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Related Experiment Videos

Vestibulo-ocular reflex in eccentric rotation in squirrel monkeys.

N Takeda1, M Igarashi, I Koizuka

  • 1Department of Otolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, TX.

American Journal of Otolaryngology
|July 1, 1991
PubMed
Summary

Eccentric rotation (ECR) enhances the vestibulo-ocular reflex (VOR) gain by stimulating otolith organs, particularly the utricular maculae. This study suggests ECR is a valuable clinical tool for assessing otolith organ function.

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Area of Science:

  • Neuroscience
  • Vestibular System Physiology
  • Otolith Organ Function

Background:

  • The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements.
  • Eccentric rotation (ECR) involves head movement off the axis of rotation, creating linear acceleration.
  • The role of otolith organs in VOR modulation during ECR requires further investigation.

Purpose of the Study:

  • To investigate the effects of otolith organ stimulation by linear acceleration during ECR on VOR gain.
  • To determine if ECR enhances VOR gain compared to centric rotation (CR).
  • To explore the contribution of otolith organs and semicircular canals to VOR during ECR.

Main Methods:

  • Squirrel monkeys were subjected to ECR and CR at different frequencies (0.5 Hz and 1.0 Hz).

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  • VOR gain was measured with the head facing away from the rotation axis and tangentially.
  • Otolith organs were ablated (sacculectomy and utricular neurectomy), and semicircular canals were plugged to assess their roles.

    • Main Results:

    • ECR significantly enhanced VOR gain at 1.0 Hz when the head faced away from the rotation axis, but not at 0.5 Hz or when facing tangentially.
    • Following otolith organ ablation, ECR no longer increased VOR gain.
    • ECR induced horizontal eye movements in animals with plugged semicircular canals, suggesting otolith stimulation.

    Conclusions:

    • Tangential acceleration during ECR stimulates the utricular maculae, contributing to VOR gain enhancement.
    • The findings indicate synergistic interactions between otolith organs and semicircular canals in modulating VOR.
    • ECR is proposed as a clinically useful method for evaluating otolith organ function.