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J Neurophysiol 75: 2658-2661, 1996;
0022-3077/96 $5.00
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Journal of Neurophysiology, Vol 75, Issue 6 2658-2661, Copyright © 1996 by APS

ARTICLES

Monosynaptic activation of medium-lead burst neurons from the superior colliculus in the alert cat

S. Chimoto, Y. Iwamoto, H. Shimazu and K. Yoshida
Department of Physiology, University of Tsukuba, Ibaraki, Japan.

1. Extracellular recordings were made from medium-lead burst neurons (MLBNs) in the paramedian pontomedullary reticular formation rostral and caudal to the abducens nucleus in the alert cat. 2. Single-pulse stimulation of the contralateral superior colliculus during intersaccadic intervals evoked no response in most MLBNs. When collicular stimulation was applied at the beginning of saccades, spikes of MLBNs were consistently evoked with short latencies. The shortest latency was 0.8 ms, indicating monosynaptic activation of MLBNs from the superior colliculus. 3. Results suggest that monosynaptic excitatory effects from the colliculus are concealed by inhibitory input from omnipause neurons (OPNs) during intersaccadic intervals and that the monosynaptic collicular activation is disclosed when this inhibition is removed by a pause in OPN activity at the beginning of saccades.


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