Abstract
With regard to brain language processing, the activation patterns have been well studied, and recently there are great interest in the connectivity models. The crucial brain areas for phonological processing involves left inferior frontal gyrus (LIFG), left inferior parietal lobule (LIPL) and left posterior middle temporal gyrus (LpMTG). Specially in Chinese processing, the left middle frontal gyrus (LMFG) is considered as an essential region. However, the connectivity pattern among these brain areas is not well understood. In this study, a rhyming experiment of Chinese was conducted, and the Dynamic causal modeling (DCM) and the Bayesian model selection (BMS) were used to examine the interaction between brain regions and choose the best model for rhyming task of Chinese. By examining the interactions, it was found that LMFG exerted inhibitory modulation on LIPL and LIFG; the phonological processing enhanced the connection from LIPL to LIFG and LMFG, which suggested the important roles of these connections for the increased phonological load; And LpMTG modulated LIFG and LMFG negatively, and LIPL positively under rhyming judgment task.
Highlights
Different language processing models have been put forth to describe the time-course of reading in alphabetic language [1, 2]
Tan et al [8]conducted a metaanalysis to examine phonological processing of written word forms in Chinese and English and found both Chinese and English phonological processing involved in activation in left parietal lobule (LIPL), left inferior frontal gyrus (LIFG) and bilateral occipitotemporal regions; and the left middle frontal gyrus (LMFG) was proposed to play an crucial role in the Chinese processing
Previous neuroimaging studies have established the connectivity analysis in alphabetic language, and showed that the areas involved in phonological processing were modulated by each other [50,51,52]
Summary
Different language processing models have been put forth to describe the time-course of reading in alphabetic language [1, 2]. The most popular language processing model is the dualroute model [3,4,5,6]. Chinese, as a logographic language with single syllable per character, is different from alphabetic language such as English in various aspects. The brain mechanism of Chinese understanding differs from alphabetic language [7, 8]. When reading printed Chinese, the functional connectivity in the brain may differ from reading written
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