电刺激蝙蝠小脑对中脑上丘神经元听反应的影响

实验在２３只成年中华鼠耳蝠（Ｍｙｏｌｉｓｃｈｉｎｅｎｓｉｓ）上进行。使用常规电生理学方法，观察了电刺激小脑对上丘神经元听反应的影响。在所观察的１７１个上丘神经元中，有１１６个（占６７．８４％）神经元听反应受到影响，其中７２个（占４２．１１％）表现为抑制效应，４４个（占２５．７３％）为易化效应。刺激小脑对上丘神经听反应的影响是双侧的。抑制或易化程度与电刺激强度、声刺激强度以及声、电刺激间隔有关。结果提示，小脑可以对上丘神经元听反应进行调制，这种调制作用可能是小脑调控回声定位过程中听觉－运动的中枢机制之一。

THE INFLUENCES OF ELECTRICAL STIMULATION OF BAT CEREBELLUM ON ACOUSTIC RESPONSES OF SUPERIOR COLLICULAR NEURONS

The influences of electrical stimulation of cerebellum on acoustically evoked responses of superiorcollicular SC) neurons were studied in 23 barbitarate-anesthetized bats, Myotis chinensis.Among 7] SC neurons observed, 116 neurons (67. 84%) were affected by cerebellum stimulation. Responses of 72 (42.11%) SC neurons were inhibited and 44 (25.73%) SC neurons were facilitated. The proportion of SC neurons affected by electrical stimulation of vermis was smaller than that of SC neurons affected by electrical stimulation of hemisphere or palaflocculus. The influence of cerebellum on auditory response of SC neurons was bilateral.The inhibitory and facilitatory degrees were dependent on the amplitude of both acoustic and electrical stimuli. Inhibition of SC neurons activity was also dependent on the the interval between the two stimuli. The best inhibitory latencies ranged from 4 to 28ms, and the mojority varied from 6 to 20ms. It is assumed that the influences of cerebellum on SC neurons are a part of the mechanisms of cerebellum to controll acoustic-motion during bat echolocating.