Perceptual learning following changes in the frequency-to-electrode assignment with the Nucleus-22 cochlear implant
Perceptual learning following changes in the frequency-to-electrode assignment with the Nucleus-22 cochlear implant
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DOI：
10.1121/1.1502901
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发表时间：
2002-10-01
影响因子：
2.4
通讯作者：
Galvin, JJ
中科院分区：
文献类型：
--
作者：
Fu, QJ;Shannon, RV;Galvin, JJ
本研究的目的是调查经验丰富的人工耳蜗使用者在语音处理器中对频率-电极分配的适应时间过程。在三个月的时间里，对三名核子-22人工耳蜗使用者的语音识别性能进行了测量，在此期间，植入听者连续佩戴“实验”语音处理器，这些语音处理器相对于正常处理器的频率-电极分配有针对性地移动了2-4毫米。在使用实验处理器之前，使用临床指定的语音处理器测量每个受试者的基线语音表现。在3个月的测试期后，在重新安装临床分配的处理器设置后立即再次测量基线语音表现。使用实验处理器的语音表现在第一周测量了四次，之后在三个月的时间里每周测量一次。结果表明，实验处理器在实现后立即在语音识别的所有措施上产生了显着降低的性能。在3个月的测试期间，实验处理器的辅音和HINT句子识别逐渐接近与临床分配处理器的基线和实验后测量水平相当但仍显着低于。然而，即使在3个月的实验期结束时，实验处理器对元音和TIMIT句子的识别仍然远远低于基线测量的水平。在与实验处理器匹配之前或之后，临床指定处理器的性能没有显着变化。结果表明，至少在3个月的时间内，长时间暴露于一种新的刺激模式可能无法弥补刺激张力位移2-4毫米所造成的性能缺陷。(C) 2002美国声学学会。
The goal of the present study was to investigate the time course of adaptation by experienced cochlear implant users to a shifted frequency-to-electrode assignment in their speech processors. Speech recognition performance of three Nucleus-22 cochlear implant users was measured over a 3-month period, during which the implant listeners continuously wore "experimental" speech processors that were purposely shifted by 2-4 mm in terms of the frequency-to-electrode assignment relative to their normal processor. Baseline speech performance was measured with each subject's clinically assigned speech processor just prior to implementation of the experimental processor. Baseline speech performance was measured again after the 3-month test period, immediately following the reinstallation of the clinically assigned processor settings. Speech performance with the experimental processor was measured four times during the first week, and weekly thereafter over the 3-month period. Results showed that the experimental processor produced significantly lower performance on all measures of speech recognition immediately following implementation. Over the 3-month test period, consonant and HINT sentence recognition with the experimental processors gradually approached a performance level comparable to but still significantly below the baseline and postexperiment measures made with the clinically assigned processor. However, vowel and TIMIT sentence recognition with the experimental processors remained far below the level of the baseline measures even at the end of the 3-month experimental period. There was no significant change in performance with the clinically assigned processor before or after fitting with the experimental processor. The results suggest that a long-time exposure to a new pattern of stimulation may not be able to compensate for the deficit in performance caused by a 2-4-mm shift in the tonotopic location of stimulation, at least within a 3-month period. (C) 2002 Acoustical Society of America.