Within- and across-channel gap detection in cochlear implant listeners
Within- and across-channel gap detection in cochlear implant listeners
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DOI：
10.1121/1.2793608
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发表时间：
2007-12-01
影响因子：
2.4
通讯作者：
Buss, Emily
中科院分区：
文献类型：
--
作者：
Grose, John H.;Buss, Emily
本研究检查了MED-EL COMBI 40+人工耳蜗植入体的成功用户的颞隙的电极通道内和跨电极通道处理。第一个实验测试了四个听众与双边植入的跨耳间隙持续时间歧视（GDD）。结果表明，跨耳GDD阈值升高相对于单耳，内电极通道的阈值，阈值偏移的大小是大致相同的单耳，跨电极通道配置。实验我还证明了通道不对称标记的GDD性能下降。第二个实验测试了包络波动对单个电极通道上携带的单耳标记的间隙检测（GD）的影响。五个人工耳蜗植入者的结果表明，与50 Hz宽带噪声相关的包络线比与300 Hz宽带噪声相关的包络线导致更差的GD阈值。在这两种情况下，GD阈值改善时，包络波动被压缩的指数为0.2。这两个实验的结果平行发现的声学听力，因此表明，时间处理的差距在很大程度上是有限的因素，中央耳蜗。(c)2007年，美国声学学会。
This study examined within- and across-electrode-channel processing of temporal gaps in successful users of MED-EL COMBI 40+ cochlear implants. The first experiment tested across-ear gap duration discrimination (GDD) in four listeners with bilateral implants. The results demonstrated that across-ear GDD thresholds are elevated relative to monaural, within-electrode-channel thresholds; the size of the threshold shift was approximately the same as for monaural, across-electrode-channel configurations. Experiment I also demonstrated a decline in GDD performance for channel-asymmetric markers. The second experiment tested the effect of envelope fluctuation on gap detection (GD) for monaural markers carried on a single electrode channel. Results from five cochlear implant listeners indicated that envelopes associated with 50-Hz wide bands of noise resulted in poorer GD thresholds than envelopes associated with 300-Hz wide bands of noise. In both cases GD thresholds improved when envelope fluctuations were compressed by an exponent of 0.2. The results of both experiments parallel those found for acoustic hearing, therefore suggesting that temporal processing of gaps is largely limited by factors central to the cochlea. (c) 2007 Acoustical Society of America.