Contribution of bimodal hearing to lexical tone normalization in Mandarin-speaking cochlear implant users.
Contribution of bimodal hearing to lexical tone normalization in Mandarin-speaking cochlear implant users.
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DOI：
10.1016/j.heares.2014.02.005
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发表时间：
2014-06
期刊：
影响因子：
2.8
通讯作者：
Chang, Ronald Y.
中科院分区：
文献类型：
--
作者：
Luo, Xin;Chang, Yi-ping;Lin, Chun-Yi;Chang, Ronald Y.
普通话听力正常者即使在说话人之间的音高变化很大的情况下，也可以利用语境和目标刺激之间的音高对比轻松地感知词汇音调。然而，目前尚不清楚是否耳蜗植入（CI）的用户与有限的访问音高线索可以类似地使用上下文音高线索的音调正常化。在这项研究中，母语普通话NH听众和pre-lingually单方面植入CI用户被要求识别一系列的普通话音调从音调1（高平坦）到音调2（中上升）有或没有前面的句子上下文。大多数CI受试者在非植入耳中使用助听器（HA）（即，双峰使用者），并且用单独的CI和CI+HA两者进行测试。在无语境测试中，大多数CI受试者都能观察到典型的S形声调识别功能，并且无论是单独CI还是CI+HA，其功能斜率和感知边界都相似。与NH受试者相比，CI受试者对目标音调的音高变化不太敏感。在有背景的测试中，NH受试者有更多的（分别是）。更少）音调-2响应在具有高（分别为低）基频，称为对比语境效应。对于CI受试者，一个类似的对比背景效应被发现具有统计学意义的音调识别与CI+HA，但不与CI单独。结果表明，从CI的音高线索可能不足以始终支持音调归一化的音高对比处理。然而，来自辅助残余声学听力的附加音高提示可以为CI用户提供与NH收听者类似的音调归一化能力。
Native Mandarin normal-hearing (NH) listeners can easily perceive lexical tones even under conditions of great voice pitch variations across speakers by using the pitch contrast between context and target stimuli. It is however unclear whether cochlear implant (CI) users with limited access to pitch cues can make similar use of context pitch cues for tone normalization. In this study, native Mandarin NH listeners and pre-lingually deafened unilaterally implanted CI users were asked to recognize a series of Mandarin tones varying from Tone 1 (high-flat) to Tone 2 (mid-rising) with or without a preceding sentence context. Most of the CI subjects used a hearing aid (HA) in the non-implanted ear (i.e., bimodal users) and were tested both with CI alone and CI+HA. In the test without context, typical S-shaped tone recognition functions were observed for most CI subjects and the function slopes and perceptual boundaries were similar with either CI alone or CI+HA. Compared to NH subjects, CI subjects were less sensitive to the pitch changes in target tones. In the test with context, NH subjects had more (resp. fewer) Tone-2 responses in a context with high (resp. low) fundamental frequencies, known as the contrastive context effect. For CI subjects, a similar contrastive context effect was found statistically significant for tone recognition with CI+HA but not with CI alone. The results suggest that the pitch cues from CIs may not be sufficient to consistently support the pitch contrast processing for tone normalization. The additional pitch cues from aided residual acoustic hearing can however provide CI users with a similar tone normalization capability as NH listeners.
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