Our perception of external movement relative to that of our own body and the ability to differentiate between self-induced and external movement is crucial for the huge range of complex behavioural motions of which we are capable: from crossing the deck of a ship at sea, to co-ordinating a forehand volley or catching a ball on the run. These tasks require integration of visual, vestibular, somatosensory, proprio-receptive, motor and even auditory systems. Cues to self-motion, such as the optic flow across the retina as the head moves or the change in apparent sound location, are critical for precision and orientation of the body and in co-ordinating compensatory movements, balance and motor programmes.
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