Hemispheric roles in the perception of speech prosody
Hemispheric roles in the perception of speech prosody
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DOI：
10.1016/j.neuroimage.2004.06.004
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发表时间：
2004-09-01
期刊：
影响因子：
5.7
通讯作者：
Lowe, M
中科院分区：
文献类型：
--
作者：
Gandour, J;Tong, YX;Lowe, M
语音韵律既不是在单个区域也不是在特定的半球进行处理，而是涉及多个区域，包括两个半球的大规模空间分布网络。半球偏侧化是否基于较高级别的韵律表示或较低级别的声学线索编码，或两者兼而有之，仍有待阐明。进行了一项跨语言（中文；英文）功能磁共振成像研究，以检查在快速反应、辨别范式中选择性注意三音节（I3，T3）和单音节（I1，T1）话语对中呈现的中文语调（I）和声调（T）所引发的大脑活动。中国组在左下顶叶区域在任务（I1、I3、T1、T3）中表现出比英国组更大的活动。只有中国组的下顶叶和后上颞区（I1、I3、T1、T3）、前颞区（I1、I3、T1、T3）和额极区（I1、I3）表现出向左不对称。无论韵律单位或时间间隔如何，两种语言群体的颞上沟和额中回中部均存在向右不对称性。半球偏侧效应使我们能够区分中国群体中与高阶韵律表征相关的大脑活动和与听众之间共享的低级声学/听觉过程相关的活动，无论语言经验如何。偏侧化受到语言经验的影响，语言经验塑造了外部听觉信号的内部韵律表征。我们认为，语音韵律感知主要由 RH 介导，但当需要对复杂声音进行听觉分析之外的语言处理时，则左偏化到任务相关区域。 (C) 2004 Elsevier Inc. 保留所有权利。
Speech prosody is processed in neither a single region nor a specific hemisphere, but engages multiple areas comprising a large-scale spatially distributed network in both hemispheres. It remains to be elucidated whether hemispheric lateralization is based on higher-level prosodic representations or lower-level encoding of acoustic cues, or both. A cross-language (Chinese; English) fMRI study was conducted to examine brain activity elicited by selective attention to Chinese intonation (I) and tone (T) presented in three-syllable (I3, T3) and one-syllable (I1, T1) utterance pairs in a speeded response, discrimination paradigm. The Chinese group exhibited greater activity than the English in a left inferior parietal region across tasks (I1, I3, T1, T3). Only the Chinese group exhibited a leftward asymmetry in inferior parietal and posterior superior temporal (I1, I3, T1, T3), anterior temporal (I1, I3, T1, T3), and frontopolar (I1, I3) regions. Both language groups shared a rightward asymmetry in the mid portions of the superior temporal sulcus and middle frontal gyrus irrespective of prosodic unit or temporal interval. Hemispheric laterality effects enable us to distinguish brain activity associated with higher-order prosodic representations in the Chinese group from that associated with lower-level acoustic/auditory processes that are shared among listeners regardless of language experience. Lateralization is influenced by language experience that shapes the internal prosodic representation of an external auditory signal. We propose that speech prosody perception is mediated primarily by the RH, but is left-lateralized to task-dependent regions when language processing is required beyond the auditory analysis of the complex sound. (C) 2004 Elsevier Inc. All rights reserved.