Wable J, Collet L
Laboratoire de Physiologie Sensorielle, CNRS URA 1447, Université Claude Bernard, Hôpital Edouard Herriot, Lyon, France.
Hear Res. 1994 Nov;80(2):141-5. doi: 10.1016/0378-5955(94)90105-8.
In this study, spontaneous and transiently evoked otoacoustic emissions (SOAEs and TOAEs, respectively) were recorded in 15 normal-hearing subjects. An analysis of the TOAE spectrum was performed with three time intervals: 20 ms-40 ms, 40 ms-60 ms, 60 ms-80 ms (the spectra found are labelled TOAE2-4, TOAE4-6, TOAE6-8). The frequencies of the peaks observed were compared to the SOAE frequencies. We found that 78.8% of the TOAE peaks also were observed as SOAEs and 91.2% of the SOAE peaks were recorded in the TOAE2-4 spectrum. Peaks that were not observed by either method had lower amplitude than the others, and SOAE peaks that were not in TOAE2-4 spectrum had higher frequencies than those that were observed in the TOAE2-4 spectrum. We conclude that the TOAE spectrum recorded after 20 ms does not include all of the SOAE frequencies and is not composed solely of SOAEs. Therefore, frequencies exist which are synchronized specifically to the stimulus and SOAEs exist which can't be synchronized more than 20 ms.
在本研究中，对15名听力正常的受试者记录了自发性耳声发射和瞬态诱发耳声发射（分别为SOAE和TOAE）。对TOAE频谱进行了三个时间间隔的分析：20毫秒至40毫秒、40毫秒至60毫秒、60毫秒至80毫秒（所发现的频谱标记为TOAE2 - 4、TOAE4 - 6、TOAE6 - 8）。将观察到的峰值频率与SOAE频率进行比较。我们发现，78.8%的TOAE峰值也被观察为SOAE，91.2%的SOAE峰值记录在TOAE2 - 4频谱中。两种方法均未观察到的峰值幅度低于其他峰值，且不在TOAE2 - 4频谱中的SOAE峰值频率高于在TOAE2 - 4频谱中观察到的频率。我们得出结论，20毫秒后记录的TOAE频谱并未包含所有SOAE频率，且并非仅由SOAE组成。因此，存在特定于刺激同步的频率，也存在超过20毫秒无法同步的SOAE。
