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Immaturity of the oculomotor saccade and vergence interaction in dyslexic children: evidence from a reading and visual search study.

Bucci MP, Nassibi N, Gerard CL, Bui-Quoc E, Seassau M - PLoS ONE (2012)

Bottom Line: Studies comparing binocular eye movements during reading and visual search in dyslexic children are, at our knowledge, inexistent.Two visual tasks were used: text reading and visual search.The atypical eye movement's patterns observed in dyslexic children suggest a deficiency in the visual attentional processing as well as an immaturity of the ocular motor saccade and vergence systems interaction.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Psychologie et Neuropsychologie Cognitives, FRE 3292 CNRS - Université Paris Descartes, Boulogne Billancourt Cedex, France. maria-pia.bucci@parisdescartes.fr

ABSTRACT
Studies comparing binocular eye movements during reading and visual search in dyslexic children are, at our knowledge, inexistent. In the present study we examined ocular motor characteristics in dyslexic children versus two groups of non dyslexic children with chronological/reading age-matched. Binocular eye movements were recorded by an infrared system (mobileEBT®, e(ye)BRAIN) in twelve dyslexic children (mean age 11 years old) and a group of chronological age-matched (N = 9) and reading age-matched (N = 10) non dyslexic children. Two visual tasks were used: text reading and visual search. Independently of the task, the ocular motor behavior in dyslexic children is similar to those reported in reading age-matched non dyslexic children: many and longer fixations as well as poor quality of binocular coordination during and after the saccades. In contrast, chronological age-matched non dyslexic children showed a small number of fixations and short duration of fixations in reading task with respect to visual search task; furthermore their saccades were well yoked in both tasks. The atypical eye movement's patterns observed in dyslexic children suggest a deficiency in the visual attentional processing as well as an immaturity of the ocular motor saccade and vergence systems interaction.

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Related in: MedlinePlus

Amplitude of saccades.Mean values of amplitude of saccades (in deg) during reading and during visual search for the three groups of children tested. Vertical lines indicate the standard error.
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pone-0033458-g004: Amplitude of saccades.Mean values of amplitude of saccades (in deg) during reading and during visual search for the three groups of children tested. Vertical lines indicate the standard error.

Mentions: The absolute mean amplitude of saccades during reading and visual search task for each group of children is shown in Figure 4. The ANOVA showed a significant group effect (F(2,28) = 4.78, p<0.01) and a significant interaction between groups of children and the tasks (F(2,28) = 3.53, p<0.04). Post hoc comparison showed that the amplitude of saccades of the younger group of non dyslexic children was significant smaller with respect to the dyslexic group (p<0.01) and to the older group of non dyslexic children (p<0.008). The amplitude of saccades during reading task for the older group of non dyslexic children was significantly larger with respect to the other groups of children in both reading and visual search tasks (p<0.001). The ANOVA failed to show any significant task effect (F(2,28) = 1.41, p<0.24).


Immaturity of the oculomotor saccade and vergence interaction in dyslexic children: evidence from a reading and visual search study.

Bucci MP, Nassibi N, Gerard CL, Bui-Quoc E, Seassau M - PLoS ONE (2012)

Amplitude of saccades.Mean values of amplitude of saccades (in deg) during reading and during visual search for the three groups of children tested. Vertical lines indicate the standard error.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3306409&req=5

pone-0033458-g004: Amplitude of saccades.Mean values of amplitude of saccades (in deg) during reading and during visual search for the three groups of children tested. Vertical lines indicate the standard error.
Mentions: The absolute mean amplitude of saccades during reading and visual search task for each group of children is shown in Figure 4. The ANOVA showed a significant group effect (F(2,28) = 4.78, p<0.01) and a significant interaction between groups of children and the tasks (F(2,28) = 3.53, p<0.04). Post hoc comparison showed that the amplitude of saccades of the younger group of non dyslexic children was significant smaller with respect to the dyslexic group (p<0.01) and to the older group of non dyslexic children (p<0.008). The amplitude of saccades during reading task for the older group of non dyslexic children was significantly larger with respect to the other groups of children in both reading and visual search tasks (p<0.001). The ANOVA failed to show any significant task effect (F(2,28) = 1.41, p<0.24).

Bottom Line: Studies comparing binocular eye movements during reading and visual search in dyslexic children are, at our knowledge, inexistent.Two visual tasks were used: text reading and visual search.The atypical eye movement's patterns observed in dyslexic children suggest a deficiency in the visual attentional processing as well as an immaturity of the ocular motor saccade and vergence systems interaction.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Psychologie et Neuropsychologie Cognitives, FRE 3292 CNRS - Université Paris Descartes, Boulogne Billancourt Cedex, France. maria-pia.bucci@parisdescartes.fr

ABSTRACT
Studies comparing binocular eye movements during reading and visual search in dyslexic children are, at our knowledge, inexistent. In the present study we examined ocular motor characteristics in dyslexic children versus two groups of non dyslexic children with chronological/reading age-matched. Binocular eye movements were recorded by an infrared system (mobileEBT®, e(ye)BRAIN) in twelve dyslexic children (mean age 11 years old) and a group of chronological age-matched (N = 9) and reading age-matched (N = 10) non dyslexic children. Two visual tasks were used: text reading and visual search. Independently of the task, the ocular motor behavior in dyslexic children is similar to those reported in reading age-matched non dyslexic children: many and longer fixations as well as poor quality of binocular coordination during and after the saccades. In contrast, chronological age-matched non dyslexic children showed a small number of fixations and short duration of fixations in reading task with respect to visual search task; furthermore their saccades were well yoked in both tasks. The atypical eye movement's patterns observed in dyslexic children suggest a deficiency in the visual attentional processing as well as an immaturity of the ocular motor saccade and vergence systems interaction.

Show MeSH
Related in: MedlinePlus