Dynamic visual perception and reading development in Chinese school children |
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Authors: | Meng Xiangzhi Cheng-Lai Alice Zeng Biao Stein John F Zhou Xiaolin |
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Institution: | (1) Department of Psychology, Peking University, Beijing, 100871, China;(2) The Joint PekingU-PolyU Center for Child Development and Learning, Peking University, Beijing, China;(3) Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hong Kong, China;(4) The Joint PekingU-PolyU Center for Child Development and Learning, Hong Kong, China;(5) University Laboratory of Physiology, Oxford University, Oxford, UK; |
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Abstract: | The development of reading skills may depend to a certain extent on the development of basic visual perception. The magnocellular
theory of developmental dyslexia assumes that deficits in the magnocellular pathway, indicated by less sensitivity in perceiving
dynamic sensory stimuli, are responsible for a proportion of reading difficulties experienced by dyslexics. Using a task that
measures coherent motion detection threshold, this study examined the relationship between dynamic visual perception and reading
development in Chinese children. Experiment 1 compared the performance of 27 dyslexics and their age- and IQ-matched controls in the coherent motion detection task and
in a static pattern perception task. Results showed that only in the former task did the dyslexics have a significantly higher
threshold than the controls, suggesting that Chinese dyslexics, like some of their Western counterparts, may have deficits
in magnocellular pathway. Experiment 2 examined whether dynamic visual processing affects specific cognitive processes in reading. One hundred fifth-grade children
were tested on visual perception and reading-related tasks. Regression analyses found that the motion detection threshold
accounted for 11% and 12%, respectively, variance in the speed of orthographic similarity judgment and in the accuracy of
picture naming after IQ and vocabulary size were controlled. The static pattern detection threshold could not account for
any variance. It is concluded that reading development in Chinese depends to a certain extent on the development of dynamic
visual perception and its underlying neural pathway and that the impact of visual development can be specifically related
to orthographic processing in reading Chinese. |
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