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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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Vestibulo-Ocular Reflex Inhibition Mechanism during Goal-Directed Saccades in Man

Vestibulo-Ocular Reflex Inhibition Mechanism during Goal-Directed Saccades in Man

Chapter:
(p.531) Chapter 84 Vestibulo-Ocular Reflex Inhibition Mechanism during Goal-Directed Saccades in Man
Source:
The Head-Neck Sensory Motor System
Author(s):

Denis Pélisson

Claude Prablanc

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0084

It has been shown from recent studies that concurrent head velocity affects gaze shift kinematics due to an inhibition of the VOR during the saccade in man. The goal of this study is to quantify the VOR-saccade interactions during small gaze shifts. A procedure of passive head rotation is thus designed to be able to quantify VOR gain associate with gaze shifts of even smaller amplitude. The main findings are summarized in the gaze velocity profiles. It was found that when saccadic response is executed when the head is moving in the same direction, gaze velocity is faster than when the head is fixed. Another finding is that the gaze shift duration is inversely related to gaze shift velocity.

Keywords:   VOR-saccade interactions, gaze shift duration, gaze shift velocity, goal-directed saccades, kinematics, gaze velocity, head velocity

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