective cues. Depth might then be computed through recurrent circuits involving signals downstream of MT.
In both fruitflies and vertebrates, signals from photoreceptor cells are immediately split into two opposing channels in the downstream neurons. This might facilitate the computation of visual motion. See Letter p.300