The effect of increased channel interaction on speech perception with cochlear implants.
The effect of increased channel interaction on speech perception with cochlear implants.
复制标题
通道相互作用增加对与人工耳蜗植入物语音感知的影响。
DOI：
10.1038/s41598-021-89932-8
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发表时间：
2021-05-17
影响因子：
4.6
通讯作者：
Carlyon RP
中科院分区：
文献类型：
--
作者：
Goehring T;Archer-Boyd AW;Arenberg JG;Carlyon RP
耳蜗植入物（CI）是一种神经假体，可部分恢复重度至极重度听力损失患者的听力。虽然CI可以在安静的听力环境中为许多人提供良好的语音感知，但对于大多数听众来说，在干扰声音的环境中，它们无法做到这一点。先前的研究表明，这是由于CI电极通道之间的有害相互作用效应，限制了它们传递频率特异性信息的功能，但证据仍然很少。在这项研究中，一个实验操作称为频谱模糊，以增加通道的互动，在CI听众使用先进的仿生设备与HiFocus 1J和MS电极阵列，直接调查其对语音感知的因果关系。与标准CI处理中的每个通道使用单个电极不同，频谱模糊同时使用每个通道多达6个电极，以增加相邻频率通道之间的重叠，这在严重通道相互作用的情况下会发生。结果表明，这种操作显着降低CI语音感知在安静的15%和语音接收阈值在串音噪声5分贝时，所有的通道被模糊的一个因素为6。重要的是，当仅在电极子集上增加通道交互时，语音评分大多不受影响，并且仅在5个最顶端通道模糊时才显著降低。这些顶端通道在电极阵列的顶端传递高达1 kHz的信息，并且通常位于约250 °至500°的角插入深度处。这些结果证实并扩展了早期的发现，表明CI语音感知可能不会受益于沿着阵列沿着去激活各个通道，并且应该努力减少通道相互作用本身，特别是对于最顶端的电极。因此，因果关系的方法，如频谱模糊可以在未来的研究中使用，以控制信道的相互作用影响的听众评估补偿策略。
Cochlear implants (CIs) are neuroprostheses that partially restore hearing for people with severe-to-profound hearing loss. While CIs can provide good speech perception in quiet listening situations for many, they fail to do so in environments with interfering sounds for most listeners. Previous research suggests that this is due to detrimental interaction effects between CI electrode channels, limiting their function to convey frequency-specific information, but evidence is still scarce. In this study, an experimental manipulation called spectral blurring was used to increase channel interaction in CI listeners using Advanced Bionics devices with HiFocus 1J and MS electrode arrays to directly investigate its causal effect on speech perception. Instead of using a single electrode per channel as in standard CI processing, spectral blurring used up to 6 electrodes per channel simultaneously to increase the overlap between adjacent frequency channels as would occur in cases with severe channel interaction. Results demonstrated that this manipulation significantly degraded CI speech perception in quiet by 15% and speech reception thresholds in babble noise by 5 dB when all channels were blurred by a factor of 6. Importantly, when channel interaction was increased just on a subset of electrodes, speech scores were mostly unaffected and were only significantly degraded when the 5 most apical channels were blurred. These apical channels convey information up to 1 kHz at the apical end of the electrode array and are typically located at angular insertion depths of about 250 up to 500°. These results confirm and extend earlier findings indicating that CI speech perception may not benefit from deactivating individual channels along the array and that efforts should instead be directed towards reducing channel interaction per se and in particular for the most-apical electrodes. Hereby, causal methods such as spectral blurring could be used in future research to control channel interaction effects within listeners for evaluating compensation strategies.
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