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ERIC Number: EJ848484
Record Type: Journal
Publication Date: 2009-Aug
Pages: 17
Abstractor: As Provided
Reference Count: 44
ISSN: ISSN-1076-9242
Free Exploration of Painting Uncovers Particularly Loose Yoking of Saccades in Dyslexics
Kapoula, Zoi; Ganem, Rebecca; Poncet, Sarah; Gintautas, Daunys; Eggert, Thomas; Bremond-Gignac, Dominique; Bucci, Maria Pia
Dyslexia, v15 n3 p243-259 Aug 2009
Binocular yoking of saccades is essential for single vision of words during reading. This study examines the quality of binocular coordination in individuals with dyslexia, independent of the process of reading. Fifteen dyslexia children (11.2 plus or minus 1.4 years) and 15 non-dyslexia individuals (8 children, aged 11.1 plus or minus 1.3 years, and 7 adults, 24 plus or minus 3 years) were studied. Eye movements were recorded in two conditions. In the control condition, participants made saccades to a single target where the saccade direction and magnitude were controlled. In the experimental condition saccades were allowed to move freely while viewing paintings. The results indicated that, compared with the non-dyslexia group, the dyslexia group showed a larger saccade amplitude difference between the two eyes, as well as a larger conjugate post-saccadic drift, during painting exploration than that for saccades to a single target. While both groups showed a larger disconjugate post-saccadic drift during painting exploration relative to the control condition, this showed a negative correlation with saccade disconjugacy (i.e. disconjugate drift reduced the disparity) only for the non-dyslexia group. These results indicate that individuals with dyslexia have problems of binocular coordination, both during the saccade and fixations, which are independent of the reading process. It is suggested that this reflects an immaturity of the normal oculomotor learning mechanisms. (Contains 4 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A