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Department of Neurobiology, Pharmacology, and Physiology, University of Chicago, Chicago, Illinois 60637, USA. ramccrea@uchicago.edu
The vestibular nerve sends signals to the brain that code the movement and position of the head in space. These signals are used by the brain for a variety of functions, including the control of reflex and voluntary movements and the construction of a sense of self-motion. If many of these functions are to be carried out, a distinction must be made between sensory vestibular signals related to active head movements and those related to passive head movements. Current evidence is that the distinction occurs at an early stage of sensory processing in the brain, and the results are evident in the firing behavior of neurons in the vestibular nuclei that receive direct inputs from the vestibular nerve. Several specific examples of how sensory information related to passive and active head movements is transformed in the vestibular nuclei are discussed.
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