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University School of Medicine (Chief: Prof. M. Morimoto, M.D.)The Brain Research Institute, Niigata University School of Medicine (Instructor: Assist. Prof. N. Maruyama, M.D.) Ist Department of Physiology, Niigata University Scool of Medicine (Chief:Prof. A. Niizima, M.D.) Unitary activities were recorded from the supe- rior colliculus in the rabbit by means of super-fine microelectrodes during elicitation of optokinetic nystagmus.The recorded activities of 76 units were classified into the following 6 types.(1) In four units the frequency of discharges in-creased within a certain space of time during nys- tagmus regardless of its direction.There was a difference in the frequency or the discharge pattern between the discharges concurrent with nystagmus toward the left and those concur- rent with nystagmus toward the right.(2) In three units the frequency of discharges decreased during nystagmus toward either side.The degree and time of inhibition depended on each unit but on the direction of nystagmus.(3) In seven units the frequency of discharges increased within a certain space of time during nystagmus toward one direction but it did not change during nystagmus toward the other direction.In three of these 7 units the response consisted of a burst of spikes corresponding to the peak of the nystagmographic curve. In the other 4 the frequency of discharges increased during the slow phase of nystagmus.(4) In five units the frequency of discharges decreased during nystagmus toward one direction and did not change during nystagmus toward the other direction.(5) In one unit the frequency of discharges increased within a certain space of time during nystagmus toward the left, while it decreased within a certain space of time during nystgmus toward the right.(6) In 56 units the frequency of discharges did not change during nystagmus toward either direction.It was difficult to establish any relationship between anatomical location in the superior colliculus and these response types mentioned above.

UNITARY ACTIVITIES OF THE SUPERIOR COLLICULUS OF THE RABBIT DURING ELICITATION OF OPTOKINETIC NYSTAGMUS