Suprathreshold auditory processing deficits in noise: Effects of hearing loss and age
Suprathreshold auditory processing deficits in noise: Effects of hearing loss and age
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DOI：
10.1016/j.heares.2015.10.004
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发表时间：
2016-01-01
期刊：
影响因子：
2.8
通讯作者：
Ewert, Stephan D.
中科院分区：
文献类型：
--
作者：
Kortlang, Steffen;Mauermann, Manfred;Ewert, Stephan D.
感觉神经性听力损失患者在复杂的听觉环境下理解语言的能力通常会下降，尤其是在有背景噪音的情况下。除了可听性丧失外，还可能涉及阈上处理缺陷的混合，如基底膜压缩改变和相关变化，以及时间编码能力降低。在0.5、2和6 kHz频率下，对18名受试者进行了6组单耳心理声学实验，将其平均分为听力正常的青年、听力正常的老年和听力受损的老年听者，旨在探讨年龄和听力损失对噪声环境下心理声学表现的影响。建议在宽带噪声中使用低速率调制器的随机调频检测阈值（RFMDTs），以及从随机相位谐波复音中区分相位抖动施罗德相位来表征个体的时间处理能力。将结果与纯音和窄带噪声阈值、响度增长函数、听觉滤波器带宽和噪声中音检测阈值进行比较。在500 Hz时，结果表明时间精细结构（TFS）对纯音检测阈值的贡献。与听觉阈值和滤波器带宽显著相关表明频率选择性对宽带噪声下TFS可用性的影响。在控制阈值灵敏度的影响下，听者的年龄与噪声中音检测和500 Hz噪声中的rfmdt显著相关，表明年龄较大的听者特别受低载波背景噪声的影响。(C) 2015 Elsevier B.V.版权所有
People with sensorineural hearing loss generally suffer from a reduced ability to understand speech in complex acoustic listening situations, particularly when background noise is present. In addition to the loss of audibility, a mixture of suprathreshold processing deficits is possibly involved, like altered basilar membrane compression and related changes, as well as a reduced ability of temporal coding. A series of 6 monaural psychoacoustic experiments at 0.5, 2, and 6 kHz was conducted with 18 subjects, divided equally into groups of young normal-hearing, older normal-hearing and older hearing-impaired listeners, aiming at disentangling the effects of age and hearing loss on psychoacoustic performance in noise. Random frequency modulation detection thresholds (RFMDTs) with a low-rate modulator in wide band noise, and discrimination of a phase-jittered Schroeder-phase from a random-phase harmonic tone complex are suggested to characterize the individual ability of temporal processing. The outcome was compared to thresholds of pure tones and narrow-band noise, loudness growth functions, auditory filter bandwidths, and tone-in-noise detection thresholds. At 500 Hz, results suggest a contribution of temporal fine structure (TFS) to pure-tone detection thresholds. Significant correlation with auditory thresholds and filter bandwidths indicated an impact of frequency selectivity on TFS usability in wide band noise. When controlling for the effect of threshold sensitivity, the listener's age significantly correlated with tone-in-noise detection and RFMDTs in noise at 500 Hz, showing that older listeners were particularly affected by background noise at low carrier frequencies. (C) 2015 Elsevier B.V. All rights reserved.