Abstract
The effects of substantia nigra (SN) stimulation to the activity of the ipsilateral superior colliculus (SC) have been studied in the rat. Two types of responses were observed: pure inhibitions or excitation sometimes followed by an inhibitory period. The comparison between the latency of these various orthodromic responses and the conduction time of the nigro-tectal fibers, as determined by antidromic activation, led us to conclude that there is a possible inhibitory function of the nigro vectal pathway. The problem of coactivation of pedunculus cerebri (Ped) and tractus opticus (To) fibers is discussed.
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