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Inter- and Intrahemispheric Connectivity Differences When Reading Japanese Kanji and Hiragana

机译:阅读日语汉字和平假名时半球和半球之间的连接差异

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摘要

Unlike most languages that are written using a single script Japanese uses multiple scripts including morphographic Kanji and sylla-bographic Hiragana and Katakana. Here, we used functional magnetic resonance imaging with dynamic causal modeling to investigate competing theories regarding the neural processing of Kanji and Hiragana during a visual lexical decision task. First, a bilateral model investigated interhemispheric connectivity between ventral occipito-temporal (vOT) cortex and Broca's area ("pars op-ercularis"). We found that Kanji significantly increased the connection strength from right-to-left vOT. This is interpreted in terms of increased right vOT activity for visually complex Kanji being integrated into the left (i.e. language dominant) hemisphere. Secondly, we used a unilateral left hemisphere model to test whether Kanji and Hiragana rely preferentially on ventral and dorsal paths, respectively, that is, they have different intrahemispheric functional connectivity profiles. Consistent with this hypothesis, we found that Kanji increased connectivity within the ventral path (V1 <-> vOT <-> Broca's area), and that Hiragana increased connectivity within the dorsal path (V1 <-> supramarginal gyms <-> Broca's area). Overall, the results illustrate how the differential processing demands of Kanji and Hiragana influence both inter- and intrahemispheric interactions.
机译:与大多数使用单个脚本编写的语言不同,日语使用多种脚本,包括形态汉字和音节平假名和片假名。在这里,我们使用具有动态因果模型的功能磁共振成像技术来研究关于视觉词汇决策任务中日文汉字和平假名神经处理的竞争性理论。首先,一个双边模型研究了腹枕颞叶(vOT)皮质与Broca区域(“ pars op-ercularis”)之间的半球间连通性。我们发现汉字从右到左vOT显着提高了连接强度。这是因为将视觉复杂的汉字整合到左半球(即语言主导)的半球中,右vOT活动增加。其次,我们使用单边左半球模型来测试汉字和平假名是否分别分别依赖于腹侧和背侧路径,即它们具有不同的半球内功能连接性。与此假设相符,我们发现汉字增加了腹侧路径(V1 <-> vOT <-> Broca区域)内的连通性,而平假名增加了背侧路径(V1 <->上腹部健身房<-> Broca区域)内的连通性。总体而言,结果说明了汉字和平假名的差分处理需求如何影响半球间和半球内相互作用。

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