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Related Concept Videos

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
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Author Spotlight: Exploring the Link Between Time Perception of Visual Stimuli and Reading Skills
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Vertical saccades in dyslexic children.

Aimé Tiadi1, Magali Seassau2, Emmanuel Bui-Quoc3

  • 1UMR 1141 INSERM-Université Paris 7, Hôpital Robert Debré, 48 Bl Sérurier, 75019 Paris, France.

Research in Developmental Disabilities
|August 25, 2014
PubMed
Summary

This study reveals that dyslexic children exhibit impaired vertical saccades, characterized by longer reaction times and reduced speed. These visual-motor deficits may stem from cortical and peripheral eye muscle issues, potentially linked to attention.

Keywords:
ChildrenDyslexiaVertical saccades

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Ophthalmology

Background:

  • Vertical saccades, crucial for visual tracking, have not been previously investigated in children with dyslexia.
  • Understanding these eye movements in dyslexia may offer insights into underlying neurological differences.

Purpose of the Study:

  • To investigate and compare vertical visually guided saccades between dyslexic and non-dyslexic children.
  • To identify potential differences in saccade parameters like latency, gain, velocity, and direction asymmetry.

Main Methods:

  • Utilized an infrared video-oculography system (mobileEBT®, e(ye)BRAIN) to record binocular eye movements.
  • Compared saccade performance in 56 dyslexic children with 56 age-matched non-dyslexic controls.

Main Results:

  • Dyslexic children demonstrated significantly longer saccade latency and a higher incidence of anticipatory and express saccades.
  • Reduced gain and mean velocity were observed in dyslexic children's vertical saccades.
  • An up-down asymmetry in latency was found in dyslexic children, in addition to the gain and velocity asymmetry seen in controls.

Conclusions:

  • Findings suggest impairments in cortical areas controlling vertical saccades and peripheral extra-ocular oblique muscles in dyslexic children.
  • A visuo-attentional bias might explain the observed up-down asymmetry in vertical saccade triggering among dyslexic individuals.