The relationship between speech perception and electrode discrimination in cochlear implantees
The relationship between speech perception and electrode discrimination in cochlear implantees
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DOI：
10.1121/1.1287711
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发表时间：
2000-09-01
影响因子：
2.4
通讯作者：
Clark, GM
中科院分区：
文献类型：
--
作者：
Henry, BA;McKay, CM;Clark, GM
使用语言可懂度指数（SII）程序测量15名使用者在5个频带（170-570、570-1170、1170-1768、1768-2680和2680-5744 Hz）感知的语言信息量，使用者使用了Cobaniar Ltd. CI-22 M植入体和Spectra-22/SPEAK处理器。感知的语音信息进行了比较，感知听力正常的听众。还研究了这些受试者区分对应于每个频带的相邻电极上的刺激的能力，使用4 IFC程序，其中随机电流水平变化在动态范围的0%和60%之间。相对于听力正常的听众，语音信息，平均而言，显着减少在170和2680 Hz之间的四个频率区域比在2680-5744 Hz的区域。电极辨别能力（当随机电平变化包含动态范围的20%或更多时）与在170和2680 Hz之间的四个频率区域中感知的语音信息量之间存在显著相关性。在2680-5744 Hz区域中没有这种相关性，无论随机电平变化的程度如何。这些结果表明，在低到中等频率的语音信息是更难被识别者感知，这一困难是相关的，在随机响度变化的存在下，在区分电极的位置的困难，和精细的频谱歧视可能是相对更重要的元音共振峰区域比在更高的频率区域。(C)2000年美国声学学会。【S0001-4966（00）01109-7】。
Speech Intelligibility Index (SII) procedures were used to measure the amount of speech information perceived in five frequency bands (170-570, 570-1170, 1170-1768, 1768-2680, and 2680-5744 Hz) by 15 users of the Cochlear Ltd. CI-22M implant and Spectra-22/SPEAK processor. The speech information perceived was compared to that perceived by normal-hearing listeners. The ability of these subjects to discriminate between stimulation on adjacent electrodes corresponding to each frequency band was also investigated, using a 4IFC procedure with random current level variations of between 0% and 60% of the dynamic range. Relative to normal-hearing listeners, speech information was, on average, significantly more reduced in the four frequency regions between 170 and 2680 Hz than in the region 2680-5744 Hz. There was a significant correlation between electrode discrimination ability (when the random level variation encompassed 20% or more of the dynamic range) and the amount of speech information perceived in the four frequency regions between 170 and 2680 Hz. There was no such correlation in the region 2680-5744 Hz, regardless of the extent of random level variation. These results indicate that speech information in the low to medium frequencies is more difficult for implantees to perceive, that this difficulty is correlated with the difficulty in discriminating electrode place in the presence of random loudness variations, and that fine spectral discrimination may be relatively more important in the vowel-formant regions than in higher frequency regions. (C) 2000 Acoustical Society of America. [S0001-4966(00)01109-7].