Human cochlear tuning estimates from stimulus-frequency otoacoustic emissions
Human cochlear tuning estimates from stimulus-frequency otoacoustic emissions
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DOI：
10.1121/1.3575596
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发表时间：
2011-06-01
影响因子：
2.4
通讯作者：
Dau, Torsten
中科院分区：
文献类型：
--
作者：
Bentsen, Thomas;Harte, James M.;Dau, Torsten
提出了两种客观测量人类耳蜗调谐的方法，即使用刺激频率耳声发射（SFOAE）。一种测量使用SFOAE相位梯度延迟和另一种双音抑制（2TS）调谐曲线。在这里，假设这两种测量方法在同一听者中导致不同的频率函数。两项实验分别在10名年轻成年正常听力听者的3个频段（1-2 kHz、3-4 kHz和5-6 kHz）进行。实验1记录SFOAE潜伏期随刺激频率的变化，实验2记录2TS等输入调谐曲线。在这两种情况下，输出都被转换成基于等效矩形带宽的锐度调谐因子。在这两个实验中，调谐曲线的锐度与频率有关，随着频率的增加，相对调谐的锐度也随之增加。在实验2中，仅观察到调谐曲线的锐度的微弱频率依赖性，与文献中的客观和行为估计一致。最重要的是，两个调优估计之间的绝对差异非常大，并且在统计上非常显著。有人认为，耳蜗调谐的2TS估计可能代表了抑制机制的潜在特性，而不一定是耳蜗调谐。因此，相位梯度延迟估计是最可能反映耳蜗调谐的估计。(C) 2011美国声学学会。(DOI: 10.1121/1.3575596)
Two objective measures of human cochlear tuning, using stimulus-frequency otoacoustic emissions (SFOAE), have been proposed. One measure used SFOAE phase-gradient delay and the other two-tone suppression (2TS) tuning curves. Here, it is hypothesized that the two measures lead to different frequency functions in the same listener. Two experiments were conducted in ten young adult normal-hearing listeners in three frequency bands (1-2 kHz, 3-4 kHz and 5-6 kHz). Experiment 1 recorded SFOAE latency as a function of stimulus frequency, and experiment 2 recorded 2TS iso-input tuning curves. In both cases, the output was converted into a sharpness-of-tuning factor based on the equivalent rectangular bandwidth. In both experiments, sharpness-of-tuning curves were shown to be frequency dependent, yielding sharper relative tuning with increasing frequency. Only a weak frequency dependence of the sharpness-of-tuning curves was observed for experiment 2, consistent with objective and behavioural estimates from the literature. Most importantly, the absolute difference between the two tuning estimates was very large and statistically significant. It is argued that the 2TS estimates of cochlear tuning likely represents the underlying properties of the suppression mechanism, and not necessarily cochlear tuning. Thus the phase-gradient delay estimate is the most likely one to reflect cochlear tuning. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3575596]