螽斯听觉中间神经元TN2的声反应特征以及GABA对其影响

采用单细胞电生理记录技术,对螽斯Ｇａｍｐｏｃｌｅｉｓ ｇｒａｔｉｏｓａ听觉双轴突中间神经元ＴＮ２的声反应放电活动的基本特征进行了观测,发现ＴＮ２的放电模式为“ｐｈａｓｉｃ”型,最敏感频率为１３ｋＨｚ,反应阈值为３１ｄＢ ＳＰＬ,是一个高灵敏、宽带通的神经元。还研究了抑制性神经递质ＧＡＢＡ及其拮抗剂苦毒素对ＴＮ２声反应的影响,发现ＧＡＢＡ能抑制ＴＮ２的放电活动,而苦毒素则将其放电模式改变为“ｔｏｎｉ

RESPONSE CHARACTERISTICS OF AUDITORY INTERNEURON TN2 IN THE BUSHCRICKET GAMPSOCLEIS GRATIOSA AND THE EFFECTS OF GABA

Intracellular electrophysiologyical technique was used to detect the response charactertics of the auditory intemeuron TN2 in the bushcricket Gampsocleis gratiosa. showing that the discharge pattern of TN2 is "phasic", and TN2 is a high sensitive neuron with a broader band-pass, best frequency of 13 kHz and the lowest threshold of 31 dB SPL. The effects of GABA, an inhibitory transmitter, and its antagonist picrotoxin on impulse discharges of TN2 were also studied Results show that GABA can inhibit impulse discharge of TN2. while picrotoxin increases spike discharges of the TN2. and even changes its discharge pattern from "phasic" to "tonic".