Experimental Brain Research

, Volume 175, Issue 3, pp 471–484

Dynamics of the horizontal vestibuloocular reflex after unilateral labyrinthectomy: response to high frequency, high acceleration, and high velocity rotations

  • Soroush G. Sadeghi
  • Lloyd B. Minor
  • Kathleen E. Cullen
Research Article

Abstract

Loss of vestibular information from one labyrinth results in a marked asymmetry in the horizontal vestibuloocular reflex (VOR). The results of prior studies suggest that long-term deficits in VOR are more severe in response to rapid impulses than to sinusoidal head movements. The goal of the present study was to investigate the VOR following unilateral labyrinthectomy in response to different stimuli covering the full range of physiologically relevant head movements in macaque monkeys. The VOR was studied 1–39 days post-lesion using transient head perturbations (up to 12,000°/s2), rapid rotations (up to 500°/s), and sinusoidal rotations (up to 15 Hz). In response to rotations with high acceleration or velocity, both contra- and ipsilesional gains remained subnormal. VOR gains decreased as a function of increasing stimulus acceleration or velocity, reaching minimal values of 0.7–0.8 and 0.3–0.4 for contra and ipsilesional rotations, respectively. For sinusoidal rotations with low frequencies and velocities, responses to contralesional stimulation recovered within ∼ 4 days. With increasing velocities and frequencies of rotation, however, the gains of contra- and ipsilesional responses remained subnormal. For each of the most challenging stimuli tested (i.e., 12,000°/s2 transient head perturbations, 500°/s fast whole-body rotations and 15 Hz stimulation) no significant compensation was observed in contra- or ipsilesional responses over time. Moreover, we found that gain of the cervico-ocular reflex (COR) remained negligible following unilateral loss indicating that neck reflexes did not contribute to the observed compensation. VOR responses elicited by both sinusoidal and transient rotations following unilateral labyrinthectomy could be described by the same mathematical model. We conclude that the compensated VOR has comparable response dynamics for impulses and sinusoidal head movements.

Keywords

VOR Unilateral labyrinthectomy High frequency High acceleration High velocity 

Supplementary material

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Soroush G. Sadeghi
    • 1
  • Lloyd B. Minor
    • 2
  • Kathleen E. Cullen
    • 1
  1. 1.Department of Physiology, Aerospace Medical Research UnitMcGill UniversityMontrealCanada
  2. 2.Department of Otolaryngology-Head and Neck SurgeryJohns Hopkins University School of MedicineBaltimoreUSA

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