Effects of reverberation on brainstem representation of speech in musicians and non-musicians.
Effects of reverberation on brainstem representation of speech in musicians and non-musicians.
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DOI：
10.1016/j.brainres.2010.07.100
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发表时间：
2010-10-08
期刊：
影响因子：
2.9
通讯作者：
Krishnan A
中科院分区：
文献类型：
--
作者：
Bidelman GM;Krishnan A
音乐家语言处理的知觉和神经生理学增强表明，特定领域的经验可能会增强为特定语言行为招募的神经资源。在日常生活中，听众面临着在退化的收听条件下提取语音信号的问题。在这里，我们研究是否音乐训练提供弹性的混响对皮质下表示的音高和共振峰相关的语音谐波信息的退化影响。脑干频率跟随反应（FFR）记录从音乐家和非音乐家控制响应元音/i/在四个不同水平的混响和分析的基础上，他们的频谱-时间组成。对于这两组，混响对音高的神经编码几乎没有影响，但显著降低了共振峰相关谐波的神经编码（即，元音质量），这表明对语音的源滤波器分量的不同影响。然而，在安静和几乎所有的混响条件下，音乐家比非音乐家表现出更强大的反应。通过比较脑干频谱幅度与基本（F0）和第一共振峰（F1）频率差阈值（DLs）的感知测量，证实了神经生理学结果。对于这两种类型的歧视，音乐家获得的DL比非音乐家好2-4倍。结果表明，音乐家的增强的神经编码的声学功能，经验依赖的效果，是更耐混响退化，这可以解释他们的增强感知能力的行为相关的语音和/或音乐任务在不利的听力条件。
Perceptual and neurophysiological enhancements in linguistic processing in musicians suggest that domain specific experience may enhance neural resources recruited for language specific behaviors. In everyday situations, listeners are faced with extracting speech signals in degraded listening conditions. Here, we examine whether musical training provides resilience to the degradative effects of reverberation on subcortical representations of pitch and formant-related harmonic information of speech. Brainstem frequency-following responses (FFRs) were recorded from musicians and non-musician controls in response to the vowel /i/ in four different levels of reverberation and analyzed based on their spectro-temporal composition. For both groups, reverberation had little effect on the neural encoding of pitch but significantly degraded neural encoding of formant-related harmonics (i.e., vowel quality) suggesting a differential impact on the source-filter components of speech. However, in quiet and across nearly all reverberation conditions, musicians showed more robust responses than non-musicians. Neurophysiologic results were confirmed behaviorally by comparing brainstem spectral magnitudes with perceptual measures of fundamental (F0) and first formant (F1) frequency difference limens (DLs). For both types of discrimination, musicians obtained DLs which were 2–4 times better than non-musicians. Results suggest that musicians’ enhanced neural encoding of acoustic features, an experience-dependent effect, is more resistant to reverberation degradation which may explain their enhanced perceptual ability on behaviorally relevant speech and/or music tasks in adverse listening conditions.
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影响因子：
3.2
作者：
Bidelman, Gavin M.;Gandour, Jackson T.;Krishnan, Ananthanarayan
通讯作者：
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