Ménard Mikaël, Gallégo Stéphane, Berger-Vachon Christian, Collet Lionel, Thai-Van Hung
Université de Lyon, Lyon F-69003, France.
Hear Res. 2008 Jan;235(1-2):105-13. doi: 10.1016/j.heares.2007.10.007. Epub 2007 Nov 13.
The present study investigates the relationship between auditory steady-state responses (ASSRs) and loudness growth function. ASSR amplitudes were compared to the perceived loudness level at frequencies of 500 and 2000Hz in 11 normal-hearing subjects. As a first step, loudness growth function was estimated for the two test frequencies. Then ASSR amplitude was recorded for each of the two frequencies at different stimulus intensities, each corresponding to a loudness level as given by the first part of the study. Normalized results show that the ASSR amplitude correlates well with the loudness function (R(2)=0.81). A stepwise multiple linear regression confirmed these results with loudness explaining almost all the ASSR amplitude (loudness R(2)=0.81, p<0.001, f=562 and for intensity f=1.1, p=0.29). The non-linearity of the ASSR amplitude for low loudness levels can be explained by both the active amplification in the cochlea and the noise in the recording. The results suggest that ASSRs can be used for "objective" loudness measurement.
本研究调查了听觉稳态反应（ASSR）与响度增长函数之间的关系。在11名听力正常的受试者中，比较了500赫兹和2000赫兹频率下ASSR的振幅与感知响度水平。第一步，估计两个测试频率的响度增长函数。然后，在不同的刺激强度下记录两个频率各自的ASSR振幅，每个强度都对应于研究第一部分给出的响度水平。归一化结果表明，ASSR振幅与响度函数具有良好的相关性（R(2)=0.81）。逐步多元线性回归证实了这些结果，响度几乎解释了所有的ASSR振幅（响度R(2)=0.81，p<0.001，f=562；强度f=1.1，p=0.29）。低响度水平下ASSR振幅的非线性可由耳蜗中的主动放大和记录中的噪声来解释。结果表明，ASSR可用于“客观”响度测量。
