TEOAE EVOKED BY COMPLEX TONE BURST SIMULATING VOWEL AND MONOSYLLABLE JAPANESE WORD COMPONENT AND RERATIONSHIP BETWEEN AGING OF COCHLEA.

耳声发射可用于评估个体耳蜗功能的状态。特别是在瞬态诱发耳声发射（TEOAE）中，平均波形和功率谱在频域和时域上提供了耳蜗对刺激反应的各种信息，也提供了个体间反应的差异。由于认为有必要对作为交流器官的耳蜗对语音的功能进行一些客观的测量，因此本研究探讨了用TEOAE测量来评估耳蜗对语音的责任的可能性。以日语元音和单音节词成分为模型，研究了复杂刺激诱发的teoae。利用ILO88的突发音生成函数作为元音模型，生成5种突发音刺激。在日本年轻女性中评估的已发表的元音共振峰的平均频率被引入到第二代的音调中。在此基础上，利用“click”和元音的“tone burst”模型作为单音节日语词成分的模型，采用相同的方法创建了复杂的“tone burst”。用ILO88耳动力分析仪记录teoae，分别从刺激间差异和个体间差异两方面研究teoae的波形和功率谱。结果表明，元音模型诱发的TEOAE波形存在刺激间差异和个体间差异。TEOAE的功率谱与各刺激分量相对应。TEOAE的复测稳定性在1年内得到证实。日语单音节词分量模型诱发的TEOAE波形也存在刺激间和个体间差异，波形的早期和晚期分别主要受咔嚓声分量和元音分量的影响。从这些结果可以看出，TEOAE波形的长期稳定性、刺激间性和个体间差异性得到了证实，复杂刺激的特征在TEOAE波形和功率谱上得到了体现。然而，在听力正常的被试中，单音节感知的功能无法客观评价。少

Otoacoustic emissions are useful to estimate the status of individual cochlear function. Especially in transiently evoked otoacoustic emission (TEOAE), the averaged waveform and the power spectrum provide the different kinds of information concerning the cochlear response to the stimulus in frequency and time domain, and also provide the inter-individual difference in response. The possibility of the TEOAE measurement to assess the responsibility of the cochlear to speech sound was investigated in the present study, since some objective measurement for the function of cochlear, the organ for communication, to speech sound was thought to be necessary.We investigated TEOAEs evoked by complex stimuli as a model of vowel and monosyllable Japanese word component. Five kinds of tone burst stimuli were generated using tone burst generation function of ILO88 as the model of vowel. The published mean frequencies of the vowel formants evaluated in Japanese young women were introduced into tone b … More urst generation. Furthermore, also the complex tone bursts were created in the same way using click and the tone burst models of vowel as the model of the monosyllable Japanese word component. TEOAEs were recorded with ILO88 Otodynamic Analyzer and the wave form and the power spectrum were investigated in terms of inter-stimulus and inter-individual difference respectively.In the results, the waveforms of TEOAE evoked by the vowel models indicated inter-stimulus and inter-individual differences. The power spectrum of TEOAE corresponded to the components of each stimulus. The test-retest stability of TEOAE was confirmed within one-year period. The waveform of TEOAE evoked by the model of the Japanese monosyllable word components also indicated inter-stimulus and inter-individual difference and the early and the late component of the waveform were mainly affected by the click and the vowel component respectively.From these results, we concluded that the long-term stability, the inter-stimulus and the inter-individual difference of the TEOAE waveform were confirmed and the characteristics of complex stimuli were reflected in the wave form and the power spectrum of TEOAE. The function of monosyllable perception, however, could not be estimated in the present method objectively in hearing normal subjects. Less