Frequency-place compression and expansion in cochlear implant listeners
Frequency-place compression and expansion in cochlear implant listeners
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DOI：
10.1121/1.1804627
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发表时间：
2004-11-01
影响因子：
2.4
通讯作者：
Shannon, RV
中科院分区：
文献类型：
--
作者：
Baskent, D;Shannon, RV
在多通道人工耳蜗中，低频信息被传递到耳蜗顶端位置，而高频信息被传递到更基底的位置，模仿听觉神经的正常声调组织。在临床实践中；很少有人关注声输入在单个患者电极上的分布，这些分布可能在间距和绝对音位位置方面有所不同。 Baskent 和 Shannon (J. Acoust. Soc. Am. 113, 2003) 在听力正常的听众中模拟了植入信号处理条件，其中分配给阵列的频率范围系统地比耳蜗中的模拟刺激范围更宽或更窄，从而分别导致频率位置压缩或扩展。一般来说，当输入声学信息以最小的频率位置失真传递到耳蜗中匹配的音调位置时，可以获得最佳的语音识别效果。本研究在 6 名 Med-El Combi 40+ 植入受试者中通过类似的频率位置操作测量了音素和句子识别分数。根据估计的电极插入深度，使用 Greenwood 映射函数估计刺激位置。尽管听觉神经的实际刺激部位存在不确定性，但植入物的频率位置压缩和扩张的结果与模拟结果相似，尤其是对于语后耳聋受试者。本研究表明，频率位置映射是种植体性能的重要因素，并且可以通过使用频率位置操作的功能测试来优化个体植入患者的映射。 (C) 2004 年美国声学学会。
In multichannel cochlear implants, low frequency information is delivered to apical cochlear locations while high frequency information is delivered to more basal locations, mimicking the normal acoustic tonotopic organization of the auditory nerves. In clinical practice; little attention has been paid to the distribution of acoustic input across the electrodes of an individual patient that might vary in terms of spacing and absolute tonotopic location. In normal-hearing listeners, Baskent and Shannon (J. Acoust. Soc. Am. 113, 2003) simulated implant signal processing conditions in which the frequency range assigned to the array was systematically made wider or narrower than the simulated stimulation range in the cochlea, resulting in frequency-place compression or expansion, respectively. In general, the best speech recognition was obtained when the input acoustic information was delivered to the matching tonotopic place in the cochlea with least frequency-place distortion. The present study measured phoneme and sentence recognition scores with similar frequency-place manipulations in six Med-El Combi 40+ implant subjects. Stimulation locations were estimated using the Greenwood mapping function based on the estimated electrode insertion depth. Results from frequency-place compression and expansion with implants were similar to simulation, results, especially for postlingually deafened subjects, despite the uncertainty in the actual stimulation sites of the auditory nerves. The present study shows that frequency-place mapping is an important factor in implant performance and an individual implant patient's map could be optimized with functional tests using frequency-place manipulations. (C) 2004 Acoustical Society of America.