Functional and anatomical dissociation between the orthographic lexicon and the orthographic buffer revealed in reading and writing Chinese characters by fMRI

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Title:	Functional and anatomical dissociation between the orthographic lexicon and the orthographic buffer revealed in reading and writing Chinese characters by fMRI
Authors:	吳嫻;Chen, Hsiang-Yu;Chang, Erik C.;Chen, Sinead H.Y.;Lin, Yi-Chen;Wu, Denise H.
Contributors:	生醫理工學院認知神經科學研究所
Keywords:	Adult;Asian Continental Ancestry Group;Brain;Brain - physiology;Brain Mapping;Character frequency;Character recognition;Character stroke number;Female;Humans;Language;Magnetic Resonance Imaging;Male;Mental writing;Nerve Net - physiology;Neuroimaging;Orthography;Pattern Recognition, Visual - physiology;Reading;Stroke;Writing;Written production;Young Adult
Date:	2016-04-01
Issue Date:	2026-04-23 14:26:52 (UTC+8)
Publisher:	United States: Elsevier Inc
Abstract:	摘要： The contribution of orthographic representations to reading and writing has been intensively investigated in the literature. However, the distinction between neuronal correlates of the orthographic lexicon and the orthographic (graphemic) buffer has rarely been examined in alphabetic languages and never been explored in non-alphabetic languages. To determine whether the neural networks associated with the orthographic lexicon and buffer of logographic materials are comparable to those reported in the literature, the present fMRI experiment manipulated frequency and the stroke number of Chinese characters in the tasks of form judgment and stroke judgment, which emphasized the processing of character recognition and writing, respectively. It was found that the left fusiform gyrus exhibited higher activation when encountering low-frequency than high-frequency characters in both tasks, which suggested this region to be the locus of the orthographic lexicon that represents the knowledge of character forms. On the other hand, the activations in the posterior part of the left middle frontal gyrus and in the left angular gyrus were parametrically modulated by the stroke number of target characters only in the stroke judgment task, which suggested these regions to be the locus of the orthographic buffer that represents the processing of stroke sequence in writing. These results provide the first evidence for the functional and anatomical dissociation between the orthographic lexicon and buffer in reading and writing Chinese characters. They also demonstrate the critical roles of the left fusiform area and the frontoparietal network to the long-term and short-term representations of orthographic knowledge, respectively, across different orthographies. •We studied orthographic lexicon and buffer for Chinese reading and writing by fMRI.•Orthographic lexicon and buffer are functionally and anatomically dissociable.•Orthographic lexicon in left fusiform gyrus was sensitive to character frequency.•Orthographic buffer in LMFG and left angular gyrus was sensitive to stroke numbers.•Orthographic processes reflect form difference of logographic and alphabetic words. 其他題名： Neuroimage 出版者： United States: Elsevier Inc 出版日期： 2016-04-01 出處： NeuroImage, 2016-04, Vol.129, p.105-116 版權： 2016 Elsevier Inc. 版權： Copyright © 2016 Elsevier Inc. All rights reserved. 版權： Copyright Elsevier Limited Apr 1, 2016 識別號： ISSN: 1053-8119 識別號： ISSN: 1095-9572 識別號： EISSN: 1095-9572 識別號： DOI: 10.1016/j.neuroimage.2016.01.009 識別號： PMID: 26777478
Appears in Collections:	[College of Science Institute of Cognitive Neuroscience] journal & Dissertation

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