Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton SO16 7PX, UK.
Hear Res. 2010 Oct 1;269(1-2):112-21. doi: 10.1016/j.heares.2010.06.020. Epub 2010 Jun 30.
Spontaneous otoacoustic emissions (SOAEs) and synchronized spontaneous otoacoustic emissions (SSOAEs) were recorded using both the standard closed-canal method of recording and a novel open-canal method which involved suspending the probe at the entrance to the ear canal with no occluding tip. In both conditions, a probe tube microphone was inserted down the ear canal to measure the acoustic pressure near the tympanic membrane. Open- and closed-canal recordings were obtained in twelve otologically normal ears, all of which exhibited SSOAEs, and 6 of which exhibited SOAEs. The results were analysed to identify any differences in response to frequency and amplitude. The different recording conditions appeared to have no significant effect on SOAE or SSOAE frequency, suggesting little effect on the SOAE generator within the cochlea. Below about 2 kHz, the amplitude for both types of emission was less for the open-canal recording when compared to the closed-canal recordings. Above 2 kHz, SSOAE amplitudes were greater in the open- than the closed-canal condition. Model stimulations of the ear canal and middle-ear acoustics are presented which were in qualitative agreement with the results shown for the effects on emission amplitudes.
自发耳声发射（SOAEs）和同步自发耳声发射（SSOAEs）是使用标准的封闭耳道记录方法和一种新的开放耳道记录方法记录的，该方法涉及将探头悬挂在耳道入口处，没有闭塞尖端。在这两种情况下，探针管麦克风都插入耳道，以测量鼓膜附近的声压。在 12 个听力正常的耳朵中获得了开放和封闭耳道的记录，所有这些耳朵都显示出 SSOAEs，其中 6 个显示出 SOAEs。对结果进行了分析，以确定对频率和幅度的响应是否存在差异。不同的记录条件似乎对 SOAE 或 SSOAE 的频率没有显著影响，这表明对耳蜗内的 SOAE 发生器影响很小。在大约 2 kHz 以下，与封闭耳道记录相比，开放耳道记录的两种类型的发射的幅度都较小。在 2 kHz 以上，SSSOAE 的幅度在开放耳道条件下大于封闭耳道条件下。还呈现了对耳道和中耳声学的模型刺激，这些刺激与对发射幅度的影响的结果定性一致。
