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Eye-movement study during visual search in Chinese children with developmental dyslexia

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文摘 Background Developmental dyslexia (DD) is a disorder in which children with normal intelligence and sensory abilities show learning deficits in reading. Abnormal eye movements have been found in DD. However, eye-movement abnormalities during visual search among Chinese children with DD remain unknown. We aimed to identify the eye-movement characteristics and search efficiency of Chinese children with DD during visual search for targets of different conceptual categories, under same-category conditions. Methods We compared 32 Chinese dyslexic children and 39 non-dyslexic children in visual search tasks, which were assessed using EyeLink II High-Speed Eye Tracker (SR Research Ltd., Canada). Letters, single Chinese characters, digits, Chinese phrases, figures and facial expressions were used as stimuli. Targets were similar to distractors in meaning, phonology and/or shape. Results A main effect of task on visual search scores and all eye-movement parameters were found. Search scores, average saccade amplitude and saccade distance were significantly smaller in the DD group than in the controls. An interaction between group and task was found for pupil diameter. Conclusions Unlike normal readers, children with DD had a reduction in the visual attention span and search accuracy. Besides, children with DD could not increase their mental workload with increase in task difficulty. The conceptual category of the stimulus materials significantly impacts search speed, accuracy and eye-movement parameters.
来源 Chinese Medical Journal ,2013,126(22):4306-4311 【核心库】
DOI 10.3760/cma.j.issn.0366-6999.20123067
关键词 children ; developmental dyslexia ; eye movement ; visual search
地址

1. Faculty of Maternal and Child Health, Preventive Medicine Institute, School of Public Health, Sun Yat-sen University, Guangdong, Guangzhou, 510080  

2. Faculty of Maternal and Child Health, Preventive Medicine Institute, School of Public Health, Sun Yat-sen University, Key Laboratory of Mental Health and Cognitive Science of Guangdong Province, Guangdong, Guangzhou, 510080  

3. South China Normal University, Key Laboratory of Mental Health and Cognitive Science of Guangdong Province, Guangdong, Guangzhou, 510631

语种 英文
文献类型 研究性论文
ISSN 0366-6999
学科 医药、卫生
基金 supported by the grants from the National Natural Science Foundation of China ;  the Guangdong Natural Science Fundation ;  国家教育部高等学校博士学科点专项科研基金
文献收藏号 CSCD:4983978

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