The influence of context on hemispheric recruitment during metaphor processing.
The influence of context on hemispheric recruitment during metaphor processing.
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DOI：
10.1162/jocn_a_00053
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发表时间：
2011-11
影响因子：
3.2
通讯作者：
Hogstrom LJ
中科院分区：
文献类型：
--
作者：
Diaz MT;Hogstrom LJ
虽然左半球在语言中的突出地位已经得到了很好的确立，但对右半球可能发挥的作用的强调较少。行为、病人和神经影像学研究表明，右半球可能参与处理比喻语言。此外，研究表明，语境可以修改语言过程，促进理解。在这里，我们研究了比喻性和上下文如何影响大脑激活，特别是对右半球功能的兴趣。本实验室先前的工作表明，新刺激会使右额下回参与，新隐喻和熟悉隐喻都会使右额下回和右颞极参与。等级显著性假说（GSH）认为，语境可以减少整合需求，增加隐喻的显著性，从而减少右半球对隐喻的招募。在本研究中，功能磁共振成像被用来调查大脑功能，而参与者阅读的字面和隐喻的句子，前面是一个一致或不一致的字面句子。与先前的研究一致，所有句子都涉及传统的左半球区域。隐喻和字面句子之间的差异被观察到，但只在左半球。相反，一致性的主要影响被发现在右额下回，右颞极，背内侧前额叶皮层。部分与GSH一致，我们的研究结果突出了强大的影响，语境对语言，展示了右半球在话语中的重要性，并建议，在更广泛的话语语境一致性有更大的影响右半球招聘比比喻。
Although the left hemisphere's prominence in language is well established, less emphasis has been placed on possible roles for the right hemisphere. Behavioral, patient, and neuroimaging research suggests that the right hemisphere may be involved in processing figurative language. Additionally, research has demonstrated that context can modify language processes and facilitate comprehension. Here we investigated how figurativeness and context influenced brain activation, with a specific interest in right hemisphere function. Previous work in our lab indicated that novel stimuli engaged right inferior frontal gyrus and that both novel and familiar metaphors engaged right inferior frontal gyrus and right temporal pole. The Graded Salience Hypothesis (GSH) proposes that context may lessen integration demands, increase the salience of metaphors, and thereby reduce right hemisphere recruitment for metaphors. In the present study, functional Magnetic Resonance Imaging was used to investigate brain function while participants read literal and metaphoric sentences that were preceded by either a congruent or an incongruent literal sentence. Consistent with prior research, all sentences engaged traditional left hemisphere regions. Differences between metaphors and literal sentences were observed, but only in the left hemisphere. In contrast, a main effect of congruence was found in right inferior frontal gyrus, right temporal pole, and dorsal medial prefrontal cortex. Partially consistent with the GSH, our results highlight the strong influence of context on language, demonstrate the importance of the right hemisphere in discourse, and suggest that in a wider discourse context congruence has a greater influence on right hemisphere recruitment than figurativeness.
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