Croghan Naomi B H, Duran Sara I, Smith Zachary M
Denver Research & Technology Labs, Cochlear Limited, 13059 East Peakview Avenue, Centennial, Colorado 80111, USA
J Acoust Soc Am. 2017 Dec;142(6):EL537. doi: 10.1121/1.5016044.
This study reconsiders the number of effective channels in contemporary cochlear implants. Subjects listened to matrix sentences with a competing talker using their clinical map (up to 22 electrodes) and reduced-channel maps using 12, 8, and 4 electrodes. Spectro-temporal modulation thresholds and reading span were measured to explore intersubject variability. Results show that speech understanding significantly improved with increasing active electrodes up to 22, particularly for subjects with better spectro-temporal resolution. These findings suggest some listeners may be able to utilize the full electrode array and may not be limited to eight channels of information as indicated in previous studies.
本研究重新审视了当代人工耳蜗有效通道的数量。受试者使用其临床图谱（最多22个电极）以及分别使用12个、8个和4个电极的减少通道图谱，收听伴有竞争谈话声的矩阵句子。测量了频谱-时间调制阈值和阅读广度，以探究个体间的变异性。结果表明，随着激活电极数量增加到22个，言语理解能力显著提高，尤其是对于频谱-时间分辨率较好的受试者。这些发现表明，一些听者可能能够利用完整的电极阵列，并且可能不像先前研究所表明的那样局限于八个信息通道。
