From letters to composed concepts: A magnetoencephalography study of reading,Human Brain Mapping

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From letters to composed concepts: A magnetoencephalography study of reading
Human Brain Mapping ( IF 3.5 ) Pub Date : 2021-08-17 , DOI: 10.1002/hbm.25608
Graham Flick _{1,

2} , Osama Abdullah ₂ , Liina Pylkkänen _{1,

2,

3}

Affiliation

Language comprehension requires the recognition of individual words and the combination of their meanings to yield complex concepts or interpretations. This combinatory process often requires the insertion of unstated semantic material between words, based on thematic or feature knowledge. For example, the phrase horse barn is not interpreted as a blend of a horse and a barn, but specifically a barn where horses are kept. Previous neuroscientific evidence suggests that left posterior and anterior temporal cortex underpin thematic and feature-based concept knowledge, respectively, but much remains unclear about how these areas contribute to combinatory language processing. Using magnetoencephalography, we contrasted source-localized responses to modifier-noun phrases involving thematic relations versus feature modifications, while also examining how lower-level orthographic processing fed composition. Participants completed three procedures examining responses to letter-strings, adjective-noun phrases, and noun–noun combinations that varied the semantic relations between words. We found that sections of the left anterior temporal lobe, posterior temporal lobe, and cortex surrounding the angular gyrus were all engaged in the minimal composition of adjective-noun phrases, a more distributed network than in most prior studies of minimal composition. Of these regions, only the left posterior temporal lobe was additionally sensitive to implicit thematic relations between composing words, suggesting that it houses a specialized relational processing component in a wider composition network. We additionally identified a left occipitotemporal progression from orthographic to lexical processing, feeding ventral anterior areas engaged in the combination of word meanings. Finally, by examining source signal leakage, we characterized the degree to which these responses could be distinguished from one another using source estimation.

中文翻译：

从字母到组合概念：阅读的脑磁图研究

语言理解需要识别单个单词并将它们的含义组合起来以产生复杂的概念或解释。这种组合过程通常需要基于主题或特征知识在单词之间插入未说明的语义材料。例如，短语horse barn不被解释为马和谷仓的混合体，而是专门用来饲养马匹的谷仓。先前的神经科学证据表明，左后颞叶皮层和前颞叶皮层分别支持主题和基于特征的概念知识，但这些区域如何促进组合语言处理仍不清楚。使用脑磁图，我们对比了源本地化对涉及主题关系和特征修饰的修饰名词短语的反应，同时还研究了较低级别的正字法处理如何提供成分。参与者完成了三个程序，检查了对字母串、形容词-名词短语和名词-名词组合的反应，这些反应改变了单词之间的语义关系。我们发现左前颞叶、后颞叶、角回周围的皮层和皮层都参与了形容词-名词短语的最小组合，这是一个比大多数先前的最小组合研究更分散的网络。在这些区域中，只有左后颞叶对组成词之间的隐含主题关系额外敏感，这表明它在更广泛的组成网络中包含一个专门的关系处理组件。我们还确定了从正字法到词汇处理的左枕颞进展，为参与词义组合的腹前区提供食物。最后，通过检查源信号泄漏，我们描述了使用源估计可以区分这些响应的程度。

更新日期：2021-09-19

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