Dyslexics' Visual Attention Field

Not Applicable

Active, not recruiting

• Conditions: Dyslexia
• Interventions: Other: Passing tests in dyslexics with reduced eva; Other: Passing tests in controls

• Registration Number: NCT03285789
• Lead Sponsor: Hospices Civils de Lyon

Brief Summary

dyslexia is often considered like a phonological deficit but some researches show that a visual attention (V-A) deficit can occur in dyslexia. The investigator want to show that some dyslexics have a reduced V-A field in visual search when the investigator use separable feature (letter-like).

If the investigator demonstrate that, he will show that V-A deficit can be transpose to an ability acquired before reading, the visual search. Therefore, the V-A deficit can't be a consequence of reading problem but a cause of it for some dyslexics.

The investigator could imagine an earlier diagnosis for children at risk to develop dyslexia and make reeducation more specific for the deficit observed.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2017-09-14
• Study First Submitted QC: 2017-09-14
• Study First Posted: 2017-09-18
• Study Start: 2018-07-25
• Status Verified: 2024-02
• Last Update Submitted: 2024-02-28
• Last Update Posted: 2024-02-29
• Primary Completion: 2026-10-21
• Study Completion: 2026-10-21

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 1460

Inclusion Criteria

• normal or corrected to normal vision
• diagnosed dyslexics with a recent "alouette" test

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Exclusion Criteria

• other developmental problem (dysphasia, dyspraxia, ADHD)
• strabismus, amblyopia, oculomotor paralysis

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Dyslexics with normal visual attention span	Passing tests in dyslexics with reduced eva	-
Dyslexics with reduced visual attention span	Passing tests in dyslexics with reduced eva	21 subjects diagnosed dyslexics with reduced visual attention span
controls	Passing tests in controls	-

Primary Outcome Measures

Name	Time	Method
Respond time in visual search in different condition of view (full view or reduced view) with separable feature.	Day 0	The subject will have to find a target among distractors, when he will find it, he will have to push a button and we will have his respond time. We will compare the respond time in two view condition: the participant will see all the visual scene or he will have reduced visible window so he won't see all the scene, the periphery will be hide and he will have to move his sight to show it.

Secondary Outcome Measures

Name	Time	Method
respond time in function of the distractors' number	Day 0	The subject will have to find a target among distractors, when he will find it, he will have to push a button and we will collect his respond time. We compare the respond time between two number of distractors (24 or 48)
visual attention span (VAS)	Day 0	the subject have to report orally a 5 letters' string presented during 200 ms, the investigator could see if a correlation exist between VAS and RT, VAS and visual exploration, VAS and visuo spatial perception.
visual exploration of the scene	Day 0	with an eye tracker the investigator will analyze the ocular movements during visual search (saccades and fixations) and the equip will compare the visual behavior between the different groups and the different conditions.
visuo-spatial perception	Day 0	the investigator will test with different exercises the elementary visuo spatial perception of the participant and he will compare between groups and also he will make correlation with the respond time in visual search.

Trial Locations

Locations (1)

U1028 INSERM - CNRS UMR 5292 Equipe ImpAct; 🇫🇷 Bron, France