Starkey Hearing Research Center, 2150 Shattuck Avenue, Suite 408, Berkeley, California 94704-1345, USA.
J Acoust Soc Am. 2011 Feb;129(2):864-75. doi: 10.1121/1.3523340.
Slopes of forward-masked psychometric functions (FM PFs) were compared with distortion-product otoacoustic emission (DPOAE) input/output (I/O) parameters at 1 and 6 kHz to test the hypothesis that these measures provide similar estimates of cochlear compression. Implicit in this hypothesis is the assumption that both DPOAE I/O and FM PF slopes are functionally related to basilar-membrane (BM) response growth. FM PF-slope decreased with signal level, but this effect was reduced or reversed with increasing hearing loss; there was a trend of decreasing psychometric function (PF) slope with increasing frequency, consistent with greater compression at higher frequencies. DPOAE I/O functions at 6 kHz exhibited an increase in the breakpoint of a two-segment slope as a function of hearing loss with a concomitant decrease in the level of the distortion product (L(d)). Results of the comparison between FM PF and DPOAE I/O parameters revealed only a weak correlation, suggesting that one or both of these measures may provide unreliable information about BM compression.
将正向掩蔽心理物理函数（FM PF）的斜率与 1 和 6 kHz 下的畸变产物耳声发射（DPOAE）的输入/输出（I/O）参数进行比较，以检验这些测量值是否提供相似的耳蜗压缩估计值。该假设隐含的一个假设是，DPOAE I/O 和 FM PF 斜率都与基底膜（BM）反应增长有功能上的关系。FM PF 斜率随信号水平下降，但这种效应在听力损失增加时减少或逆转；随着频率的增加，心理物理函数（PF）斜率呈下降趋势，这与更高频率下更大的压缩一致。6 kHz 处的 DPOAE I/O 函数随着听力损失的增加，在两段斜率的拐点处呈上升趋势，而畸变产物的水平（L(d)）则呈下降趋势。FM PF 和 DPOAE I/O 参数之间的比较结果仅显示出微弱的相关性，这表明这些测量值中的一个或两个可能提供关于 BM 压缩的不可靠信息。
