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JOURNALOFNEUROPHYSIOLOGY Vol. 72, No. 3, September 1994. Printed in C'.S.A.
 

Summary: JOURNALOFNEUROPHYSIOLOGY
Vol. 72, No. 3, September 1994. Printed in C'.S.A.
RAPID PUBLICATION
The Cerebellar Nodulqs and Ventral Uvula Control the Torsional
Vestibulo-Ocular Reflex
D. E. ANGELAKI AND B. J. M. HESS
Department of Neurology, University Hospital Zurich, CH-8091, Switzerland
SUMMARY AND CONCLUSIONS
I. The vestibulo-ocular reflex (VOR) was investigated in rhesus
monkeys before and after surgical ablation of the cerebellar nodu-
lus and ventral uvula. The lesion resulted in an alteration of the
torsional VOR: compensatory eye movements were poor in the
low frequency range and the time constant was reduced to values
comparable to those of primary semicircular canal afferents. In
addition, animals permanently lost their ability to generate tor-
sional optokinetic nystagmus (OKN).
2. The effects of the lesion on the torsional VOR differed from
those observed in the horizontal and vertical vestibulo-ocular sys-
tems. While the vertical VOR and OKN were unaltered, the hori-
zontal VOR and OKN were characterized by increased time con-

  

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

 

Collections: Biology and Medicine