Cross-Frequency Integration for Consonant and Vowel Identification in Bimodal Hearing
Cross-Frequency Integration for Consonant and Vowel Identification in Bimodal Hearing
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DOI：
10.1044/1092-4388(2010/10-0197
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发表时间：
2011-06-01
影响因子：
2.6
通讯作者：
Braida, Louis D.
中科院分区：
文献类型：
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作者：
Kong, Ying-Yee;Braida, Louis D.
目的：当听者整合来自声学和电听觉的语音提示时，双耳组合声电刺激（也称为双峰听觉）中的改进的语音识别可以出现。本研究的目的是（a）识别在低频区的电听觉和残余声听觉中提取的言语线索和（B）调查人工耳蜗（CI）使用者整合跨频率言语线索的能力。方法：听力正常（NH）和CI受试者参加辅音和元音识别任务。每个受试者在3种听力条件下进行测试：单独CI（NH的声码器语音），单独助听器（HA）（NH的低通滤波语音），以及两者。采用最优整合模型PreLabeling integration model（Braida，1991）评价每个受试者的整合能力。结果：只有少数CI受试者在安静环境中表现出双峰优势。从CI和HA中提取的语音线索对于辅音是高度冗余的，但对于元音是互补的。CI的听众也表现出降低整合能力的辅音和元音identification相比，他们的NH people.Conclusion：这些研究结果表明，减少双峰效益CI的听众是由于不足的互补语音线索在耳朵，整合能力下降，或两者兼而有之。
Purpose: Improved speech recognition in binaurally combined acoustic-electric stimulation (otherwise known as bimodal hearing) could arise when listeners integrate speech cues from the acoustic and electric hearing. The aims of this study were (a) to identify speech cues extracted in electric hearing and residual acoustic hearing in the low-frequency region and (b) to investigate cochlear implant (CI) users' ability to integrate speech cues across frequencies.Method: Normal-hearing (NH) and CI subjects participated in consonant and vowel identification tasks. Each subject was tested in 3 listening conditions: CI alone (vocoder speech for NH), hearing aid (HA) alone (low-pass filtered speech for NH), and both. Integration ability for each subject was evaluated using a model of optimal integration-the PreLabeling integration model (Braida, 1991).Results: Only a few CI listeners demonstrated bimodal benefit for phoneme identification in quiet. Speech cues extracted from the CI and the HA were highly redundant for consonants but were complementary for vowels. CI listeners also exhibited reduced integration ability for both consonant and vowel identification compared with their NH counterparts.Conclusion: These findings suggest that reduced bimodal benefits in CI listeners are due to insufficient complementary speech cues across ears, a decrease in integration ability, or both.