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The Journal of Neuroscience, March 15, 2001, 21(6):2131-2142
Selective Processing of Vestibular Reafference during Self-Generated Head Motion
Jefferson E. Roy and Kathleen E. Cullen Aerospace Medical Research Unit, McGill University, Montreal, Quebec, Canada H3G 1Y6
The vestibular sensory apparatus and associated vestibular nuclei are generally thought to encode head-in-space motion. Angular head-in-space velocity is detected by vestibular hair cells that are located within the semicircular canals of the inner ear. In turn, the afferent fibers of the vestibular nerve project to neurons in the vestibular nuclei, which, in head-restrained animals, similarly encode head-in-space velocity during passive whole-body rotation. However, during the active head-on-body movements made to generate orienting gaze shifts, neurons in the vestibular nuclei do not reliably encode head-in-space motion. The mechanism that underlies this differential processing of vestibular information is not known. To address this issue, we studied vestibular nuclei neural responses during passive head rotations and during a variety of tasks in which alert rhesus monkeys voluntarily moved their heads relative to space. Neurons similarly encoded head-in-space velocity during passive rotations of the head relative to the body and during passive rotations of the head and body together in space. During all movements that were generated by activation of the neck musculature (voluntary head-on-body movements), neurons were poorly modulated. In contrast, during a task in which each monkey actively "drove" its head and body together in space by rotating a steering wheel with its arm, neurons reliably encoded head-in-space motion. Our results suggest that, during active head-on-body motion, an efferent copy of the neck motor command, rather than the monkey's knowledge of its self-generated head-in-space motion or neck proprioceptive information, gates the differential processing of vestibular information at the level of the vestibular nuclei.
Key words: vestibular nucleus; self-motion; reafference; efference copy; gaze shift; gaze pursuit; vestibular reflexes; head-unrestrained
Copyright © 2001 Society for Neuroscience 0270-6474/01/2162131-12$05.00/0
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