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The Journal of Neurophysiology Vol. 84 No. 6 December 2000, pp. 3067-3071
Copyright ©2000 by the American Physiological Society
RAPID COMMUNICATION
1Department of Neurology and 2Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York 10029; and 3Department of Computer and Information Science, Brooklyn College of the City University of New York, Brooklyn, New York 11210
Yakushin, Sergei B.,
Theodore Raphan, and
Bernard Cohen.
Context-Specific Adaptation of the Vertical Vestibuloocular
Reflex With Regard to Gravity. J. Neurophysiol. 84: 3067-3071, 2000. We determined whether head position
with regard to gravity is an important context for angular
vestibuloocular reflex (aVOR) gain adaptation. Vertical aVOR gains were
adapted with monkeys upright or on side by rotating the animals about
an interaural axis in phase or out of phase with the visual surround
for 4 h. When aVOR gains were adapted with monkeys upright, gain
changes were symmetrical when tested in either on-side position
(23 ± 7%; mean ± SD). After on-side adaptation,
however, gain changes were always larger when animals were tested in
the same on-side position in which they were adapted. Gain changes were
43 ± 16% with ipsilateral side down and 9 ± 8% with
contralateral side down. The context-specific effects of head position
on vertical aVOR gain were the same whether the gain was increased or
decreased. The data indicate that vertical aVOR gain changes are stored
in the context of the head orientation in which changes were induced. This association could be an important context for expressing the
adapted state of the aVOR gain during vertical head movement.
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