Cochlear-Implant Simulated Signal Degradation Exacerbates Listening Effort in Older Listeners.
Cochlear-Implant Simulated Signal Degradation Exacerbates Listening Effort in Older Listeners.
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人工耳蜗模拟信号衰减会加剧老年听众的听力负担。
DOI：
10.1097/aud.0000000000001440
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发表时间：
2024
期刊：
影响因子：
3.7
通讯作者：
DeRoyMilvae,Kristina
中科院分区：
文献类型：
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作者：
Abramowitz,JordanC;Goupell,MatthewJ;DeRoyMilvae,Kristina
目标：接受人工耳蜗术(CI)的人经常报告说，倾听需要付出很高的努力。听力努力会随着频谱分辨率的降低而增加，当使用CI收听时就会发生这种情况，也可能会随着年龄的增长而增加。目前尚不清楚这些因素是否相互作用；与年轻的CI听众相比，年龄较大的CI听众可能会经历更高的听力努力和更大的信号劣化。设计：15名听力正常的年轻听者(18-31岁)和15名年长的听力正常听者(65-75岁)参加本实验，他们的听力阈值在0.25-4 kHz之间。参与者重复安静呈现的句子，这些句子要么是未经处理的，要么是语音编码的，模拟CI听力。刺激频谱被限制在4 kHz以下(以控制与年龄相关的高频听力损失的影响)，并且在32、16和8声道的情况下，通过减少声码器通道的数量来降低频谱分辨率。在这项任务中，记录了行为语音识别分数和瞳孔放大。结果：在句子被正确回忆的试验中，年龄和光谱分辨率之间存在显著的交互作用，在8声道和32声道声码条件下，听力正常的老年听者的瞳孔扩张明显更大。结论：年龄和光谱分辨率之间存在显著的交互作用，当信号高度退化时，年龄较大的听者表现出比年轻听者相对更高的听力努力，其中在八声道条件下观察到的影响最大。这项研究的临床意义是，年龄较大的听众可能面临更高的风险，因为CI增加了他们的听力努力。
Objectives:Individuals with cochlear implants (CIs) often report that listening requires high levels of effort. Listening effort can increase with decreasing spectral resolution, which occurs when listening with a CI, and can also increase with age. What is not clear is whether these factors interact; older CI listeners potentially experience even higher listening effort with greater signal degradation than younger CI listeners. This study used pupillometry as a physiological index of listening effort to examine whether age, spectral resolution, and their interaction affect listening effort in a simulation of CI listening.Design:Fifteen younger normal-hearing listeners (ages 18 to 31 years) and 15 older normal-hearing listeners (ages 65 to 75 years) participated in this experiment; they had normal hearing thresholds from 0.25 to 4 kHz. Participants repeated sentences presented in quiet that were either unprocessed or vocoded, simulating CI listening. Stimuli frequency spectra were limited to below 4 kHz (to control for effects of age-related high-frequency hearing loss), and spectral resolution was decreased by decreasing the number of vocoder channels, with 32-, 16-, and 8-channel conditions. Behavioral speech recognition scores and pupil dilation were recorded during this task. In addition, cognitive measures of working memory and processing speed were obtained to examine if individual differences in these measures predicted changes in pupil dilation.Results:For trials where the sentence was recalled correctly, there was a significant interaction between age and spectral resolution, with significantly greater pupil dilation in the older normal-hearing listeners for the 8-and 32-channel vocoded conditions. Cognitive measures did not predict pupil dilation.Conclusions:There was a significant interaction between age and spectral resolution, such that older listeners appear to exert relatively higher listening effort than younger listeners when the signal is highly degraded, with the largest effects observed in the eight-channel condition. The clinical implication is that older listeners may be at higher risk for increased listening effort with a CI.