Brown A M, Kemp D T
Hear Res. 1984 Jan;13(1):29-37. doi: 10.1016/0378-5955(84)90092-3.
The suppression tuning properties of the oto-acoustic distortion product emission, 2f1-f2 have been measured in the ear canal of gerbil and man. The results show the acoustic response to be suppressible in a similar, frequency-dependent manner in both species. Frequencies near to those of the stimulating tones are most effective in suppressing the response. Derived iso-suppression tuning curves have Q10dB values of between 1 and 6. Suppressor tones having frequencies near to f2 (the higher frequency stimulus) make a contribution to the tuning curve which is largely independent of the stimulus intensity and the frequency ratio between the two primary tones. Suppressors having f1-associated frequencies produce a variable amount of suppression depending on the stimulus parameters chosen. No specific suppression feature could be associated with suppressors near to 2f1-f2. The frequency selectivity of the acoustic DP generation mechanism shown by this study indicates a close association with the transduction mechanism. The demonstration of comparable signals in gerbil and man facilitates the direct transfer of laboratory results to the study of human ears.
在沙鼠和人的耳道中测量了耳声发射畸变产物2f1-f2的抑制调谐特性。结果表明，在这两个物种中，声学响应都能以类似的、频率依赖的方式被抑制。接近刺激音频率的频率在抑制响应方面最为有效。导出的等抑制调谐曲线的Q10dB值在1到6之间。频率接近f2（较高频率刺激）的抑制音对调谐曲线的贡献在很大程度上与刺激强度和两个主音之间的频率比无关。具有与f1相关频率的抑制音产生的抑制量取决于所选择的刺激参数。在接近2f1-f2的抑制音中未发现特定的抑制特征。本研究显示的声学DP产生机制的频率选择性表明其与转导机制密切相关。在沙鼠和人中证明了类似的信号，这有助于将实验室结果直接应用于人类耳朵的研究。
