Mandarin Tone and Vowel Recognition in Cochlear Implant Users: Effects of Talker Variability and Bimodal Hearing.
Mandarin Tone and Vowel Recognition in Cochlear Implant Users: Effects of Talker Variability and Bimodal Hearing.
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DOI：
10.1097/aud.0000000000000265
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发表时间：
2016-05
期刊：
影响因子：
3.7
通讯作者：
Luo X
中科院分区：
文献类型：
--
作者：
Chang YP;Chang RY;Lin CY;Luo X
对于非植入耳中残留低频声学听力的人工耳蜗 (CI) 用户来说，结合使用 CI 和对侧助听器 (HA) 的双模听力可能会比单独使用 CI 提供更显着的说话者语音提示，以处理试验中说话者身份的可变性。本研究测试了说话者变异性、双峰听力及其相互作用对 CI 用户普通话声调、元音和音节识别（即本研究中的普通话声调和元音识别相结合）的反应准确性和时间的影响。 15 名语前聋哑母语普通话 CI 用户（20 岁或以下）参与了这项研究。四名说话者各自以四种声调发出六个普通话单元音音节。刺激通过单个扬声器安静地呈现。为了研究说话者变异性的影响，在两种呈现条件下测试了普通话声调、元音和音节识别：根据说话者阻止刺激（说话者阻塞条件）或在不同试验中不同说话者混合刺激（混合说话者条件）。为了探索双模式听力的影响，测试了两种处理器条件：单独 CI 或 CI+HA。累积响应时间被记录为每种条件下认知负荷或听力努力的间接指标。计算人口统计/听力因素（例如非植入耳的听力阈值）和双峰性能/效益（其中双峰效益指单独 CI 和 CI+HA 之间的性能差异）之间的相关性。单独使用 CI 和 CI+HA 的普通话声调识别在混合说话者条件下明显比在阻塞说话者条件下差，而元音识别在两种呈现条件下相当。双模态听力显着改善了普通话声调识别，但没有改善元音识别。普通话音节识别受到说话者变异性和双峰听力的显着影响。与单独使用 CI 相比，使用 CI+HA 的累积响应时间显着缩短，但在说话者变异性方面保持不变。对于本研究中采用的任何表现测量，说话者变异性和双峰听力之间不存在相互作用。相关分析显示，普通话声调、元音和音节识别的双峰表现和益处无法通过非植入耳朵的听力阈值或参与者的人口统计因素来预测。在单独 CI 和 CI+HA 条件下，不同试验中说话者的变异性显着降低了普通话声调和音节识别性能。虽然双模态听力并没有减少说话者变异性对普通话声调和音节识别的影响，但当对侧 HA 与 CI 结合使用时，通常会观察到更好的普通话声调和音节识别性能以及更短的响应时间（较少听力努力的指标）。另一方面，元音识别并没有受到说话者变异性或双模态听力的显着影响，因为天花板效应无法从元音识别结果中计算出来。
For cochlear implant (CI) users with residual low-frequency acoustic hearing in the non-implanted ear, bimodal hearing combining the use of a CI and a contralateral hearing aid (HA) may provide more salient talker voice cues than CI alone to handle the variability of talker identity across trials. This study tested the effects of talker variability, bimodal hearing, and their interaction on response accuracy and time of CI users’ Mandarin tone, vowel, and syllable recognition (i.e., combined Mandarin tone and vowel recognition in this study). Fifteen prelingually deafened native Mandarin-speaking CI users (at age 20 or lower) participated in this study. Four talkers each produced six Mandarin single-vowel syllables in four lexical tones. The stimuli were presented in quiet via a single loudspeaker. To study the effects of talker variability, Mandarin tone, vowel, and syllable recognition was tested in two presentation conditions: with stimuli blocked according to talker (blocked-talker condition) or mixed across talkers from trial to trial (mixed-talker condition). To explore the effects of bimodal hearing, two processor conditions were tested: CI alone or CI+HA. The cumulative response time was recorded as an indirect indicator of the cognitive load or listening effort in each condition. The correlations were computed between demographic/hearing factors (e.g., hearing thresholds in the non-implanted ear) and bimodal performance/benefits (where bimodal benefits refer to the performance differences between CI alone and CI+HA). Mandarin tone recognition with both CI alone and CI+HA was significantly poorer in the mixed-talker condition than in the blocked-talker condition, while vowel recognition was comparable in the two presentation conditions. Bimodal hearing significantly improved Mandarin tone recognition but not vowel recognition. Mandarin syllable recognition was significantly affected by both talker variability and bimodal hearing. The cumulative response time significantly reduced with CI+HA compared with CI alone, but remained invariant with respect to talker variability. There was no interaction between talker variability and bimodal hearing for any performance measure adopted in this study. Correlation analyses revealed that the bimodal performance and benefits in Mandarin tone, vowel, and syllable recognition could not be predicted by the hearing thresholds in the non-implanted ear or by the demographic factors of the participants. Talker variability from trial to trial significantly degraded Mandarin tone and syllable recognition performance in both the CI alone and CI+HA conditions. While bimodal hearing did not reduce the talker variability effects on Mandarin tone and syllable recognition, generally better Mandarin tone and syllable recognition performance with shorter response time (an indicator of less listening effort) was observed when a contralateral HA was used in conjunction with the CI. On the other hand, vowel recognition was not significantly affected by either talker variability or bimodal hearing, because ceiling effects could not be counted out of the vowel recognition results.