Dyslexics' Visual Attention Field

NCT ID: NCT03285789

Last Updated: 2024-02-29

Basic Information

• Recruitment Status: ACTIVE_NOT_RECRUITING
• Clinical Phase: NA
• Total Enrollment: 1460 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2018-07-25
• Study Completion Date: 2026-10-21

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.

Conditions

Dyslexia

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: OTHER
• Blinding Strategy: NONE

Study Groups

Dyslexics with reduced visual attention span

21 subjects diagnosed dyslexics with reduced visual attention span

Group Type: EXPERIMENTAL

Passing tests in dyslexics with reduced eva

Intervention Type: OTHER

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities.

All of these tests will be made during an unique visit of 1h30.

Dyslexics with normal visual attention span

Group Type: EXPERIMENTAL

Passing tests in dyslexics with reduced eva

Intervention Type: OTHER

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities.

All of these tests will be made during an unique visit of 1h30.

controls

Group Type: ACTIVE_COMPARATOR

Passing tests in controls

Intervention Type: OTHER

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it verbally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial test to judge his visuo spatial abilities.

"test de l'alouette" : reading test during 3 minutes, we note the number of word read and the errors. We obtain lexical age.

All of these tests will be made during an unique visit of 1h30.

Interventions

Passing tests in dyslexics with reduced eva

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities.

All of these tests will be made during an unique visit of 1h30.

Intervention Type: OTHER

Passing tests in controls

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it verbally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial test to judge his visuo spatial abilities.

"test de l'alouette" : reading test during 3 minutes, we note the number of word read and the errors. We obtain lexical age.

All of these tests will be made during an unique visit of 1h30.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

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

Exclusion Criteria

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

• Minimum Eligible Age: 3 Years
• Maximum Eligible Age: 12 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Hospices Civils de Lyon

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Laure PISELLA, PhD

Role: PRINCIPAL_INVESTIGATOR

INSERM U1028 - Impact - CRNL

Locations

U1028 INSERM - CNRS UMR 5292 Equipe ImpAct

Bron, , France

Countries

France

Other Identifiers

2017-A02525-48

Identifier Type: OTHER

Identifier Source: secondary_id

69HCL17_0333

Identifier Type: -

Identifier Source: org_study_id