Near equivalence of human click-evoked and stimulus-frequency otoacoustic emissions
Near equivalence of human click-evoked and stimulus-frequency otoacoustic emissions
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DOI：
10.1121/1.2435981
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发表时间：
2007-04-01
影响因子：
2.4
通讯作者：
Shera, Christopher A.
中科院分区：
文献类型：
--
作者：
Kalluri, Radha;Shera, Christopher A.
由宽带短声和单音诱发的耳声发射（OAEs）被广泛认为是通过耳蜗内的不同机制产生的。尽管由音调诱发的刺激频率OAE（SFOAE）的性质与经由线性机制的起源一致，所述线性机制涉及由力学中预先存在的扰动引起的相干波散射，但是由宽带喀喇声诱发的OAE（CEOAE）已经被建议经由刺激的不同频率分量之间的非线性相互作用（例如，互调失真）。这里报告的实验测试OAE生成机制的带宽依赖性差异。点击诱发和刺激频率OAE输入/输出传递函数，并作为刺激频率和强度的函数进行比较。在低强度和中等强度下，人CEOAE和SFOAE传递函数几乎相同。当刺激强度在“带宽补偿”声压级（cSPL）下测量时，CEOAE和SFOAE传递函数在固定频率下具有等效的增长函数，在固定强度下具有等效的频谱特性。这种等效性表明CEOAE和SFOAE是由相同的机制产生的。虽然CEOAE和SFOAE因诱发它们的刺激不同而有不同的名称，但这两种OAE“类型”显然最好理解为同一发射家族的成员。(c)2007年，美国声学学会。
Otoacoustic emissions (OAEs) evoked by broadband clicks and by single tones are widely regarded as originating via different mechanisms within the cochlea. Whereas the properties of stimulus-frequency OAEs (SFOAEs) evoked by tones are consistent with an origin via linear mechanisms involving coherent wave scattering by preexisting perturbations in the mechanics, OAEs evoked by broadband clicks (CEOAEs) have been suggested to originate via nonlinear interactions among the different frequency components of the stimulus (e.g., intermodulation distortion). The experiments reported here test for bandwidth-dependent differences in mechanisms of OAE generation. Click-evoked and stimulus-frequency OAE input/output transfer functions were obtained and compared as a function of stimulus frequency and intensity. At low and moderate intensities human CEOAE and SFOAE transfer functions are nearly identical. When stimulus intensity is measured in "bandwidth-compensated" sound-pressure level (cSPL), CEOAE and SFOAE transfer functions have equivalent growth functions at fixed frequency and equivalent spectral characteristics at fixed intensity. This equivalence suggests that CEOAEs and SFOAEs are generated by the same mechanism. Although CEOAEs and SFOAEs are known by different names because of the different stimuli used to evoke them, the two OAE "types" are evidently best understood as members of the same emission family. (c) 2007 Acoustical Society of America.