Lexical tone perception with HiResolution and HiResolution 120 sound-processing strategies in pediatric Mandarin-speaking cochlear implant users.
Lexical tone perception with HiResolution and HiResolution 120 sound-processing strategies in pediatric Mandarin-speaking cochlear implant users.
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DOI：
10.1097/aud.0b013e31819342cf
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发表时间：
2009-04
期刊：
影响因子：
3.7
通讯作者：
Xu L
中科院分区：
文献类型：
--
作者：
Han D;Liu B;Zhou N;Chen X;Kong Y;Liu H;Zheng Y;Xu L
人工耳蜗使用者的声调识别能力较差。HiResolution（HiRes）声音处理策略旨在更好地保留声学信号的时间精细结构或详细包络信息。较新的HiRes 120策略通过增加传递给植入体用户的潜在光谱信息量来构建HiRes。本研究的目的是探讨母语为汉语的儿童与人工耳蜗植入使用HiRes和HiRes 120声音处理策略的词汇声调识别。在基线时使用HiRes测试声调识别性能，然后在相同受试者中使用HiRes 120体验长达6个月后测试声调识别性能。二十prelinguished，母语为普通话的儿童，年龄从3.5至16.5岁，参加了。所有儿童在三种情况下完成计算机色调对比测试：（1）在转换为HiRes 120之前立即使用HiRes（基线），（2）转换后1个月，（3）转换后3个月。20名儿童中有12名在转换后6个月进行了测试。此外，18名儿童的父母在3个月随访时完成了一份问卷调查，内容涉及声音处理策略的偏好以及儿童使用HiRes 120进行听觉感知和言语产生各方面相关体验。作为一个组，使用HiRes和HiRes 120的音调识别分数之间没有统计学显著差异。个体得分差异很大。音调识别性能从偶然（50%正确）到近乎完美。使用传统的HiRes策略，20名儿童中有6名实现了高水平的音调识别性能（即，正确率≥90%），而7例的水平与偶然性无显著差异（正确率为50-60%）。在最后的测试中，无论是转换后3个月或6个月，所有儿童都达到了与HiRes 120相同或更好的音调识别性能，尽管一些儿童的音调识别性能在最初的1个月或3个月随访间隔比基线更差。20名儿童中有8名在至少一次随访测试中显示出HiRes 120的音调识别性能有统计学显着改善。植入时的年龄与所有四个测试间隔的音调识别性能相关。大多数孩子的父母表示，孩子们更喜欢HiRes 120。作为一个组，HiRes 120与HiRes相比没有提供显著改善的词汇音调识别，至少在整个研究期间（长达6个月）。在使用HiRes或HiRes 120的人工耳蜗植入的prelinguished，母语为普通话的儿童中，词汇音调识别存在很大的个体差异。20名儿童中有6名在基线HiRes条件下达到或接近上限。在其余的人中，当随后用HiRes 120进行测试时，大约一半的人显示出明显更好的音调识别，尽管这种改善的程度可能归因于处理策略变化以外的因素（例如，一般发展情况未知。从HiRes 120中受益最多的儿童往往是那些在年轻时植入的儿童。
Lexical tone recognition tends to be poor in cochlear implant users. The HiResolution (HiRes) sound-processing strategy is designed to better preserve temporal fine structure, or the detailed envelope information, of an acoustic signal. The newer HiRes 120 strategy builds on HiRes by increasing the amount of potential spectral information delivered to the implant user. The purpose of this study was to examine lexical tone recognition in native Mandarin Chinese-speaking children with cochlear implants using the HiRes and HiRes 120 sound-processing strategies. Tone recognition performance was tested with HiRes at baseline and then after up to 6 mo of HiRes 120 experience in the same subjects. Twenty prelingually deafened, native Mandarin-speaking children, with ages ranging from 3.5 to 16.5 yr, participated. All children completed a computerized tone contrast test on three occasions: (1) using HiRes immediately before conversion to HiRes 120 (baseline), (2) 1 mo after conversion, and (3) 3 mo after conversion. Twelve of the 20 children also were tested 6 mo after conversion. In addition, the parents of 18 children completed a questionnaire at the 3-mo follow-up visit regarding the preference of sound-processing strategies and the children's experience related to various aspects of auditory perception and speech production using HiRes 120. As a group, no statistically significant differences were seen between the tone recognition scores using HiRes and HiRes 120. Individual scores showed great variability. Tone recognition performance ranged from chance (50% correct) to nearly perfect. Using the conventional HiRes strategy, 6 of the 20 children achieved high-level tone recognition performance (i.e., ≥90% correct), whereas 7 performed at a level not significantly different from chance (50–60% correct). At the final test, either 3 or 6 mo after conversion, all children achieved tone recognition performance with HiRes 120 that was equal to or better than that with HiRes, although some children's tone recognition performance was worse initially at the 1 or 3 mo follow-up intervals than at baseline. Eight of the 20 children showed statistically significant improvement in tone recognition performance with HiRes 120 on at least one of the follow-up tests. Age at implantation was correlated with tone recognition performance at all four test intervals. Parents of most of the children indicated that the children preferred HiRes 120 more than HiRes. As a group, HiRes 120 did not provide significantly improved lexical tone recognition compared to HiRes, at least throughout the length of the study (up to 6 mo). There were large individual differences in lexical tone recognition among the prelingually deafened, native Mandarin-speaking children with cochlear implants using either HiRes or HiRes 120. Six of the 20 children performed at or near ceiling in the baseline HiRes condition. Of the remainder, approximately half showed significantly better tone recognition when subsequently tested with HiRes 120, although the extent to which this improvement may be attributable to factors other than the change in processing strategy (e.g., general development) is unknown. The children who benefited most from HiRes 120 tended to be those who were implanted at younger ages.