Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge, CB2 3EB United Kingdom.
J Acoust Soc Am. 2011 Jul;130(1):334-49. doi: 10.1121/1.3585848.
Temporal fine structure (TFS) sensitivity, frequency selectivity, and speech reception in noise were measured for young normal-hearing (NHY), old normal-hearing (NHO), and hearing-impaired (HI) subjects. Two measures of TFS sensitivity were used: the "TFS-LF test" (interaural phase difference discrimination) and the "TFS2 test" (discrimination of harmonic and frequency-shifted tones). These measures were not significantly correlated with frequency selectivity (after partialing out the effect of audiometric threshold), suggesting that insensitivity to TFS cannot be wholly explained by a broadening of auditory filters. The results of the two tests of TFS sensitivity were significantly but modestly correlated, suggesting that performance of the tests may be partly influenced by different factors. The NHO group performed significantly more poorly than the NHY group for both measures of TFS sensitivity, but not frequency selectivity, suggesting that TFS sensitivity declines with age in the absence of elevated audiometric thresholds or broadened auditory filters. When the effect of mean audiometric threshold was partialed out, speech reception thresholds in modulated noise were correlated with TFS2 scores, but not measures of frequency selectivity or TFS-LF test scores, suggesting that a reduction in sensitivity to TFS can partly account for the speech perception difficulties experienced by hearing-impaired subjects.
我们对年轻正常听力（NHY）、年老正常听力（NHO）和听力障碍（HI）受试者的时间精细结构（TFS）敏感性、频率选择性和噪声下的言语接受能力进行了测量。使用了两种 TFS 敏感性测量方法：“TFS-LF 测试”（两耳相位差辨别）和“TFS2 测试”（谐波和频率偏移音的辨别）。这些测量方法与频率选择性（在部分排除听力阈值的影响后）没有显著相关性，这表明 TFS 不敏感不能完全用听觉滤波器的展宽来解释。TFS 敏感性的两项测试结果呈显著但适度的相关性，表明测试的表现可能部分受到不同因素的影响。在 TFS 敏感性的两项测量中，NHO 组的表现均明显逊于 NHY 组，但在频率选择性方面却没有差异，这表明在没有升高的听力阈值或扩大的听觉滤波器的情况下，TFS 敏感性会随年龄增长而下降。当平均听力阈值的影响被部分排除后，调制噪声中的言语接受阈值与 TFS2 得分相关，但与频率选择性测量或 TFS-LF 测试得分无关，这表明 TFS 敏感性的降低可以部分解释听力障碍受试者的言语感知困难。
