Rajan R, Robertson D, Johnstone B M
Department of Physiology, University of Western Australia, Perth, Australia.
Hear Res. 1990 Mar;44(2-3):195-207. doi: 10.1016/0378-5955(90)90080-9.
In Nembutal- or Urethane-anaesthetised guinea pigs N1 audiograms and N1 input-output functions were measured as were compound action potential (CAP) tuning curves under forward masking and simultaneous masking conditions. Then the crossed olivocochlear bundle was lesioned at the floor of the fourth ventricle and the cochlear responses were re-measured. There were never any changes in the N1 audiograms, input-output functions, or the CAP tuning curves. Thus, the crossed efferent pathways do not appear to play any tonic role in determining cochlear threshold sensitivities, selectivities or masking phenomena in anaesthetised guinea pigs with normal hearing sensitivities.
在戊巴比妥或氨基甲酸乙酯麻醉的豚鼠中，测量了N1听力图和N1输入-输出函数，以及在正向掩蔽和同时掩蔽条件下的复合动作电位（CAP）调谐曲线。然后，在第四脑室底部损伤交叉橄榄耳蜗束，并重新测量耳蜗反应。N1听力图、输入-输出函数或CAP调谐曲线从未有任何变化。因此，在听力敏感度正常的麻醉豚鼠中，交叉传出通路在决定耳蜗阈值敏感度、选择性或掩蔽现象方面似乎不发挥任何紧张性作用。
