Rabinowitz W M, Widin G P
J Acoust Soc Am. 1984 Dec;76(6):1713-20. doi: 10.1121/1.391618.
Spontaneous oto-acoustic emissions (SOAEs) were detected in eight of 19 ears from 12 persons with normal hearing. On a subset of these individuals, additional characteristics of SOAEs were studied including the suppression of SOAE level caused by an external tone. For suppressor tones below and slightly above the frequency of an SOAE, suppression is quite abrupt (about 5 dB of SOAE level reduction per dB increase in suppressor level); however, as suppressor frequency increases above the SOAE, the rate of suppression decreases. A release from suppression was demonstrated by the interaction of an SOAE with two external tones. When a tone above the SOAE frequency causes suppression, a second tone above the suppressor frequency can cause the SOAE to increase nearly to its ambient level. This finding is interpreted as the second tone having suppressed some aspect of the intracochlear influence of the first tone. The growth rate of this secondary suppression appears to be near 1 dB/dB, a value similar to rates derived from existing measures of two-tone suppression observed in auditory-nerve-fiber recordings in laboratory mammals.
在12名听力正常者的19只耳朵中，有8只检测到了自发性耳声发射（SOAE）。在这些个体的一个子集中，对SOAE的其他特征进行了研究，包括外部音调对SOAE水平的抑制。对于低于和略高于SOAE频率的抑制音，抑制相当突然（抑制音水平每增加1 dB，SOAE水平降低约5 dB）；然而，随着抑制音频率高于SOAE频率增加，抑制率会降低。SOAE与两个外部音调的相互作用证明了抑制解除。当高于SOAE频率的音调引起抑制时，高于抑制音频率的第二个音调可使SOAE几乎增加到其周围水平。这一发现被解释为第二个音调抑制了第一个音调在耳蜗内影响的某些方面。这种二次抑制的增长率似乎接近1 dB/dB，这一数值与从实验室哺乳动物听神经纤维记录中观察到的现有双音抑制测量得出的速率相似。
