山梨医科大学雑誌　第10巻2号　071-076(1995)

Time Course of Cerebellar Flocculus Visual Complex Spike Responses

Yu SATO, Hiroaki FUSHIKI, and Tadashi KAWASAKI

Abstract: It is well known that the flocculus complex spike (CS) is driven by retinal slip. We studied the time course of visual CS responses in the anesthetized and paralyzed cat. Onset of contralaterally-directed constant-velocity visual-pattern rotation evoked an initial increase in the CS rate, which gradually decreased but continued to remain above the spontaneous activity level during rotation periods as long as 50s (onset response). Then, cessation of the rotation caused a decrease in the CS rate, which gradually returned to the spontaneous rate (cessation response). Ipsiversive rotation caused a similar CS time course with an inverse response-polarity. The duration of the cessation response increased with increases in the stimulus duration. Acceleration and deceleration of retinal slip velocity did not affect the time course of the responses. Thus, the flocculus CS is modulated time-dependently during the onset and cessation phases of retinal slip regardless of retinal-slip stimulus parameters such as velocity and acceleration. It is concluded that the flocculus CS encodes time information of the retinal-slip onset and cessation but does not encode precise quantitative information of the retinal-slip velocity and acceleration.

Key words: cat, cerebellum, climbing fiber response




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