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J Neurophysiol 68: 244-264, 1992;
0022-3077/92 $5.00
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Journal of Neurophysiology, Vol 68, Issue 1 244-264, Copyright © 1992 by APS

ARTICLES

Physiological and behavioral identification of vestibular nucleus neurons mediating the horizontal vestibuloocular reflex in trained rhesus monkeys

C. A. Scudder and A. F. Fuchs
Department of Physiology and Biophysics, University of Washington, Seattle 98195.

1. To describe in detail the secondary neurons of the horizontal vestibuloocular reflex (VOR), we recorded the extracellular activity of neurons in the rostral medial vestibular nucleus of alert, trained rhesus monkeys. On the basis of their activity during horizontal head and eye movements, neurons were divided into several different types. Position-vestibular-pause (PVP) units discharged in relation to head velocity, eye velocity, eye position, and ceased firing during some saccades. Eye and head velocity (EHV) units discharged in relation to eye velocity and head velocity in the same direction so that the two signals partially canceled during the VOR. Two cell types discharged in relation to eye position and velocity but not head velocity; other types discharged in relation to head velocity only. 2. The position in the neural path from the primary vestibular afferents to abducens motoneurons was examined for each type. Direct input from the vestibular nerve was indicated if the cell could be activated by shocks to the nerve at latencies less than or equal to 1.4 ms. A projection to abducens motoneurons was indicated if spike-triggered averaging of lateral rectus electromyographic (EMG) activity yielded responses with a sharp onset at monosynaptic latencies. 3. PVP neurons were the principal interneuron in the VOR "three-neuron arc." Eighty percent received primary afferent input, and 66% made excitatory connections with contralateral abducens motoneurons. Surprisingly few, approximately 11%, made inhibitory connections with ipsilateral abducens motoneurons. This imbalance in the ipsi- and contralateral projections was confirmed by measuring the EMG activity evoked by electrical microstimulation in regions where PVP neurons were located. 4. EHV neurons whose activity increased during contralaterally directed head or eye movements were also interneurons in the ipsilateral inhibitory pathway. Eighty-nine percent received ipsilateral primary afferent input, and 25% projected to ipsilateral abducens motoneurons. EHV neurons excited during ipsilateral movements received neither direct primary afferent input nor projected to either abducens nucleus. A small proportion of each of two other cell types having sensitivity to contralateral eye position made excitatory connections with contralateral abducens motoneurons. Other types rarely were activated from the eighth nerve or projected to the abducens nucleus. 5. The significance of the connections of VOR interneurons and the signals they convey is discussed for three situations: smooth pursuit of a moving target, suppression of the VOR, and the VOR itself. PVP neurons convey a signal with a ratio of eye position and velocity components that is inappropriate to drive motoneurons during pursuit or the VOR.(ABSTRACT TRUNCATED AT 400 WORDS)


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