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首页> 外文期刊>Journal of the Association for Research in Otolaryngology: JARO >Effect of Contralateral Medial Olivocochlear Feedback on Perceptual Estimates of Cochlear Gain and Compression
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Effect of Contralateral Medial Olivocochlear Feedback on Perceptual Estimates of Cochlear Gain and Compression

机译：对侧内侧耳蜗反馈对耳蜗增益和压迫感估计的影响

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摘要

The active cochlear mechanism amplifies responses to low-intensity sounds, compresses the range of input sound intensities to a smaller output range, and increases cochlear frequency selectivity. The gain of the active mechanism can be modulated by the medial olivocochlear (MOC) efferent system, creating the possibility of top-down control at the earliest level of auditory processing. In humans, MOC function has mostly been measured by the suppression of otoacoustic emissions (OAEs), typically as a result of MOC activation by a contralateral elicitor sound. The exact relationship between OAE suppression and cochlear gain reduction, however, remains unclear. Here, we measured the effect of a contralateral MOC elicitor on perceptual estimates of cochlear gain and compression, obtained using the established temporal masking curve (TMC) method. The measurements were taken at a signal frequency of 2 kHz and compared with measurements of click-evoked OAE suppression. The elicitor was a broadband noise, set to a sound pressure level of 54 dB to avoid triggering the middle ear muscle reflex. Despite its low level, the elicitor had a significant effect on the TMCs, consistent with a reduction in cochlear gain. The amount of gain reduction was estimated as 4.4 dB on average, corresponding to around 18 % of the without-elicitor gain. As a result, the compression exponent increased from 0.18 to 0.27.
机译：主动耳蜗机制可放大对低强度声音的响应，将输入声音强度的范围压缩到较小的输出范围，并提高耳蜗频率的选择性。主动机制的增益可通过内侧少毛（MOC）传出系统进行调节，从而在听觉处理的最早水平上实现了自上而下控制的可能性。在人类中，MOC功能主要是通过抑制耳声发射（OAE）来测量的，通常是由于对侧激发声对MOC的激活。但是，尚不清楚OAE抑制与耳蜗增益降低之间的确切关系。在这里，我们测量了对侧MOC激发子对使用建立的时间掩蔽曲线（TMC）方法获得的耳蜗增益和压缩的感知估计的影响。在2 kHz的信号频率下进行测量，并将其与单击诱发的OAE抑制测量进行比较。引发剂是宽带噪声，其声压级设置为54 dB，以避免触发中耳肌肉反射。尽管其水平较低，但激发子对TMC具有显着的影响，与耳蜗增益的降低相一致。增益降低的量平均估计为4.4 dB，大约相当于无激励器增益的18％。结果，压缩指数从0.18增加到0.27。

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