THE INFLUENCES OF ELECTRICAL STIMULATION TO CEREBELLUM ON THE ACOUSTICALLY EVOKED RESPONSES OF INFERIOR COLLICULAR NEURONS ES BAT
电刺激蝙蝠小脑对下丘神经元听反应的影响

The influence of electrical stimulation to the cerebellum on acoustically evoked responses of inferior collicular (IC) neurons of 34 FM bats, Miniopterus schrebersi, was studied with conventional auditory physiological techniques. Among 515 1C neurons isolated, responses of 171 (33.30%) IC neurons were affected by cerebellar stimulation. Responses of 126 (24.46%) IC neurons were inhibited an 45 (8.74%) were facilitated. The degree of inhibition was dependent upon the amplitude of both acoustic and electrical stimuli. Inhibition of IC neuron's activity was also dependent upon the time interval between the two stimuli. Both best inhibitory and facilitatory latencies ranged between 6.0 to 37.0 msec, they varied not only among individual IC neurons, but also with the stimulating portion of the cerebellum. Responses of both contralateral and ispilateral IC neurons were affected. Our findings suggest that different portion of cerebellum affects the activity of IC neurons through different multi-synaptic pathways.