Idiom comprehension: A prefrontal task?

被引:96
作者
Lauro, Leonor J. Romero
Tettamanti, Marco
Cappa, Stefano F.
Papagno, Costanza
机构
[1] Univ Milan Biccoca, Dipartimento Psicol, I-20126 Milan, Italy
[2] Univ Vita Salute San Raffaele, Ist Nazl Neuorsci, S Raffaele Sci Inst, CNR,IBFM,CERMAC, Milan, Italy
关键词
anterior prefrontal cortex; idiom comprehension; RH hypothesis;
D O I
10.1093/cercor/bhm042
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
We investigated the neural correlates of idiomatic sentence processing using event-related functional magnetic resonance imaging. Twenty-two healthy subjects were presented with 62 literal sentences and 62 idiomatic sentences, each followed by a picture and were required to judge whether the sentence matched the picture or not. A common network of cortical activity was engaged by both conditions, with the nonliteral task eliciting overall greater activation, both in terms of magnitude and spatial extent. The network that was specifically activated by the nonliteral condition involved the left temporal cortex, the left superior medial frontal gyrus (Brodmann area 9), and the left inferior frontal gyrus (IFG). Activations were also present in the right superior and middle temporal gyri and temporal pole and in the right IFG. In contrast, literal sentences selectively activated the left inferior parietal lobule and the right supramarginal gyrus. An analysis of effective connectivity indicated that the medial prefrontal area significantly increased the connection between frontotemporal areas bilaterally during idiomatic processing. Overall, the present findings indicate a crucial role of the prefrontal cortex in idiom comprehension, which could reflect the selection between alternative sentence meanings.
引用
收藏
页码:162 / 170
页数:9
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