Transmission of Binaural Cues by Bilateral Cochlear Implants: Examining the Impacts of Bilaterally Independent Spectral Peak-Picking, Pulse Timing, and Compression.
Transmission of Binaural Cues by Bilateral Cochlear Implants: Examining the Impacts of Bilaterally Independent Spectral Peak-Picking, Pulse Timing, and Compression.
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DOI：
10.1177/23312165211030411
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发表时间：
2021-01
影响因子：
2.7
通讯作者：
Brown AD
中科院分区：
文献类型：
--
作者：
Gray WO;Mayo PG;Goupell MJ;Brown AD
听觉听者使用双耳提示--耳间时间差(ITD)和耳间电平差(ILDS)--来定位和隔离水平面上的声源。人工耳蜗使用者现在通常会接受两个植入物(双侧耳蜗植入物[BiCIS])，而不是一个，目的是提供获得这些线索的途径。然而，BICI的听众经常遇到双耳任务的困难。大多数BiCIS在每只耳朵上使用独立的声音处理器；经常有人提出，这种独立性可能会降低双耳信号的传输，特别是ITD。在这里，我们报告了双耳线索传输的经验测量通过BiCIS实施常见的“n-of-m”频谱峰值选择刺激策略。完成了对语音和非语音刺激的测量，这些刺激呈现给一个安装了BICI声音处理器的声学假人。BiCIS的电子输出和模特的入耳式麦克风的声音输出被同时记录下来，从而能够比较电子和声音双耳提示。对于远离中线的源位置，BICI双耳线索，特别是包络ITD线索，被发现被不对称的谱峰选取所退化。此外，由于非线性水平映射导致的脉冲幅度饱和在较高的呈现水平产生较小的ILD。最后，虽然单个脉冲传递的是虚假的“漂移”的ITD，与独立的左右处理器时钟一致，但这种变化在传输的包络ITD中并不明显。结果指出了改进BICI技术的途径，并可能被证明对解释先前和未来研究中报告的BICI空间听力结果有用。
Acoustic hearing listeners use binaural cues—interaural time differences (ITDs) and interaural level differences (ILDs)—for localization and segregation of sound sources in the horizontal plane. Cochlear implant users now often receive two implants (bilateral cochlear implants [BiCIs]) rather than one, with the goal to provide access to these cues. However, BiCI listeners often experience difficulty with binaural tasks. Most BiCIs use independent sound processors at each ear; it has often been suggested that such independence may degrade the transmission of binaural cues, particularly ITDs. Here, we report empirical measurements of binaural cue transmission via BiCIs implementing a common “n-of-m” spectral peak-picking stimulation strategy. Measurements were completed for speech and nonspeech stimuli presented to an acoustic manikin “fitted” with BiCI sound processors. Electric outputs from the BiCIs and acoustic outputs from the manikin’s in-ear microphones were recorded simultaneously, enabling comparison of electric and acoustic binaural cues. For source locations away from the midline, BiCI binaural cues, particularly envelope ITD cues, were found to be degraded by asymmetric spectral peak-picking. In addition, pulse amplitude saturation due to nonlinear level mapping yielded smaller ILDs at higher presentation levels. Finally, while individual pulses conveyed a spurious “drifting” ITD, consistent with independent left and right processor clocks, such variation was not evident in transmitted envelope ITDs. Results point to avenues for improvement of BiCI technology and may prove useful in the interpretation of BiCI spatial hearing outcomes reported in prior and future studies.
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影响因子：
2.7
作者：
Holder JT;Reynolds SM;Sunderhaus LW;Gifford RH
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