Distortion Product Otoacoustic Emission Component Behavior as a Function of Primary Frequency Ratio and Primary Level.
Distortion Product Otoacoustic Emission Component Behavior as a Function of Primary Frequency Ratio and Primary Level.
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DOI：
10.1097/aud.0000000000001251
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发表时间：
2022-11-01
期刊：
影响因子：
3.7
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中科院分区：
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畸变产物耳声发射（DPOAEs）由畸变和反射两部分组成。关于刺激频率比（f2/f1）对整体/复合DPOAE水平的影响，我们已经知道得很多。然而，f2/f1对单个DPOAE分量的影响没有得到很好的研究。本初步研究的目的是系统地评价f2/f1对临床听力正常的年轻成人耳DPOAE成分的影响。为了扩展文献中的有限报告，使用两种刺激水平组合在扩展的频率范围内进行了这项检查。DPOAE记录从7个正常听力，年轻的成年人的耳朵之间的f2频率为0.75和16 kHz的范围内的f2/f1使用两个刺激水平的组合。使用逆FFT算法分离失真（DPOAED）和反射（DPOAER）分量。复合DPOAE和DPOAE组件的最佳比例，确定从平滑版本的水平与比例函数在每种情况下。复合DPOAE水平的最佳比率随刺激水平的增加而增加，并随频率的增加而降低。DPOAE成分的最佳比例遵循类似的趋势，随着频率的增加而降低。DPOAED的最佳比例一般高于DPOAER。DPOAED的总体水平大于DPOAER，两者均随频率增加而降低。DPOAER，但不是DPOAED，在较高频率下的噪声基底以上变得不可记录。DPOAE分量作为f2/f1的函数表现相似但不完全相同。耳道DPOAE通常以DPOAED为主。作为f2/f1的函数的DPOAED的行为与耳蜗力学的已知性质完全一致。DPOAER的行为在耳朵之间变化更大，这可能反映了影响其最终形式的参数数量的增加。试图使用允许耳道DPOAE朝向一个分量或另一个分量的更大偏置的f2/f1似乎是不实际的。
Distortion product otoacoustic emissions (DPOAEs) are composed of distortion and reflection components. Much is known about the influence of the stimulus frequency ratio (f2/f1) on the overall/composite DPOAE level. However, the influence of f2/f1 on individual DPOAE components is not as well examined. The goals of this pilot study were to systematically evaluate the effects of f2/f1 on DPOAE components in clinically normal-hearing young adult ears. To extend the limited reports in the literature, this examination was carried out over an extended frequency range using two stimulus level combinations. DPOAE were recorded from seven normal-hearing, young adult ears for f2 frequencies between 0.75 and 16 kHz over a range of f2/f1 using two stimulus level combinations. The distortion (DPOAED) and reflection (DPOAER) components were separated using an inverse FFT algorithm. Optimal ratios for the composite DPOAE and DPOAE components were determined from smoothed versions of level versus ratio functions in each case. The optimal ratio for the composite DPOAE level increased with stimulus level and decreased as a function of frequency above 1 kHz. The optimal ratios for the DPOAE components followed a similar trend, decreasing with increasing frequency. The optimal ratio for DPOAED was generally higher than that for DPOAER. The overall level for DPOAED was greater than that of DPOAER, both decreasing with increasing frequency. DPOAER, but not DPOAED, became unrecordable above the noise floor at the higher frequencies. DPOAE components behave similarly but not identically as a function of f2/f1. The ear canal DPOAE is generally dominated by DPOAED. The behavior of DPOAED as a function of f2/f1 is entirely consistent with known properties of cochlear mechanics. The behavior of DPOAER is more variable across ears, perhaps reflective of the increased number of parameters that influence its final form. Attempting to use an f2/f1 that would allow a greater bias of the ear canal DPOAE towards one component or the other does not appear to be practical.