|其他题名||An exploration of the relationship between the visual magnocellular stream and Chinese character reading|
|关键词||视觉大细胞通路 汉字阅读 空间频率 时间频率 发展性阅读障碍|
（1）成熟阅读者大细胞通路时间、空间频率敏感性均与汉字正字法技能显著相关，同时其时间分辨性还与语音意识有关。脑电研究结果显示，大细胞通路时间频率敏感条件下的P1 峰值波幅与语音意识显著相关，而空间频率敏感条件下的N1 波幅与汉字正字法密切相关，表现出两种相关模式在时间维度上的分离。
（2）汉语小学儿童大细胞通路时间、空间频率特性在行为层面上均与语音技能紧密相关；同时大细胞通路空间频率敏感性也表现出类似于成人的结果，与正字法技能显著相关。脑电结果显示，大细胞通路时间频率敏感条件下的N1 峰值波幅与语音意识显著相关，空间频率条件下的P1 波幅与正字法技能相关。
|其他摘要||Reading starts from the visual coding of printed text, and one of the visual streams for human beings is the magnocellular (M) pathway which is sensitive to visual stimuli of high temporal frequency and low spatial frequency. Previous studies (especially researches on developmental dyslexia) have found the close relationship between the visual M function and reading. However, most of previous studies were in the context of alphabetic languages. Given that the visual forms of Chinese characters are complicated, the visual analysis played an important role in Chinese reading. Accordingly, it is necessary to explore the relationship between visual M stream and Chinese character reading. To our knowledge, there have been few relevant researches in Chinese.|
The present study tried to investigate the relationship between the visual M function (respectively including the temporal and spatial function) and Chinese character reading among adults and children through the behavioral and event-related potential (ERP) techniques. Meanwhile, the present study directly manipulated the spatial frequency of Chinese characters to separate the visual M condition from the visual control condition, with adopting the global/local decision task to reflect the Chinese character recognition. A group of dyslexics with a normal M stream (M-normal DD) and a group of dyslexics with an impaired M stream (M-impaired DD) were recuited. By comparing the performance of Chinese character recognition between the two groups of dyslexics, we tried to explore how the M deficit in dyslexics affected Chinese character reading. The current results showed as below:
(1) For the adults, the temporal and spatial functions of visual M stream were both significantly correlated with orthographic skills, and the temporal resolution was also related with phonological awareness. Results of ERP data exhibited that, the P1 amplitude in the temporal condition of M stream was closely related with scores in phonological awareness test, and N1 amplitude in spatial condition of M stream was related with Chinese orthographic processing, revealing the dissociation in the time process.
(2) As to the children from primary schools, the temporal and spatial function of their visual M stream were both related with performance in phonolgical awareness test; meanwhile, the spatial-frequency sensitivity of M stream was also related with orthographic skills, similar with the adult pattern. Results of ERP data showed that, the peak amplitude of N1 component in temporal condition of visual M stream was related with phonological awareness while the P1 amplitude in spatial condition of M stream was related with Chinese orthographic skills.
(3) In the global/local decision task, M-normal DD and age-matched normal readers both showed a significant effect of global advantage in visual M condition, revealing the spatial-frequency sensitivity might contribute to the global recognition of Chinese characters; however, the global precedence effect was absent in M-impaired DD.
The present findings revealed that, although the adults and children showed similar patterns of the relationship between the visual M function and Chinese character reading, the visual M function tended to relate with Chinese phonology for children while M function was more closely related with orthographic skills for adults. This difference between adults and children might reflect a transfer from the reliance on phonological strategy to focusing on the orthographic processing during the reading acquistion of Chinese. Meanwhile, based on the comparison of the Chinese character recognition between M-normal and M-impaired DDs, it could be supposed that the M deficits in Chinese dyslexic childen might negatively affect their global recognition of Chinese characters, which might further impede the reading procedure.
|赵婧. 视觉大细胞通路与汉字阅读的关系探究[D]. 北京. 中国科学院研究生院,2014.|
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