Berg Katelyn, Goldsworthy Ray, Noble Jack, Dawant Benoit, Gifford René
Vanderbilt University, Nashville, Tennessee 37232, USA.
University of Southern California, Los Angeles, California 90033, USA.
J Acoust Soc Am. 2024 Dec 1;156(6):4289-4302. doi: 10.1121/10.0034603.
This study (1) characterized the effects of channel interaction using spectral blurring, (2) evaluated an image-guided electrode selection (IGES) method aiming to reduce channel interaction, and (3) investigated the impact of electrode placement factors on the change in performance by condition. Twelve adult MED-EL (Innsbruck, Austria) cochlear implant recipients participated. Performance was compared across six conditions: baseline (no blurring), all blurred, apical blurred, middle blurred, basal blurred, and IGES. Electrode placement information was calculated from post-insertion computerized tomography (CT) imaging. Each condition tested measures of speech recognition and subjective ratings. Results showed poorer performance when spectral blurring was applied to all channels compared to baseline, suggesting an increase in channel interaction was achieved. Vowel recognition was more sensitive to apical and middle blurring while consonant recognition was more sensitive to basal blurring, indicating that phoneme identification may be useful for assessing channel interaction clinically. IGES did not significantly improve group performance, and electrode placement factors did not impact results. However, participants who were more affected by spectral blurring tended to benefit more from IGES. These findings indicate that spectral blurring can help identify areas most affected by channel interaction to help optimize electrode selection.
本研究(1)使用频谱模糊来表征通道相互作用的影响，(2)评估一种旨在减少通道相互作用的图像引导电极选择(IGES)方法，以及(3)研究电极放置因素对不同条件下性能变化的影响。12名成年MED-EL(奥地利因斯布鲁克)人工耳蜗植入受者参与了研究。对六种条件下的性能进行了比较：基线(无模糊)、全部模糊、顶部模糊、中部模糊、基部模糊和IGES。电极放置信息通过插入后计算机断层扫描(CT)成像计算得出。每种条件下都测试了语音识别和主观评分指标。结果显示，与基线相比，当对所有通道应用频谱模糊时性能较差，这表明通道相互作用增加。元音识别对顶部和中部模糊更敏感，而辅音识别对基部模糊更敏感，这表明音素识别可能有助于临床评估通道相互作用。IGES并没有显著提高组内性能，电极放置因素也没有影响结果。然而，受频谱模糊影响更大的参与者往往从IGES中获益更多。这些发现表明，频谱模糊有助于识别受通道相互作用影响最大的区域，以帮助优化电极选择。
