Are Normal Hearing Thresholds a Sufficient Condition for Click-Evoked Otoacoustic Emissions?
Are Normal Hearing Thresholds a Sufficient Condition for Click-Evoked Otoacoustic Emissions?
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正常听力阈值是点击诱发耳声发射的充分条件吗？
DOI：
10.1260/0957456991496745
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发表时间：
1997
影响因子：
--
通讯作者：
M. Lutman
中科院分区：
文献类型：
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作者：
S. Kapadia;M. Lutman
在一些研究中，瞬态诱发耳声发射（TEOAE）在少数正常耳中不存在。其他研究报告了所有正常耳朵的teoae。研究之间的差异可能直接来自TEOAE鉴定标准，正常选择标准，或由于样本量有限而导致的统计差异。为了理解和模拟TEOAE产生所涉及的耳蜗过程，需要知道正常听力是否会自动导致TEOAE的产生。本研究的目的是在一个大样本中确定是否有耳朵在正常的听力阈值水平（HTL）下缺乏teoae。在实验室条件下，对来自高度合作的成人受试者的397只耳朵进行了检查。以重复非线性波形之间的相互关系作为判据，99.2%的样品中存在teoae（低CI为98.1%）。然而，对其余耳的记录波形进行仔细的目视评估并没有明确显示任何正常HTLs的耳朵都没有TEOAE特征。虽然TEOAE强度因耳朵而异，但没有明确的证据表明当HTLs正常时TEOAE可以消失。
Transient-evoked otoacoustic emissions (TEOAE) have been reported in several studies as absent in a small minority of normal ears. Other studies have reported TEOAEs in all normal ears. Differences between studies may arise directly from criteria for TEOAE identification, criteria for selection of normals, or statistically due to limited sample sizes. In order to understand and model cochlear processes involved in TEOAE generation, it needs to be known whether the presence of normal hearing leads automatically to generation of TEOAEs. The present study set out to establish in a large sample if any ears could be found that lacked TEOAEs despite normal hearing threshold levels (HTL). A total of 397 ears from highly co-operative adult subjects were examined, under laboratory conditions. Using cross-correlation between replicate nonlinear wave forms as the criterion, TEOAEs were present in of 99.2% of the sample (lower CI 98.1%). However, careful visual assessment of the recorded wave forms for the remaining ears did not unequivocally show absence of TEOAE characteristics in any ear with normal HTLs. Whilst TEOAE strength varies amongst ears, no clear evidence was found to show that TEOAEs can be absent when HTLs are normal.