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The Head-Neck Sensory Motor System$
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Alain Berthoz, Werner Graf, and P. P. Vidal

Print publication date: 1992

Print ISBN-13: 9780195068207

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195068207.001.0001

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Vestibular Nerve Inputs to Vestibulospinal and Vestibulo-ocular Neurons of the Squirrel Monkey

Vestibular Nerve Inputs to Vestibulospinal and Vestibulo-ocular Neurons of the Squirrel Monkey

Chapter:
(p.255) Chapter 40 Vestibular Nerve Inputs to Vestibulospinal and Vestibulo-ocular Neurons of the Squirrel Monkey
Source:
The Head-Neck Sensory Motor System
Author(s):

Richard Boyle

Jay M. Goldberg

Stephen M. Highstein

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0040

Some vestibular nerve afferents have a regular spacing of action potentials; in others, the space is irregular. Fibers first classified as regularly or irregularly discharging also differ in their response dynamics to rotational stimuli. Among canal afferents, the responses of regular fibers parallel angular head velocity, whereas those of irregular afferents are more phasic and show a high-frequency gain enhancement together with a phase advance. Consider the vestibulo-ocular (VOR) and vestibulocollic (VCR) reflexes. The VOR is an open-loop reflex controlling a predominantly viscous load. The VCR is closed loop, the load is largely inertial, and neck muscles are more sluggish than are extraocular muscles.

Keywords:   vestibular nerve afferents, regular fibers, irregular afferents, angular head velocity, vestibulo-ocular neurons, vestibulocollic reflexes

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