Zhang Fawen, Boettcher Flint A, Sun Xiao-Ming
Department of Otolaryngology, Head and Neck Surgery, University of Iowa, Iowa, USA.
Int J Audiol. 2007 Apr;46(4):187-95. doi: 10.1080/14992020601164162.
The amplitude of the 2f1-f2 distortion product otoacoustic emission (DPOAE) can be suppressed by presenting contralateral acoustic stimulation. To test the hypothesis that DPOAE contralateral suppression is influenced by the primary frequency in DPgrams, DPgrams were recorded at resolutions of 1, 8, and 17 pts/octave, in the absence and presence of contralateral broadband noise (BBN). Participants were 20 normal-hearing human adults. In DPgrams with higher frequency resolutions, DPOAE suppression at amplitude peaks in DPgrams (8 pts/octave: Mean = - 0.92 dB, SD = 0.71 for BBN at 60 dB SPL; 17 pts/octave: Mean = - 0.25 to -1.44 dB, SD = 0.51 to 0.86 for BBN at 40 to 70 dB SPL, respectively) was larger than the suppression at the dips in DPgrams (8 pts/octave: Mean = - 0.13 dB, SD = 1.00; 17 pts/octave: Mean = - 0.03 to -0.73 dB, SD = 0.55 to 0.91). A larger intersubject variability in DPOAE contralateral suppression was observed at the dips. The results suggest that measuring DPOAE contralateral suppression at the primary frequencies corresponding to the peaks in DPgrams with higher frequency resolutions may improve the assessment of the efferent system function.
通过施加对侧听觉刺激，可以抑制2f1-f2畸变产物耳声发射（DPOAE）的幅度。为了检验DPOAE对侧抑制受DPgram中主频影响这一假设，在有无对侧宽带噪声（BBN）的情况下，以1、8和17点/倍频程的分辨率记录DPgram。参与者为20名听力正常的成年人。在具有更高频率分辨率的DPgram中，DPgram幅度峰值处的DPOAE抑制（8点/倍频程：60 dB SPL的BBN时，平均值=-0.92 dB，标准差=0.71；17点/倍频程：40至70 dB SPL的BBN时，平均值=-0.25至-1.44 dB，标准差=0.51至0.86）大于DPgram波谷处的抑制（8点/倍频程：平均值=-0.13 dB，标准差=1.00；17点/倍频程：平均值=-0.03至-0.73 dB，标准差=0.55至0.91）。在波谷处观察到DPOAE对侧抑制的受试者间变异性更大。结果表明，在具有更高频率分辨率的DPgram中，在与峰值对应的主频处测量DPOAE对侧抑制可能会改善对传出系统功能的评估。
