【摘要】 用不同声强的稳态WN和Click同时分别刺激猫的两耳,观察记录负荷WN侧耳蜗破坏前后的ABR,探讨对侧耳负荷的WN对ABR的影响规律及其可能的机制。结果表明,耳蜗破坏前,负荷40dB和75dB WN时,对0dB,45dB,70dB及75dB Click记录的ABR各波振幅均有明显影响（P<0.05～0.01）。耳蜗破坏后,同样条件下记录的ABR振幅基本无明显变化（P>0.05）。提示耳蜗破坏前的ABR振幅变小可能是由于两种声信号在脑干听觉通路上传时产生了抑制性BI,即WN信号对Click信号有一定干涉作用。70dBClick（75dB WN）时P₁波振幅减小与中枢的离中控制相关。更多还原

【Abstract】 I Both ears of cats were stimulated simultaneously and respectively by different intensityof static white noise (SWN) and click. At the same time we observed and recorded the ABRs before and after the damage of cochlea ipsilateral with the ear stimulated by SWN, and studied the effect of con-tralateral ear SWN on ABRs and its possible mechanism. We discovered that SWN of 40dB and 75dB affected the ABRS evoked by clicks of OdB, 45dB, 70dB and 75dB obviously before the cochlea of SWN ear was damaged (P < 0. 05). However, after the cochlea was destroyed, the amplitude of ABRs e-voked by clicks under the same conditions mentioned above had no obvious variations (P > 0. 05). The results suggested that the decrease of ABR amplitude before the damage of cochlea may be the result of inhibiting interaction between two kinds of signals ascending along brainstem auditory pathways, that is, SWN has an interference effect on click signal to a certain degree, and that the decrease of Pi amplitude evoked by 70dB click is related to the centrifugal control of central nervous system.更多还原