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Reduced perceptual span in dyslexic children: a gaze-contingent eye-tracking study.
Antonin Rossier-Bisaillon1, Julie Robidoux1, Brigitte Stanké2
1École d'orthophonie et d'audiologie de l'Université de Montréal, 7077, avenue du Parc, Montréal H3N 1X7, Canada; Centre de recherche interdisciplinaire en réadaptation du Montréal métropolitain (CRIR), 6363, chemin Hudson, Montréal H3S 1M9, Canada; Institut Universitaire sur la réadaptation en déficience physique de Montréal (IURDPM), 2275, avenue Laurier Est, Montréal H2H 2N8, Canada; Laboratoire de Recherche en Neurosciences et Électrophysiologie Cognitive, Recherche CIUSSS-NÎM, Hôpital en santé mentale Rivière des Prairies, 7070, boulevard Perras, Montréal H1E 1A4, Canada.
Children with dyslexia have a smaller perceptual span, meaning they extract less information from text during reading. This study used eye-tracking to show reduced parafoveal processing in dyslexic children, impacting reading fluency.
Area of Science:
- Cognitive Psychology
- Developmental Neuroscience
- Educational Psychology
Background:
- The perceptual span is crucial for fluent reading in typically developing children, enabling parafoveal preview.
- The perceptual span in children with dyslexia is largely undocumented, with inconsistent findings in adults.
- Theoretical models predict a reduced perceptual span in dyslexia, necessitating experimental investigation.
Purpose of the Study:
- To experimentally investigate the perceptual span in children with dyslexia.
- To compare the reading characteristics of dyslexic children and age-matched controls using eye-tracking.
- To test the hypothesis of a reduced perceptual span in children with dyslexia.
Main Methods:
- An eye-tracking study involving 14 dyslexic children and 24 controls (aged 9-12).
- A gaze-contingent window paradigm manipulated visible text characters around fixation.
- Measured reading speed, accuracy, fixation duration, and saccade length across varying window sizes.
Main Results:
- Children with dyslexia showed a diminished response to window size changes on reading speed compared to controls.
- Eye-tracking data revealed increased foveal load and reduced parafoveal processing in dyslexic children.
- Reading accuracy remained unaffected by window size manipulations in both groups.
Conclusions:
- Findings support the foveal load hypothesis in dyslexia.
- Reduced preview benefit and increased visual crowding contribute to a smaller effective perceptual span in dyslexic readers.
- Limited attentional resources for parafoveal processing due to foveal word identification effort constrain reading in dyslexia.
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