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Immaturity of the Oculomotor Saccade and Vergence Interaction in Dyslexic Children

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Kiedy:
17:00, niedziela 22 cze 2025 (15 min.)
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Brief Abstract

To the best of our knowledge, at the time of the study, no research had compared binocular eye movements during reading and visual search in dyslexic children. In this study, we examined ocular motor characteristics in dyslexic children compared to two groups of non-dyslexic children, one group matched by chronological age and the other by reading age. Binocular eye movements were recorded using an infrared system (mobileEBTH, e(ye)BRAIN) in twelve dyslexic children (mean age: 11 years) and two groups of non-dyslexic children, one matched by chronological age (N = 9) and the other by reading age (N = 10).  Two visual tasks were used: text reading and visual search. Regardless of the task, the ocular motor behavior in dyslexic children was similar to that of reading age-matched non-dyslexic children, with more frequent and longer fixations, and poor binocular coordination during and after saccades. In contrast, the chronological age-matched non-dyslexic children showed fewer fixations and shorter fixation durations during the reading task compared to the visual search task. Additionally, their saccades were well-coordinated in both tasks. The atypical eye movement patterns observed in dyslexic children suggest a deficit in visual attentional processing, as well as immaturity in the interaction between the ocular motor saccade and vergence systems.

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