Characterization of the vestibulo-ocular reflex evoked by high-velocity movements

The Laryngoscope
François D Roy, R D Tomlinson

Abstract

The horizontal angular vestibulo-ocular reflex (VOR) plays an important role in stabilizing images on the retina throughout head rotations. Current evidence suggests that the VOR behaves linearly at low velocities and nonlinearly at high velocities. The aim of the research was to evaluate and characterize the normal behavior of the reflex evoked by high-velocity head rotations. Case control study. Manually applied head-thrust movements with peak velocities in the range of 100degrees to 500degrees/s and peak accelerations up to 7,000degrees/s were performed on normal volunteers. These head thrusts were comparable with those described in detail by Halmagi and coworkers. Eye and head movements were recorded using the magnetic search coil method. The gain of the VOR is linear at low velocities and saturates at head velocities greater than 350degrees/s. The values for the normal gain of the reflex were approximated by means of the area between two nonlinear functions. The directional difference parameter, exploring the symmetry of the reflex, indicated that the VOR in normal subjects is symmetric. The gain of the VOR in individuals with intact vestibular function is nonlinear at high angular head velocities. We propose a quantitativ...Continue Reading

References

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Citations

Nov 30, 2010·Experimental Brain Research·Matthew R SchererMichael C Schubert
Feb 3, 2007·Skull Base : Official Journal of North American Skull Base Society ... [et Al.]·Michael A TaplinJohn A Rutka
Feb 24, 2010·Journal of the Association for Research in Otolaryngology : JARO·Janine GoumansJohannes van der Steen
Aug 26, 2010·The Medical Clinics of North America·Joe Walter Kutz
Jul 16, 2016·Scandinavian Journal of Medicine & Science in Sports·T HeinenI Čuk
Oct 11, 2015·Clinical Otolaryngology : Official Journal of ENT-UK ; Official Journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery·C J YangH J Park
Sep 14, 2007·Acta Oto-laryngologica·Paul KesslerJohn Rutka
Jul 9, 2008·Acta Oto-laryngologica·Meeli HirvonenTimo Petteri Hirvonen
Jun 10, 2020·Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery·Zhuangzhuang LiDongzhen Yu
Nov 17, 2020·Clinical and Experimental Otorhinolaryngology·Seong Hoon BaeSung Huhn Kim

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