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首页> 外文期刊>Neuropsychologia >Distinguishable neural correlates of verbs and nouns: A MEG study on homonyms
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Distinguishable neural correlates of verbs and nouns: A MEG study on homonyms

机译：动词和名词的可分辨神经相关：MEG对同音异义词的研究

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The dissociability of nouns and verbs and of their morphosyntactic operations has been firmly established by lesion data. However, the hypothesis that they are processed by distinct neural substrates is inconsistently supported by neuroimaging studies. We tackled this issue in a silent reading experiment during MEG. Participants Silently read noun/verb homonyms in minimal syntactic context: article-noun (NPs), pronoun-verb (VPs) (e.g., ii ballo/i balli, the dance/the dances; io ballo/tu bath, I dance/you dance). Homonyms allow to rule out prelexical or postlexical nuisance factors they are orthographically and phonologically identical, but serve different grammatical functions depending on context. Under these experimental conditions, different activity to nouns and verbs can be confidently attributed to representational/processing distinctions. At the sensor level, three components of event-related magnetic fields were observed for the function word and four for the content word, but Global Field Power (GFP) analysis only showed differences between VPs and NPs at several but very short time windows. By contrast, source level analysis based on Minimum Norm Estimates (MNE) yielded significantly greater activity for VPs in left frontal areas and in a left frontoparietal network at late time windows (380-397 and 393-409 ms). These results are fully consistent with lesion data, and show that verbs and nouns are processed differently in the brain. Frontal and parietal activation to verbs might correspond to morphosyntactic processes and to working memory recruitment (or thematic role assignment), respectively. Findings are consistent with the view that nouns and verbs and their morphosyntactic operations involve at least partially distinct neural substrates. However, they do not entirely rule out that nouns and verbs are processed in a shared neural substrate, and that differences result from greater complexity of verbal morphosyntax. (C) 2013 Elsevier Ltd. All rights reserved.
机译：病灶数据已牢固地确立了名词和动词及其形态句法操作的可分离性。但是，神经影像学研究并不一致地支持它们由不同的神经基质处理的假说。我们在MEG期间的无声阅读实验中解决了这个问题。参与者在最小句法环境中静默阅读名词/动词同音词：冠词（NPs），代词-动词（VPs）（例如ii ballo / i balli，舞曲/舞蹈; io ballo / tu bath，I dance / you舞蹈）。同音异义词可以排除词首或词尾上的令人讨厌的因素，它们在字法和音系上是相同的，但根据上下文而具有不同的语法功能。在这些实验条件下，与名词和动词不同的活动可以确信地归因于表征/处理上的区别。在传感器级别，功能词观察到与事件相关的磁场的三个分量，内容词观察到四个分量，但是全局场功率（GFP）分析仅显示了在几个但很短的时间窗口内VP和NP之间的差异。相比之下，基于最小范数估计（MNE）的源级别分析在较晚的时间窗口（380-397和393-409 ms）产生了左额叶区域和左额顶网中VP的明显更大的活动。这些结果与病变数据完全一致，表明动词和名词在大脑中的处理方式不同。动词的额叶和顶叶激活可能分别对应于词素句法过程和工作记忆募集（或主题角色分配）。这些发现与名词和动词及其词法操作涉及至少部分不同的神经底物的观点是一致的。但是，他们并没有完全排除名词和动词是在共享的神经底物中处理的，并且差异是由于言语词形语法的复杂性导致的。 （C）2013 Elsevier Ltd.保留所有权利。

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