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Sensory processing in the vestibular nuclei during active head movementsMany secondary vestibular neurons are sensitive to head on trunk rotation during reflex-induced and voluntary head movements. During passive whole body rotation the interaction of head on trunk signals related to the vestibulo-collic reflex with vestibular signals increases the rotational gain of many secondary vestibular neurons, including many that project to the spinal cord. In some units, the sensitivity to head on trunk and vestibular input is matched and the resulting interaction produces an output that is related to the trunk velocity in space. In other units the head on trunk inputs are stronger and the resulting interaction produces an output that is larger during the reflex. During voluntary head movements, inputs related to head on trunk movement combine destructively with vestibular signals, and often cancel the sensory reafferent consequences of self-generated movements. Cancellation of sensory vestibular signals was observed in all of the antidromically identified secondary vestibulospinal units, even though many of these units were not significantly affected by reflexive head on trunk movements. The results imply that the inputs to vestibular neurons related to head on trunk rotation during reflexive and voluntary movements arise from different sources. We suggest that the relative strength of reflexive head on trunk input to different vestibular neurons might reflect the different functional roles they have in controlling the posture of the neck and body.
Document ID
Document Type
Reprint (Version printed in journal)
Gdowski, G. T. (University of Chicago Illinois 60637, United States)
Boyle, R.
McCrea, R. A.
Peterson, B. W.
Date Acquired
August 22, 2013
Publication Date
January 1, 2000
Publication Information
Publication: Archives italiennes de biologie
Volume: 138
Issue: 1
ISSN: 0003-9829
Subject Category
Life Sciences (General)
Funding Number(s)
Distribution Limits
Non-NASA Center
NASA Discipline Neuroscience
NASA Program Biomedical Research and Countermeasures