Segregating semantic and syntactic aspects of processing in the human brain: an fMRI investigation of different word types
Segregating semantic and syntactic aspects of processing in the human brain: an fMRI investigation of different word types
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DOI：
10.1093/cercor/10.7.698
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发表时间：
2000-07-01
期刊：
影响因子：
3.7
通讯作者：
von Cramon, DY
中科院分区：
文献类型：
--
作者：
Friederici, AD;Opitz, B;von Cramon, DY
在事件相关功能磁共振成像实验中，研究了不同任务要求（语义/句法任务）条件下，不同语义（具体/抽象词）和句法（内容/功能词）状态的单个词的加工。任务需求在很大程度上决定了支持文字处理的神经元网络的哪些子部分被激活。语义任务要求选择性激活额下回左侧三角部（BA 45）和左侧颞中回/上级后部（BA 21/22/37）。与此相反，句法处理的要求，导致激活的左额鳃盖（BA 44）和皮层内衬的交界处的下额和下中央前沟（BA 44/6）的下尖端增加。此外，对于后者的领域，一个词类的具体互动时，观察到的句法判断是必需的。这种交互作用可以被解释为一种典型性效应：一个词类的非典型成员，即具体功能词和抽象内容词，比典型成员，即抽象功能词和具体内容词表现出更大的激活。合并后的数据表明，激活模式的字处理预测的句法类，也不是语义的具体性，而是由任务的需求集中在语义或句法方面。因此，我们的研究结果，语义和句法方面的处理功能不同，涉及不同的子部分的神经网络的文字处理支持特定领域的组织的语言系统。
The processing of single words that varied in their semantic (concrete/abstract word) and syntactic (content/function word) status was investigated under different task demands (semantic/ syntactic task) in an event-related functional magnetic resonance imaging experiment. Task demands to a large degree determined which subparts of the neuronal network supporting word processing were activated. Semantic task demands selectively activated the left pars triangularis of the inferior frontal gyrus (BA 45) and the posterior part of the left middle/superior temporal gyrus (BA 21/22/37). In contrast, syntactic processing requirements led to an increased activation in the inferior tip of the left frontal operculum (BA 44) and the cortex lining the junction of the inferior frontal and inferior precentral sulcus (BA 44/6). Moreover, for these latter areas a word class by concreteness interaction was observed when a syntactic judgement was required. This interaction can be interpreted as a prototypicality effect: non-prototypical members of a word class, i.e. concrete function words and abstract content words, showed a larger activation than prototypical members, i.e. abstract function words and concrete content words. The combined data suggest that the activation pattern underlying word processing is predicted neither by syntactic class nor semantic concreteness but, rather, by task demands focusing either on semantic or syntactic aspects. Thus, our findings that semantic and syntactic aspects of processing are both functionally distinct and involve different subparts of the neuronal network underlying word processing support a domain-specific organization of the language system.