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Viewing distance dependence of the vestibulo-ocular reflex during translation: extra-otolith influences
 

Summary: Viewing distance dependence of the vestibulo-ocular reflex
during translation: extra-otolith influences
Min Wei, Dora E. Angelaki *
Department of Neurobiology­­Washington University Medical School, 660 South Euclid, St. Louis, MO 63110, USA
Received 6 June 2003; received in revised form 16 November 2003
Abstract
Despite nearly perfect gaze stability during natural head movements, the amplitude of the vestibulo-ocular reflex during passive
head and body translation (TVOR) has been consistently reported to be undercompensatory during near target viewing. Here we
have compared the rhesus monkey TVOR during pure head and body translation with the eye movements generated during
eccentric yaw rotations, where both semicircular canal and otolith signals are activated. We found a significant increase in both the
near target TVOR amplitude and its viewing distance dependence during eccentric rotations, as compared to pure translations. We
conclude that the simultaneous activation of the horizontal semicircular canals result in an improvement of the viewing distance-
dependence of the rhesus monkey TVOR.
Ó 2004 Elsevier Ltd. All rights reserved.
Keywords: Linear VOR; Eye movement; Binocular; Vestibular; Vestibuloocular; Modelling; Otolith organs
1. Introduction
A phylogenetically novel gaze stabilization mecha-
nism that has evolved in parallel with foveal vision and
stereopsis is the translational vestibulo-ocular reflex
(TVOR). These vestibular-driven compensatory eye

  

Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis

 

Collections: Biology and Medicine