Cortical Neural Activity Underlying Speech Perception in Postlingual Adult Cochlear Implant Recipients
Cortical Neural Activity Underlying Speech Perception in Postlingual Adult Cochlear Implant Recipients
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DOI：
10.1159/000153434
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发表时间：
2009-01-01
影响因子：
1.6
通讯作者：
Kishon-Rabin, Liat
中科院分区：
文献类型：
--
作者：
Henkin, Yael;Tetin-Schneider, Simona;Kishon-Rabin, Liat
听觉事件相关电位（AERPs）和同时获得的行为措施（性能的准确性和反应时间）被用来研究语言后成人人工耳蜗植入（CI）收件人和正常听力（NH）的控制言语知觉。当受试者执行古怪的辨别任务时，记录AERPs，增加声学语音需求。这些任务由成对的自然音节组成，这些音节的不同之处在于以下语音对比：元音位置，发声，元音高度和发音位置。结果表明，P3电位是可比的CI收件人和NH控制时，声学线索的感知语音对比是可访问的。随着基本的时间和/或频谱线索的可访问性的减少，CI收件人表现出延迟（延长P3潜伏期）和同步（幅度降低）中央语音声音处理相比，NH控制。在本研究中使用的语音对比中，发音对比的位置产生了（1）CI接受者和NH控制者在所有测量中最显著的差异，以及（2）语音辨别的神经生理表现（即P3潜伏期）和知觉信息的有意识整合（即表现准确性和反应时间）之间的显著相关性。因此，P3暴露的困难施加在受损的听觉系统的CI收件人，特别是当引起的语音对比，需要处理的简短的时间频谱线索。这些研究结果支持P3电位作为皮层处理的敏感神经指标，可以提供关于CI接受者中不同声学-语音线索的可访问性和神经编码的信息。版权所有（C）2008 S. Karger AG，巴塞尔
Auditory event-related potentials (AERPs) and the simultaneously obtained behavioral measures (performance accuracy and reaction time) were used to study speech perception in postlingual adult cochlear implant (CI) recipients and in normal-hearing (NH) controls. AERPs were recorded while subjects were performing oddball discrimination tasks with increasing acoustic-phonetic demand. The tasks consisted of pairs of natural syllables that differed by one of the following phonetic contrasts: vowel place, voicing, vowel height, and place of articulation. Results indicated that the P3 potential was comparable in CI recipients and NH controls when the acoustic cues to the perception of the phonetic contrast were accessible. With the reduction in accessibility to the essential temporal and/or spectral cues, CI recipients exhibited delayed (prolonged P3 latency) and less synchronous (reduced amplitude) central speech-sound processing compared to NH controls. Among the phonetic contrasts used in the present study the place of articulation contrast yielded (1) the most prominent differences between CI recipients and NH controls across all measures, and (2) significant correlations between the neurophysiologic manifestation of speech discrimination (i.e. P3 latency), and conscious integration of perceptual information (i.e. performance accuracy and reaction time). Thus, P3 exposed the difficulties imposed on the impaired auditory system of CI recipients especially when elicited by speech contrasts that required processing of brief temporal-spectral cues. These findings support the P3 potential as a sensitive neural index of cortical processing that may provide information regarding accessibility and neural encoding of distinct acoustic-phonetic cues in CI recipients. Copyright (C) 2008 S. Karger AG, Basel