Semantic versus perceptual interactions in neural processing of speech-in-noise
Semantic versus perceptual interactions in neural processing of speech-in-noise
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DOI：
10.1016/j.neuroimage.2013.04.049
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发表时间：
2013-10-01
期刊：
影响因子：
5.7
通讯作者：
Scott, Sophie K.
中科院分区：
文献类型：
--
作者：
Golestani, Narly;Hervais-Adelman, Alexis;Scott, Sophie K.
母语听者在感知噪音语音的过程中使用更高层次的、语境驱动的语义和语言信息。在最近的一项行为研究中，我们使用了一种新的范例，通过使用单词来隔离语音的语义水平，我们发现这种母语优势至少部分是由语义上下文驱动的（Golestani et al., 2009）。在这里，我们使用相同的范式在功能磁共振成像（fMRI）实验中研究语音可理解性的神经基础，以及母语中这种语义语境效应的神经基础。对两个听觉呈现的语义相关或不相关的单词中的第一个进行强制选择识别任务，其中第一个“目标”单词被嵌入不同的噪音水平。结果表明，大脑语言网络的部分，包括布洛卡区和左侧颞后上沟，以及已知的与注意力和任务难度相关的大脑区域的激活，受到刺激可理解性的调节。根据之前的一些研究，我们在句子水平上考察了语言语境在退化言语可理解性中的作用，我们发现，左侧顶叶下皮层角回的激活受到语义语境的调节，而且这种调节依赖于言语刺激的可理解性。我们的研究结果有助于进一步阐明上下文驱动和信号驱动因素在语音退化感知过程中相互作用的神经机制，特别是在语义层面。(c) 2013爱思唯尔公司版权所有。
Native listeners make use of higher-level, context-driven semantic and linguistic information during the perception of speech-in-noise. In a recent behavioral study, using a new paradigm that isolated the semantic level of speech by using words, we showed that this native-language benefit is at least partly driven by semantic context (Golestani et al., 2009). Here, we used the same paradigm in a functional magnetic resonance imaging (fMRI) experiment to study the neural bases of speech intelligibility, as well as to study the neural bases of this semantic context effect in the native language. A forced-choice recognition task on the first of two auditorily presented semantically related or unrelated words was employed, where the first, 'target' word was embedded in different noise levels. Results showed that activation in components of the brain language network, including Broca's area and the left posterior superior temporal sulcus, as well as brain regions known to be functionally related to attention and task difficulty, was modulated by stimulus intelligibility. In line with several previous studies examining the role of linguistic context in the intelligibility of degraded speech at the sentence level, we found that activation in the angular gyrus of the left inferior parietal cortex was modulated by the presence of semantic context, and further, that this modulation depended on the intelligibility of the speech stimuli. Our findings help to further elucidate neural mechanisms underlying the interaction of context-driven and signal-driven factors during the perception of degraded speech, and this specifically at the semantic level. (c) 2013 Elsevier Inc. All rights reserved.