Unidirectional habituation of vestibulo-ocular responses by repeated rotational or optokinetic stimulations in the cat

Experimental Brain Research
Gilles ClémentR Schmid

Abstract

1. Unilateral habituation of the vestibulo-ocular reflex was produced in adult cats stimulated by repeated unidirectional velocity steps (vestibular training) or by a continuously moving visual surround (optokinetic training). -- 2. Unidirectional vestibular training produced a strong asymmetry of vestibulo-ocular responses (VOR). Responses to velocity steps applied to the "trained" labyrinth were decreased both in gain and in time-constant. This effect generalized to responses to sinusoidal oscillations (0.03 Hz to 0.1 Hz), i.e. to a stimulus not used during training. -- No spontaneous nystagmus was ever observed in spite of the dynamic VOR asymmetry. -- 3. Unilateral vestibular habituation produced by vestibular training appeared to be a long-lasting phenomenon. It was still present 10 days after the end of training. -- 4. Optokinetic responses were not affected by vestibular training. -- 5. Unidirectional optokinetic training produced an increase in the slow phase velocity of optokinetic nystagmus (OKN) by about 25% in both directions. This effect did not persist for more than a few minutes. A marked spontaneous nystagmus was recorded in the dark after each session of optokinetic training, with a slow phase in the direction ...Continue Reading

Citations

Jul 2, 2008·Experimental Brain Research·Gilles ClémentJean-Hubert Courjon
Sep 2, 2008·European Journal of Applied Physiology·Sébastien TanguyPierre Denise
Feb 24, 2001·Neural Networks : the Official Journal of the International Neural Network Society·T J Anastasio
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