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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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Head-Shaking Nystagmus—A Tool to Detect Vestibular Asymmetries in Patients

Head-Shaking Nystagmus—A Tool to Detect Vestibular Asymmetries in Patients

Chapter:
(p.603) Chapter 98 Head-Shaking Nystagmus—A Tool to Detect Vestibular Asymmetries in Patients
Source:
The Head-Neck Sensory Motor System
Author(s):

Eberhard Koenig

Michael Fetter

Sachiko Takahashi

Johannes Dichgans

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0098

Head-shaking nystagmus (HSN) is a transient nystagmus which is a result of a unilateral peripheral hypofunction based on Ewald's second law. This law states that there will be a stronger response of a labyrinth to excitatory than to inhibitory inputs with high-velocity stimuli. This chapter aims to understand the degree to which the HSN may be explained by the two hypotheses — unilateral peripheral hypofunction or asymmetry of central velocity storage — and to evaluate the correlation between HSN and SPN. It is concluded that the horizontal head-shaking maneuver is a highly sensitive method for detecting vestibular asymmetries resulting from the unilateral vestibular hypofunction or imbalance in the central velocity storage.

Keywords:   head-shaking nystagmus, transient nystagmus, hypofunction, high-velocity stimuli, vestibular asymmetries, inhibitory inputs

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