Influence of primary frequencies ratio on distortion product otoacoustic emissions amplitude. II. Interrelations between multicomponent DPOAEs, tone-burst-evoked OAEs, and spontaneous OAEs
Influence of primary frequencies ratio on distortion product otoacoustic emissions amplitude. II. Interrelations between multicomponent DPOAEs, tone-burst-evoked OAEs, and spontaneous OAEs
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DOI：
10.1121/1.428434
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发表时间：
2000-03-01
影响因子：
2.4
通讯作者：
Moulin, A
中科院分区：
文献类型：
--
作者：
Moulin, A
畸变产物耳声发射（DPOAEs）被广泛用于人类耳蜗功能的评估。众所周知，2f 1-f2 DPOAE振幅随着f2/f1比从1.0增加到约1.20而增加，然后随着f2/f1比增加到1.20以上而减小，显示出振幅比函数，这被认为与耳蜗滤波特性有关。不同的下边带DPOAE被认为表现出与2f 1-f2 DPOAE相同的振幅比函数，其幅度峰值位于相对于f2的恒定DPOAE频率处。最近，一些研究表明，参与的DPOAE分量来自自己的失真产品的地方，以及DPOAE分量来自f2的地方。为探讨DPOAE的产生部位及频率位置的重要性，本文采用固定f_2、f_1、f_2两种方法，在10个不同的f_2频率下，对18名正常人的DPOAE 2f_1-f_2、3f_1 - 2f_2、4f_1 - 3f_2和2f_2-f_1、3f_2 - 2f_1、4f_2 - 3f_1分量的振幅比函数进行了系统研究。结果表明，失真幅度峰值的f2频率的依赖性为每个下边带的DPOAE，和一个小的频率偏移的失真峰值的高阶下边带DPOAE分量。无论是用相同的f1和不同的f2）记录还是用相同的f2和不同的f1）记录，都得到了不同下边带DPOAE幅度之间的强相关性，这表明下边带DPOAE幅度不依赖于f2频率的微小变化。此外，DPOAE振幅和短纯音诱发耳声发射（TBOAE）之间的相关性是非常显着的TBOAE集中在f2频率和1/2倍频程低于f2频率，这表明一定程度的重要性，耳蜗状态在频率低于f2的DPOAE振幅。受试者呈现自发性耳声发射表现出更大的下边带DPOAE振幅记录为低f2/f1比，和失真幅度峰值移向更高的频率。上边带DPOAE振幅和下边带DPOAE振幅之间的最佳相关性发生在下边带DPOAE中，该下边带DPOAE是由低于用于产生上边带DPOAE的基色的1/2倍频程至1倍频程的f2频率产生的，这表明上边带DPOAE的产生位置在f2的基础上。TBOAE幅值与上边带DPOAE幅值之间的相关性与上边带DPOAE产生的位置一致，该位置以f2为基准，并随DPOAE频率本身的移动而移动。(C)2000年美国声学学会。【S0001-4966（00）03202-1】。
Distortion product otoacoustic emissions (DPOAEs) are used widely in humans to assess cochlear function. It is well known that 2f1-f2 DPOAE amplitude increases as the f2/f1 ratio increases from 1.0 to about 1.20, and then decreases as the f2/f1 ratio increases above 1.20, showing an amplitude ratio function, which is thought to be related to cochlear filtering properties. Different lower sideband DPOAEs are believed to show the same amplitude ratio functions as the 2f1-f2 DPOAE, with a magnitude peak situated at a constant DPOAE frequency relative to f2. More recently, several studies have suggested the involvement of a DPOAE component coming from its own distortion product place as well as the DPOAE component coming from the f2 place. To investigate DPOAE generation sites and the importance of the DPOAE frequency place, amplitude ratio functions of 2f1-f2, 3f1-2f2, 4f1-3f2 and 2f2-f1, 3f2-2f1, 4f2-3f1 DPOAE components have been systematically studied in 18 normally hearing subjects, using an f2 fixed, f1 sweep method, and an f1 fixed, f2 sweep method, at ten different f2 frequencies. Results show a dependency of the distortion magnitude peak on f2 frequency for each lower sideband DPOAE, and a small frequency shift of the distortion peak for the high order lower sideband DPOAE components. Strong correlation between the different lower sideband DPOAE amplitude were obtained, whether they were recorded with the same f1 land a different f2) or with the same f2 land a different f1), suggesting that lower side-band DPOAE amplitude does not depend on small variations in the f2 frequency. Moreover, correlations between DPOAE amplitude and tone-burst evoked otoacoustic emissions (TBOAEs) are highly significant for TBOAEs centered at the f2 frequency and at 1/2 octave below the f2 frequency, suggesting some degree of importance of the cochlear status at frequencies below f2 in DPOAE amplitude. Subjects presenting spontaneous otoacoustic emissions showed a greater lower sideband DPOAE amplitude recorded for low f2/f1 ratios, and a distortion magnitude peak shifted towards higher frequencies. The best correlation between upper sideband DPOAE amplitude and lower sideband DPOAE amplitude occurred for lower sideband DPOAEs generated by an f2 frequency 1/2 octave to 1 octave below the primaries used to generate upper sideband DPOAEs, suggesting a site of generation basal to f2 for the upper sideband DPOAEs. Correlations between TBOAE amplitude and upper sideband DPOAE amplitude agreed with a site of upper sideband DPOAE generation basal to f2, and which would move with the DPOAE frequency itself. (C) 2000 Acoustical Society of America. [S0001-4966(00)03202-1].