Separable effects of semantic priming and imageability on word processing in human cortex
Separable effects of semantic priming and imageability on word processing in human cortex
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DOI：
10.1093/cercor/bhh014
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发表时间：
2004-05-01
期刊：
影响因子：
3.7
通讯作者：
Swaab, TY
中科院分区：
文献类型：
--
作者：
Giesbrecht, B;Camblin, CC;Swaab, TY
理解语义概念的神经表征是理解人类知识和经验的核心。相互竞争的认知理论认为，这些神经表征要么基于单一的语义代码，要么基于多个语义代码。我们对比这些理论使用事件相关的功能磁共振成像的语义启动研究。成对的话，无论是语义相关或不相关的，无论是高或低的成像。单一的观点预测，当呈现在相关的上下文中时，高和低可成像的单词引起的神经活动之间应该有很小的差异或没有差异，但是当存在不相关的上下文时，神经活动会有很大的差异。与此相反，这种观点，我们提供的证据，在人类皮层的上下文和imageconstriction功能和解剖分离的影响，这表明语义知识由多个代表性的代码。
Understanding the neural representation of semantic concepts is at the core of understanding human knowledge and experience. Competing cognitive theories suggest that these neural representations are based on either a unitary semantic code or on multiple semantic codes. We contrasted these theories using event-related fMRI in a semantic priming study. Pairs of words were presented that were either semantically related or unrelated and were either high or low imageable. The unitary view predicts that there should be little or no difference between neural activity evoked by high and low imageable words when presented in a related context, but large differences in neural activity when there is an unrelated context. In contrast to this view, we provide evidence for functionally and anatomically separable effects of context and imageability in human cortex, suggesting that semantic knowledge consists of multiple representational codes.