Dependence of the DPOAE amplitude pattern on acoustical biasing of the cochlear partition
Dependence of the DPOAE amplitude pattern on acoustical biasing of the cochlear partition
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DOI：
10.1016/j.heares.2004.11.011
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发表时间：
2005-05-01
期刊：
影响因子：
2.8
通讯作者：
Russell, IJ
中科院分区：
文献类型：
--
作者：
Lukashkin, AN;Russell, IJ
实验记录了豚鼠在120 dB SPL下，在30 Hz低频偏置音的情况下，高频主音水平同时增加时的畸变产物耳声发射（dpoae）。作为偏置音调相角的函数绘制的DPOAE振幅显示出独特的可重复的最小值，这与在单个饱和非线性输出处观察到的失真产品的幅度缺口相同。振幅极小值的数目随着DPOAE阶数的增加而增加，该模型也再现了这一特征。由于单一饱和非线性而产生的DPOAE模型并不能解释实验观察到的DPOAE对偏置音调上升和下降半周期的响应的不对称性。这种不对称归因于一种假设的机制，该机制调整了外毛细胞机电换能器的工作点。实验数据与一个假设一致，即对于本研究中使用的刺激参数，上下边带dpoae都是由耳蜗中单个和空间局部位置产生的发射主导的。(c) 2004 Elsevier B.V.版权所有
Distortion product otoacoustic emissions (DPOAEs) were recorded from guinea pigs in response to simultaneous increases in the levels of high frequency primary tones in the presence of a low frequency biasing tone of 30 Hz at 120 dB SPL. The DPOAE amplitudes plotted as functions of the biasing tone phase angle show distinctive repeatable minima, which are identical to the amplitude notches observed for the distortion products at the output of a single saturating non-linearity. The number of the amplitude minima grows with increasing order of the DPOAE, a feature that is also reproduced by the model. The model of DPOAE generation due to a single saturating non-linearity does not explain the experimentally observed asymmetry of the response of the DPOAEs to rising and falling half cycles of the biasing tone. This asymmetry is attributed to a hypothetical mechanism, which adjusts the operating point of the outer hair cell's mechanoelectrical transducer. Experimental data were consistent with a hypothesis that, for the parameters of stimulation used in this study, both lower and upper sideband DPOAEs are dominated by emission generated from a single and spatially localized place in the cochlea. (c) 2004 Elsevier B.V. All rights reserved.