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Neurosci Lett. 2018 Apr 3;671:82-87. doi: 10.1016/j.neulet.2018.02.016. Epub 2018 Feb 11.

Vertical disconjugacy during reading in dyslexic and non-dyslexic children.

Author information

1
Lyon Neuroscience Research Center. INSERM U1028, CNRS UMR 5292, Claude Bernard University Lyon 1, France; UMR 1141 INSERM, Paris Diderot University, Robert Debré Hospital, 48 Bd Sérurier, 75019 Paris, France; Department of Audiology and Otoneurological Evaluation, Civil Hospitals of Lyon, 5 place d'Arsonval, 69003 Lyon, France. Electronic address: gouleme.nathalie@gmail.com.
2
Lyon Neuroscience Research Center. INSERM U1028, CNRS UMR 5292, Claude Bernard University Lyon 1, France; UMR 1141 INSERM, Paris Diderot University, Robert Debré Hospital, 48 Bd Sérurier, 75019 Paris, France; Department of Audiology and Otoneurological Evaluation, Civil Hospitals of Lyon, 5 place d'Arsonval, 69003 Lyon, France.
3
Child and Adolescent Psychiatry Department, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France.
4
UMR 1141 INSERM, Paris Diderot University, Robert Debré Hospital, 48 Bd Sérurier, 75019 Paris, France; Child and Adolescent Psychiatry Department, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France.
5
Lyon Neuroscience Research Center. INSERM U1028, CNRS UMR 5292, Claude Bernard University Lyon 1, France; Department of Audiology and Otoneurological Evaluation, Civil Hospitals of Lyon, 5 place d'Arsonval, 69003 Lyon, France.
6
UMR 1141 INSERM, Paris Diderot University, Robert Debré Hospital, 48 Bd Sérurier, 75019 Paris, France; Vestibular and Oculomotor Evaluation Unit, ORL Dept., Robert Debré Hospital, 48 Bd Sérurier, 75019 Paris, France.

Abstract

PURPOSE:

The objective of this study was to explore vertical binocular coordination in dyslexic and non-dyslexic children during saccades and post-saccadic fixation period while reading a text.

METHODS:

Binocular eye movements were recorded by an infrared system (Mobile T2®, SuriCog) in thirty-six dyslexic children from 7.3 to 13.6 years of age (mean age: 10.4 ± 0.3 years) who were asked to silently read a four-line text during binocular viewing. Data were compared to those of thirty-six age-matched non-dyslexic children.

RESULTS:

Vertical disconjugacy during post-saccadic fixation was higher in dyslexic children with respect to non-dyslexic children group. Vertical disconjugacy was not age-dependent either for dyslexic children or for non-dyslexic children.

CONCLUSIONS:

The poor binocular vertical coordination observed in dyslexic children while reading could suggest a deficiency in the cerebellum and/or extra-ocular muscles involved in vertical eye alignment. Moreover, the fact that this vertical binocular coordination was not age-dependent could be due to an abnormal eye position and/or to a dysfunction of midbrain structures involved in vertical vergences.

KEYWORDS:

Children; Dyslexia; Fixation; Reading; Saccades; Vertical disconjugacy

PMID:
29444444
DOI:
10.1016/j.neulet.2018.02.016
[Indexed for MEDLINE]

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