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Primate Translational Vestibuloocular Reflexes. III. Effects of Bilateral Labyrinthine Electrical Stimulation
 

Summary: Primate Translational Vestibuloocular Reflexes. III. Effects of
Bilateral Labyrinthine Electrical Stimulation
DORA E. ANGELAKI, M. QUINN MCHENRY, J. DAVID DICKMAN, AND ADRIAN A. PERACHIO
Department of Surgery (Otolaryngology) and Anatomy, University of Mississippi Medical Center, Jackson, Mississippi
39216-4505; and Department of Otolaryngology and Anatomy, University of Texas Medical Branch, Galveston, Texas 77550
Angelaki, Dora E., M. Quinn McHenry, J. David Dickman, and
Adrian A. Perachio. Primate translational vestibuloocular reflexes.
III. Effects of bilateral labyrinthine electrical stimulation. J. Neuro-
physiol. 83: 16621676, 2000. The effects of functional, reversible
ablation and potential recruitment of the most irregular otolith affer-
ents on the dynamics and sensitivity of the translational vestibuloocu-
lar reflexes (trVORs) were investigated in rhesus monkeys trained to
fixate near and far targets. Translational motion stimuli consisted of
either steady-state lateral and fore-aft sinusoidal oscillations or short-
lasting transient lateral head displacements. Short-duration (usually
2 s) anodal (inhibitory) and cathodal (excitatory) currents (50100
A) were delivered bilaterally during motion. In the presence of
anodal labyrinthine stimulation, trVOR sensitivity and its dependence
on viewing distance were significantly decreased. In addition, anodal
currents significantly increased phase lags. During transient motion,

  

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

 

Collections: Biology and Medicine