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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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Brain Stem Control of Coordinated Eye-Head Gaze Shifts

Brain Stem Control of Coordinated Eye-Head Gaze Shifts

Chapter:
(p.356) Chapter 54 Brain Stem Control of Coordinated Eye-Head Gaze Shifts
Source:
The Head-Neck Sensory Motor System
Author(s):

R. David Tomlinson

Manohar Bance

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0054

Recent experiments have proven that the vestibulo-ocular reflex (VOR) does not simply sum with vestibular eye movement commands during combined eye-head gaze saccades. Instead, if VOR gain is measured during combined eye-head gaze shifts, the gain is found to be a function of amplitude, decreasing from near unity during small-amplitude saccades to near zero at large amplitudes. In spite of this observation, large-amplitude saccades remain precise even if the head is perturbed during the movement. Since the VOR is not functional during these perturbed saccades, the eye trajectory does not change in response to this perturbation. Instead, the maintenance of saccadic accuracy is made by the changes in the movement duration.

Keywords:   reflex, eye movement, accuracy, observation, large-amplitude saccades, perturbed saccades, eye trajectory

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