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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 and Optokinetic Asymmetries in the Ocular and Cervical Reflexes

Vestibular and Optokinetic Asymmetries in the Ocular and Cervical Reflexes

Chapter:
(p.208) Chapter 31 Vestibular and Optokinetic Asymmetries in the Ocular and Cervical Reflexes
Source:
The Head-Neck Sensory Motor System
Author(s):

Vito E. Pettorossi

Pierangelo Errico

Aldo Ferraresi

Francesco Draicchio

Rosa Maria Santarelli

Rosa Bruni

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0031

Asymmetries of the vertical optokinetic reflex (VOKR) and the vertical vestibulo-ocular reflex (VVOR) have been observed in many species. Gains of upward OKR slow phases were higher than those of downward OKR slow phases. An upward preponderance was also observed in the VVOR of cats. This difference between upward and downward eye responses has been shown to be largely affected by gravity. Gravity also affects the VVOR response because the animals should be pitched around the interaural axis to a 90-degree incline to reveal such vertical vestibular asymmetry. In this condition, the vertical canals were stimulated without activating the otolithic receptors since the direction of gravity's action on the maculae was constant.

Keywords:   vertical optokinetic reflex, vertical vestibulo-ocular reflex, slow phases, cats, eye responses, gravity

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