Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children
Objective. Latency of eye movements depends on cortical structures while speed of execution and accuracy depends mostly on subcortical brainstem structures. Prior studies reported in dyslexic reader children abnormalities of latencies of saccades (isolated and combined with vergence); such abnormali...
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| Format: | Article |
| Language: | English |
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Wiley
2009-01-01
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| Series: | Journal of Ophthalmology |
| Online Access: | http://dx.doi.org/10.1155/2009/325214 |
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| _version_ | 1850222893238059008 |
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| author | Maria Pia Bucci Marine Vernet Christophe-Loïc Gerard Zoï Kapoula |
| author_facet | Maria Pia Bucci Marine Vernet Christophe-Loïc Gerard Zoï Kapoula |
| author_sort | Maria Pia Bucci |
| collection | DOAJ |
| description | Objective. Latency of eye movements depends on cortical structures while speed of execution and accuracy depends mostly on subcortical brainstem structures. Prior studies reported in dyslexic reader children abnormalities of latencies of saccades (isolated and combined with vergence); such abnormalities were attributed to deficits of fixation control and of visual attention. In this study we examine speed and accuracy characteristics of horizontal eye movements in natural space (saccades, vergence and combined movements) in dyslexic reader children. Methods. Two paradigms are tested: gap paradigm (fixation offset 200 ms prior to target onset), producing shorter latencies, in both non-dyslexic reader and dyslexic reader children and simultaneous paradigm. Seventeen dyslexic reader children (mean age: 12±0.08 years) and thirteen non-dyslexic reader children (mean age: 12±1 years) were tested. Horizontal eye movements from both eyes were recorded simultaneously by a photoelectric device (Oculometer, Dr. Bouis). Results. For all movements tested (saccades, vergence, isolated or combined) and for both paradigms, the mean velocity and accuracy were similar in dyslexic readers and non-dyslexic readers; no significant difference was found. Conclusion. This negative but important result, suggests no dysfunction of brainstem ocular motor circuits in dyslexic readers. It contrasts results on latencies related to visual attention dysfunction at cortical level. |
| format | Article |
| id | doaj-art-6bbab5ae49d9460c8b50449fe2cf4964 |
| institution | OA Journals |
| issn | 2090-004X 2090-0058 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Ophthalmology |
| spelling | doaj-art-6bbab5ae49d9460c8b50449fe2cf49642025-08-20T02:06:08ZengWileyJournal of Ophthalmology2090-004X2090-00582009-01-01200910.1155/2009/325214325214Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader ChildrenMaria Pia Bucci0Marine Vernet1Christophe-Loïc Gerard2Zoï Kapoula3FRE 3292 CNRS, Université René Descartes Paris V, 71 avenue Edouard Vaillant, 92774 Boulogne Billancourt Cedex, FranceFRE 3154 CNRS, Pôle Chirurgie ORL-OPH, Hôpital Robert Debré, 48 boulevard Sérurier, 75019 Paris, FranceService de Psychopathologie de l'Enfant et de l'Adolescent, Hôpital Robert Debré, 48 boulevard Sérurier, 75019 Paris, FranceFRE 3154 CNRS, Pôle Chirurgie ORL-OPH, Hôpital Robert Debré, 48 boulevard Sérurier, 75019 Paris, FranceObjective. Latency of eye movements depends on cortical structures while speed of execution and accuracy depends mostly on subcortical brainstem structures. Prior studies reported in dyslexic reader children abnormalities of latencies of saccades (isolated and combined with vergence); such abnormalities were attributed to deficits of fixation control and of visual attention. In this study we examine speed and accuracy characteristics of horizontal eye movements in natural space (saccades, vergence and combined movements) in dyslexic reader children. Methods. Two paradigms are tested: gap paradigm (fixation offset 200 ms prior to target onset), producing shorter latencies, in both non-dyslexic reader and dyslexic reader children and simultaneous paradigm. Seventeen dyslexic reader children (mean age: 12±0.08 years) and thirteen non-dyslexic reader children (mean age: 12±1 years) were tested. Horizontal eye movements from both eyes were recorded simultaneously by a photoelectric device (Oculometer, Dr. Bouis). Results. For all movements tested (saccades, vergence, isolated or combined) and for both paradigms, the mean velocity and accuracy were similar in dyslexic readers and non-dyslexic readers; no significant difference was found. Conclusion. This negative but important result, suggests no dysfunction of brainstem ocular motor circuits in dyslexic readers. It contrasts results on latencies related to visual attention dysfunction at cortical level.http://dx.doi.org/10.1155/2009/325214 |
| spellingShingle | Maria Pia Bucci Marine Vernet Christophe-Loïc Gerard Zoï Kapoula Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children Journal of Ophthalmology |
| title | Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children |
| title_full | Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children |
| title_fullStr | Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children |
| title_full_unstemmed | Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children |
| title_short | Normal Speed and Accuracy of Saccade and Vergence Eye Movements in Dyslexic Reader Children |
| title_sort | normal speed and accuracy of saccade and vergence eye movements in dyslexic reader children |
| url | http://dx.doi.org/10.1155/2009/325214 |
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