静息态下汉字视觉加工脑网络的有效连接度研究

doi:10.3969/j.issn.1001-2400.2011.06.010

Abstract

Abstract:

Neuroimaging studies have revealed that several brain regions play an important role in the visual processing of Chinese characters, including the left parts of inferior occipital gyrus, middle fusiform gyrus, superior parietal lobule, and middle frontal gyrus. In order to investigate the intercommunicating pattern among these brain regions in the resting state, the method of the multivariate Granger Causality Model (GCM) is employed to analyze the time series of these brain regions, which could provide robustness to false causality in case of variables with a common source. The results demonstrate that there are significantly bidirectional Granger causality connections between the left inferior occipital gyrus and superior parietal lobule, as well as between the left middle fusiform gyrus and superior parietal lobule; the left inferior occipital gyrus Granger-causes the left middle frontal gyrus; the left middle fusiform gyrus is Granger-caused by the left middle frontal gyrus. All the results above reveal the intercommunications among the brain regions which respond to the visual processing of Chinese characters without any explicit tasks, and indicate a preparatory brain networks for the highly probable character input in the resting state.

Key words: magnetic resonance imaging, Chinese character processing, resting state, granger causality model, connectivity

CLC Number:

TP319.4

ZHAO Jizheng;ZHAO Heng;LI Jun. Effective connectivity of the Chinese character visual-processing network: a resting state research[J].J4, 2011, 38(6): 62-67.

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Effective connectivity of the Chinese character visual-processing network: a resting state research

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