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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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Mechanism for Voluntary Cancellation of the Vestibulo-ocular Reflex in Squirrel Monkeys That Is Not Related to Smooth Pursuit

Mechanism for Voluntary Cancellation of the Vestibulo-ocular Reflex in Squirrel Monkeys That Is Not Related to Smooth Pursuit

Chapter:
(p.536) Chapter 85 Mechanism for Voluntary Cancellation of the Vestibulo-ocular Reflex in Squirrel Monkeys That Is Not Related to Smooth Pursuit
Source:
The Head-Neck Sensory Motor System
Author(s):

Robert A. Mccrea

Kathleen E. Cullen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0085

The vestibulo-ocular reflex (VOR) is reduced or cancelled by a smooth pursuit eye movement programmed to match the velocity of the moving target whenever there is an attempt made to follow a moving visual target by combining a smooth pursuit eye movement with a head movement generated in the direction of target movement. The objective of this study is to determine if there is a second mechanism that can cancel the VOR. The experiments in this study involved four squirrel monkeys that were prepared for chronic recording of eye movements. The monkeys were seated on a vestibular turntable with restrained heads. Their eye movements were recorded using magnetic search coil technique. Results showed that there is a cancellation of the vestibulo-ocular reflex generated by the sudden turntable jerks. There is also a cancellation of the vestibulo-ocular reflex produced by the unpredictable head movements.

Keywords:   vestibulo-ocular reflex, coil technique, squirrel monkeys, eye movements, visual target, velocity

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