Gorga Michael P, Neely Stephen T, Dorn Patricia A, Hoover Brenda M
Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
J Acoust Soc Am. 2003 Jun;113(6):3275-84. doi: 10.1121/1.1570433.
Recently, Boege and Janssen [J. Acoust. Soc. Am. 111, 1810-1818 (2002)] fit linear equations to distortion product otoacoustic emission (DPOAE) input/output (UO) functions after the DPOAE level (in dB SPL) was converted into pressure (in microPa). Significant correlations were observed between these DPOAE thresholds and audiometric thresholds. The present study extends their work by (1) evaluating the effect of frequency, (2) determining the behavioral thresholds in those conditions that did not meet inclusion criteria, and (3) including a wider range of stimulus levels. DPOAE I/O functions were measured in as many as 278 ears of subjects with normal and impaired hearing. Nine f2 frequencies (500 to 8000 Hz in 1/2-octave steps) were used, L2 ranged from 10 to 85 dB SPL (5-dB steps), and L1 was set according to the equation L1 = 0.4L2 + 39 dB [Kummer et al., J. Acoust. Soc. Am. 103, 3431-3444 (1998)] for L2 levels up to 65 dB SPL, beyond which L1 = L2. For the same conditions as those used by Boege and Janssen, we observed a frequency effect such that correlations were higher for mid-frequency threshold comparisons. In addition, a larger proportion of conditions not meeting inclusion criteria at mid and high frequencies had hearing losses exceeding 30 dB HL, compared to lower frequencies. These results suggest that DPOAE I/O functions can be used to predict audiometric thresholds with greater accuracy at mid and high frequencies, but only when certain inclusion criteria are met. When the SNR inclusion criterion is not met, the expected amount of hearing loss increases. Increasing the range of input levels from 20-65 dB SPL to 10-85 dB SPL increased the number of functions meeting inclusion criteria and increased the overall correlation between DPOAE and behavioral thresholds.
最近，伯格和扬森[《美国声学学会杂志》111, 1810 - 1818 (2002)]在将畸变产物耳声发射（DPOAE）水平（以dB SPL为单位）转换为压力（以微帕为单位）后，对畸变产物耳声发射（DPOAE）输入/输出（I/O）函数拟合线性方程。在这些DPOAE阈值与听力计阈值之间观察到显著相关性。本研究扩展了他们的工作，具体包括：（1）评估频率的影响；（2）确定那些不符合纳入标准的情况下的行为阈值；（3）纳入更广泛的刺激水平范围。在多达278名听力正常和受损受试者的耳朵中测量了DPOAE I/O函数。使用了九个f2频率（以1/2倍频程步长从500到8000 Hz），L2范围为10到85 dB SPL（以5 dB步长），并且对于L2水平高达65 dB SPL，L1根据方程L1 = 0.4L2 + 39 dB[库默等人，《美国声学学会杂志》103, 3431 - 3444 (1998)]设置，超过该水平L1 = L2。对于与伯格和扬森所使用的相同条件，我们观察到一种频率效应，即中频阈值比较的相关性更高。此外，与低频相比，在中高频不符合纳入标准的情况中，有更大比例的听力损失超过30 dB HL。这些结果表明，DPOAE I/O函数可用于在中高频更准确地预测听力计阈值，但前提是要满足某些纳入标准。当信噪比纳入标准未满足时，预期的听力损失量会增加。将输入水平范围从20 - 65 dB SPL增加到10 - 85 dB SPL会增加符合纳入标准的函数数量，并增加DPOAE与行为阈值之间的总体相关性。
