AUDITORY FILTER SHAPES IN NORMAL-HEARING, NOISE-MASKED NORMAL, AND ELDERLY LISTENERS
AUDITORY FILTER SHAPES IN NORMAL-HEARING, NOISE-MASKED NORMAL, AND ELDERLY LISTENERS
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DOI：
10.1121/1.405810
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发表时间：
1993-05-01
影响因子：
2.4
通讯作者：
HUMES, LE
中科院分区：
文献类型：
--
作者：
SOMMERS, MS;HUMES, LE
为了分离年龄和听力损伤对频率选择性变化的影响，在2 kHz下测量了四组受试者的听觉滤波器形状：（1）听力正常的年轻受试者;（2）听力正常的老年受试者;（3）老年听力受损的听众;和（4）模拟听力损失的年轻听力正常的听众。使用陷波噪声程序的修改版本导出滤波器形状[Bruberg和摩尔，Hear，Res.47，103-138（1990）]。听觉滤波器的等效矩形带宽（ERB）在2 kHz听力正常的年轻人和老年人中没有显着差异。此外，滤波器宽度为20-和40-dB的模拟听力损失的年轻受试者与老年受试者获得相应程度的实际听力损失重叠。一项确实显示实际听力损失和模拟听力损失之间存在显着差异的措施是滤波器不对称的程度;听力受损的听众中的听觉滤波器比从噪声掩蔽的正常听力受试者中获得的听觉滤波器更不对称。听觉滤波器的动态范围，但是，听力受损和噪声掩蔽的听众。最后，对于具有相同听力水平的年轻受试者和老年受试者，滤波器后检测效率也相似。这些研究结果表明，老年人经常报告的频率选择性降低主要归因于听力损失，而不是年龄增加。结果对老年人言语知觉的影响和模型
To dissociate the effects of age and hearing impairment on changes in frequency selectivity, auditory filter shapes were measured at 2 kHz in four groups of subjects: ( 1) normal-hearing young subjects; (2) normal-hearing elderly subjects; (3) elderly hearing-impaired listeners; and (4) young normal-hearing listeners with simulated hearing losses. Filter shapes were derived using a modified version of the notched-noise procedure [Glasberg and Moore, Hear, Res. 47, 103-138 (1990)]. Equivalent rectangular bandwidths (ERBs) of auditory filters were not significantly different in young and elderly subjects with normal 2-kHz hearing. Furthermore, filter widths for young subjects with 20- and 40-dB simulated hearing losses overlapped with those obtained from elderly subjects with corresponding degrees of actual hearing loss. One measure that did show significant differences between actual and simulated hearing losses was the degree of filter asymmetry; auditory filters in hearing-impaired listeners were more asymmetrical than those obtained from noise-masked normal-hearing subjects. The dynamic range of auditory filters, however, was comparable for hearing-impaired and noise-masked listeners. Lastly, post-filter detection efficiency was also similar for young and elderly subjects with equivalent hearing levels. These findings suggest that the reduced frequency selectivity often reported for older listeners can be attributed, primarily, to hearing loss rather than increased age. Implications of the results for speech perception in the elderly and models of