PMID: 490199Sep 1, 1979Paper

Neural correlates of nystagmus in abducens nerve

Journal of Neurophysiology
V HonrubiaP H Ward

Abstract

1. The firing rates of action potentials of abducens nerve single fibers were recorded in the cat's orbit during a variety of vestibular and optokinetic stimulations. 2. Comparison was made of the neural firing rates associated with agonist and antagonist responses during slow and fast components of vestibular and optokinetic nystagmus. It was found that the relationship between the motoneuron firing rates and the eye motion was independent of the reflex with which they were associated--vestibular or optokinetic, or the type of response--agonist or antagonist. No neurons were observed that responded only during the fast or only during the slow nystagmus phase. Motoneuron firing rates were proportional to both velocity and position of the eye in a ratio of 1 (spikes/s)/(deg/s) to 7.2 (spikes/s)/deg. The behavior of the motoneurons was compatible with the hypothesis that thier firing rates are sufficient to overcome both elastic and viscous forces by which the muscles and ligaments hold the eye in the orbit. 3. For low-frequency head rotations, eye displacement and neural responses showed a small phase angle difference. At higher frequencies, however, while the eyes maintained a fixed relationship to the head rotation, the neural...Continue Reading

Citations

May 1, 1987·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·C G Lau, V Honrubia
Jan 1, 1981·Annals of the New York Academy of Sciences·B W PetersonV J Wilson

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