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经典理论认为耳蜗微音器电位（ＣＭ）无潜伏期，但最近在临床研究中发现ＣＭ反应起始点随测试声的频率和强度的变化而发生移位。本文以动物为对象进行了初步探讨。结果表明：正常豚鼠耳上无论用面神经管引导电极，还是耳蜗鼓阶骨壁或鼓阶内引导电极均可发现ＣＭ反应波有明显的起始点移位现象，而用麦克风直接记录声波波形则没有此现象。一定强度的白噪声暴露后，ＣＭ反应起始点无明显变化，而听神经动作电位潜伏期则显著延长。ＣＭ反应起始点移位的主要原因可能是行波在基底膜上的传播时间。
Classical theory that the cochlear microphones potential (CM) no latency, but recently found in clinical studies CM response starting point with the test sound frequency and intensity of the shift occurred. In this paper, animal as the object for a preliminary study. The results show that the normal starting point shift of CM response wave can be found in the normal guinea pig’s ear whether using the facial nerve conduction electrode or the cochlear bone wall or the guiding electrode in the scala tympani. However, This phenomenon. After a certain intensity of white noise exposure, there was no obvious change in the starting point of CM reaction, while the latency of auditory nerve action potential was significantly prolonged. The main reason for the shift of the CM reaction initiation point may be the traveling time of the traveling wave on the basement membrane.