Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
J Acoust Soc Am. 2011 Feb;129(2):801-6. doi: 10.1121/1.3523287.
Distortion-product otoacoustic emissions (DPOAEs) were used to describe suppression growth in normal-hearing humans. Data were collected at eight f(2) frequencies ranging from 0.5 to 8 kHz for L(2) levels ranging from 10 to 60 dB sensation level. For each f(2) and L(2) combination, suppression was measured for nine or eleven suppressor frequencies (f(3)) whose levels varied from -20 to 85 dB sound pressure level (SPL). Suppression grew nearly linearly when f(3) ≈ f(2), grew more rapidly for f(3) < f(2), and grew more slowly for f(3) > f(2). These results are consistent with physiological and mechanical data from lower animals, as well as previous DPOAE data from humans, although no previous DPOAE study has described suppression growth for as wide a range of frequencies and levels. These trends were evident for all f(2) and L(2) combinations; however, some exceptions were noted. Specifically, suppression growth rate was less steep as a function of f(3) for f(2) frequencies ≤ 1 kHz. Thus, despite the qualitative similarities across frequency, there were quantitative differences related to f(2), suggesting that there may be subtle differences in suppression for frequencies above 1 kHz compared to frequencies below 1 kHz.
畸变产物耳声发射（DPOAE）用于描述正常听力人群中的抑制增长。在 0.5 至 8 kHz 的 8 个 f(2)频率和 10 至 60 dB 感觉水平的 L(2)水平下收集数据。对于每个 f(2)和 L(2)组合，测量了九个或十一个抑制器频率（f(3)）的抑制，其水平从-20 到 85 dB 声压级（SPL）不等。当 f(3)≈f(2)时，抑制几乎呈线性增长，当 f(3)<f(2)时，抑制增长更快，当 f(3)>f(2)时，抑制增长更慢。这些结果与来自低等动物的生理和机械数据以及来自人类的先前 DPOAE 数据一致，尽管以前没有 DPOAE 研究描述过如此广泛的频率和水平范围内的抑制增长。这些趋势在所有 f(2)和 L(2)组合中都很明显；然而，也注意到了一些例外。具体来说，当 f(2)频率≤1 kHz 时，f(3)的抑制增长率作为函数的斜率较小。因此，尽管在频率上存在定性相似性，但与 f(2)相关的存在定量差异，这表明与 1 kHz 以下的频率相比，1 kHz 以上的频率的抑制可能存在细微差异。
