Tyler Richard S, Witt Shelley A, Dunn Camille C, Perreau Ann, Parkinson Aaron J, Wilson Blake S
Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242-1078, USA.
J Am Acad Audiol. 2010 Jan;21(1):52-65. doi: 10.3766/jaaa.21.1.7.
The purpose of this investigation was to determine if adult bilateral cochlear implant recipients could benefit from using a speech processing strategy in which the input spectrum was interleaved among electrodes across the two implants.
Two separate experiments were conducted. In both experiments, subjects were tested using a control speech processing strategy and a strategy in which the full input spectrum was filtered so that only the output of half of the filters was audible to one implant, while the output of the alternative filters was audible to the other implant. The filters were interleaved in a way that created alternate frequency "holes" between the two cochlear implants.
In experiment one, four subjects were tested on consonant recognition. Results indicated that one of the four subjects performed better with the interleaved strategy, one subject received a binaural advantage with the interleaved strategy that they did not receive with the control strategy, and two subjects showed no decrement in performance when using the interleaved strategy. In the second experiment, 11 subjects were tested on word recognition, sentences in noise, and localization (it should be noted that not all subjects participated in all tests). Results showed that for speech perception testing one subject achieved significantly better scores with the interleaved strategy on all tests, and seven subjects showed a significant improvement with the interleaved strategy on at least one test. Only one subject showed a decrement in performance on all speech perception tests with the interleaved strategy. Out of nine subjects, one subject preferred the sound quality of the interleaved strategy. No one performed better on localization with the interleaved strategy.
Data from this study indicate that some adult bilateral cochlear implant recipients can benefit from using a speech processing strategy in which the input spectrum is interleaved among electrodes across the two implants. It is possible that the subjects in this study who showed a significant improvement with the interleaved strategy did so because of less channel interaction; however, this hypothesis was not directly tested.
本研究的目的是确定成年双侧人工耳蜗植入受者是否能从一种语音处理策略中获益，该策略将输入频谱交错分布在两个植入体的电极之间。
进行了两项独立实验。在两项实验中，均使用一种对照语音处理策略和另一种策略对受试者进行测试，在后一种策略中，对完整的输入频谱进行滤波，使得只有一半滤波器的输出能被一个植入体听到，而另一半滤波器的输出能被另一个植入体听到。滤波器以在两个人工耳蜗植入体之间形成交替频率“空洞”的方式交错排列。
在实验一中，对4名受试者进行了辅音识别测试。结果表明，4名受试者中有1名在采用交错策略时表现更好，1名受试者在采用交错策略时获得了双耳优势，而在对照策略中未获得此优势，另外2名受试者在使用交错策略时表现没有下降。在第二项实验中，对11名受试者进行了单词识别、噪声中的句子识别和定位测试（应注意，并非所有受试者都参与了所有测试）。结果显示，对于言语感知测试，1名受试者在所有测试中采用交错策略时得分显著更高，7名受试者在至少一项测试中采用交错策略时表现有显著改善。只有1名受试者在所有言语感知测试中采用交错策略时表现下降。在9名受试者中，有1名受试者更喜欢交错策略的音质。没有人在采用交错策略时定位表现更好。
本研究数据表明，一些成年双侧人工耳蜗植入受者可从一种语音处理策略中获益，该策略将输入频谱交错分布在两个植入体的电极之间。本研究中采用交错策略表现有显著改善的受试者可能是因为通道间相互作用减少；然而，这一假设未得到直接验证。
