The effect of fluctuating maskers on speech understanding of high-performing cochlear implant users
The effect of fluctuating maskers on speech understanding of high-performing cochlear implant users
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DOI：
10.3109/14992027.2015.1128124
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发表时间：
2016-05-03
影响因子：
2.7
通讯作者：
Hemmert, Werner
中科院分区：
文献类型：
--
作者：
Zirn, Stefan;Polterauer, Daniel;Hemmert, Werner
目的：本研究评估了人工耳蜗植入（CI）用户的基线性能较差或CI刺激的技术和/或生理特性是否是导致掩蔽释放缺失的原因。设计：本研究测量了连续和调制噪声中的语音接收阈值（SRT）作为信噪比（SNR）的函数。研究样本：共有24名受试者参与：12名听力正常（NH）的听众和12名受试者提供了最新的MED-EL CI系统。结果如下：CI用户在连续噪声中的平均SRT为-3.0 +/- 1.5 dB SNR（平均值+/- SEM），而正常听力组达到-5.9 +/- 0.8 dB SNR。在调制噪声中，各组之间的差异显著增加。对于CI用户，平均SRT恶化至-1.4 +/- 2.3 dB SNR，而对于正常听力的听众，平均SRT改善至-18.9 +/- 3.8 dB SNR。结论：本研究证实了先前研究显示的波动掩蔽对CI用户SRT的不利影响。总之，掩蔽释放的缺乏主要是由CI刺激的技术和/或生理特性引起的，而不仅仅是与正常听力受试者相比，许多CI用户的基线性能较差。在调制噪声中的语音理解是更强大的CI用户谁有一个相对较大的电动态范围。
Objective: The present study evaluated whether the poorer baseline performance of cochlear implant (CI) users or the technical and/or physiological properties of CI stimulation are responsible for the absence of masking release. Design: This study measured speech reception thresholds (SRTs) in continuous and modulated noise as a function of signal to noise ratio (SNR). Study sample: A total of 24 subjects participated: 12 normal-hearing (NH) listeners and 12 subjects provided with recent MED-EL CI systems. Results: The mean SRT of CI users in continuous noise was -3.0 +/- 1.5 dB SNR (mean +/- SEM), while the normal-hearing group reached -5.9 +/- 0.8 dB SNR. In modulated noise, the difference across groups increased considerably. For CI users, the mean SRT worsened to -1.4 +/- 2.3 dB SNR, while it improved for normal-hearing listeners to -18.9 +/- 3.8 dB SNR. Conclusions: The detrimental effect of fluctuating maskers on SRTs in CI users shown by prior studies was confirmed by the current study. Concluding, the absence of masking release is mainly caused by the technical and/or physiological properties of CI stimulation, not just the poorer baseline performance of many CI users compared to normal-hearing subjects. Speech understanding in modulated noise was more robust in CI users who had a relatively large electrical dynamic range.