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J Neurophysiol 69: 996-999, 1993;
0022-3077/93 $5.00
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Journal of Neurophysiology, Vol 69, Issue 3 996-999, Copyright © 1993 by APS

ARTICLES

Contribution of irregular semicircular canal afferents to the horizontal vestibuloocular response during constant velocity rotation

D. E. Angelaki and A. A. Perachio
Department of Otolaryngology, University of Texas Medical Branch, Galveston 77555.

1. The effects of constant anodal currents (100 microA) delivered bilaterally to both labyrinths on the horizontal vestibuloocular response (VOR) were studied in squirrel monkeys during steps of angular velocity in the dark. We report that bilateral anodal currents decreased eye velocity approximately 30-50% during the period of galvanic stimulation without a change in the time constant of VOR. The decrease in eye velocity, present during steps of angular velocity, was not observed during sinusoidal head rotation at 0.2, 0.5, and 1 Hz. The results suggest that responses from irregular vestibular afferents influence VOR amplitude during constant velocity rotation.


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