Kössl M, Vater M
Hear Res. 1985;19(2):157-70. doi: 10.1016/0378-5955(85)90120-0.
In the echolocating bat, Pteronotus parnellii, otoacoustic responses at a frequency of 62 kHz are measurable in the external ear canal during continuous and after transient acoustic stimulation. These responses are interpreted to represent emissions from the cochlea. They can reach an amplitude as large as 70 dB SPL and occur in the frequency range most important for echolocation, namely on the average about 700 Hz above the constant frequency component of the orientation calls. A sharp maximum of the amplitude of cochlear microphonic potentials at about 62 kHz could be correlated with the emission frequency. In one bat an evoked otoacoustic response changed to a spontaneous otoacoustic emission. The frequency and amplitude of the evoked otoacoustic responses reversibly decreased after exposure for 1 min to continuous sounds of more than 85 dB SPL with frequencies of about 2.5-7.5 kHz above the emission frequency. Similar effects occurred during anaesthesia or cooling. A possible relation between the existence of otoacoustic emissions and morphological specializations of the cochlea is discussed.
在回声定位蝙蝠帕氏叶鼻蝠中，在持续和瞬态声刺激期间，外耳道中可测量到频率为62千赫的耳声发射反应。这些反应被解释为代表来自耳蜗的发射。它们的幅度可达70分贝声压级，且出现在回声定位最重要的频率范围内，即在定位叫声的恒定频率成分之上平均约700赫兹处。耳蜗微音器电位幅度在约62千赫处的一个尖锐峰值可能与发射频率相关。在一只蝙蝠中，诱发耳声发射反应转变为自发性耳声发射。在暴露于频率比发射频率高约2.5 - 7.5千赫、声压级超过85分贝的连续声音1分钟后，诱发耳声发射反应的频率和幅度可逆性降低。在麻醉或冷却期间也出现类似效应。文中讨论了耳声发射的存在与耳蜗形态学特化之间的可能关系。
