Dyslexia, Motor Control and Proprioception

Institut National de la Santé Et de la Recherche Médicale, France56 enrolled

Overview

The investigators hypothesize that children with dyslexia present proprioceptive disorders and the purpose of the present study is to better understand relationships between motor control, proprioception and academic learnings. The investigators compare a group of French students with and without dyslexia aged 10-12.

2 groups of children (dyslexics and control) will be evaluated on 2 tasks: * Evaluation of the proprioception: Perception of the speed and Perception of the position * Evaluation of the motor learning: Estimation of state in the framework of a motor perturbation

Study Type

INTERVENTIONAL

Allocation

Purpose

BASIC_SCIENCE

Masking

NONE

Enrollment

Conditions

Dyslexia

Interventions

Evaluation of proprioceptionBEHAVIORAL

Velocity perception and Position perception

Evaluation of motor learningBEHAVIORAL

Motor accurancy and State Estimation with visual perturbations

Evaluation of written languageBEHAVIORAL

Text reading, Identifying words and Phonological awareness: phonemic blending and phonemic elision

Eligibility

Sex: ALLMin age: 10 YearsMax age: 12 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion criteria for all children * Child with a French social security * School child * Native French speaker * right-handed * Normal or corrected vision * Without neurological or psychiatric histories * Agree to participate in the study in agreement with parental rights representatives For the dyslexic group : * pluridisciplinary diagnostic * never consulted for proprioception before * without any other leaning disorders like dysphasia * attention deficit hyperactivity disorder (ADHD) or developmental coordination disorder (DCD) For the control group : * regular school attendance * never consulted for learning disabilities * No learning disorders known for their parents or siblings. Exclusion criteria for all children * genetic disorder * neurological or psychiatric history * Delayed psychomotor development * Reeducation or current treatment interfering with the evaluation

Locations (1)

Inserm U1093

Dijon, Bourgogne-Franche-Comté, France

Outcomes

Primary Outcomes

Evaluation of proprioception through velocity perception

The ability to perceive motion at 3 different velocities for 3 different joints is assessed using a motorized ergometer. A passive movement is performed by the ergometer and children are tasked to press a button as soon as they feel the movement. We calculate the angle of detection for each speed and compare it between Dyslexic and healthy children.

Time frame: 1day

Secondary Outcomes

Evaluation of proprioception through position perception

The ability to perceive position is assessed using an ergometer that produces passive movements of 3 different amplitudes on the dominant arm. In a second time, the ergometer produces a passive movement of the same arm and children are tasked to press a button as soon as they feel they are in the exact previously-experienced position. We calculate the angular error and compare it between Dyslexic and healthy children.

Time frame: 1 day

Motor learning

The ability to learn new motor tasks is assessed using virtual reality and motor acquisition systems. First we evaluate the motor accuracy and the state estimation by pointing tests. Then visual perturbations are introduced during pointing. Finally, we evaluate motor accuracy and state estimation again.

Time frame: 1 day

Text reading

The ability to read aloud a text is assessed using the French standardized test " Alouette ", which provide accuracy in reading aloud age-normed texts (ratio between words that have been correctly read and all the words that have been read).

Time frame: 1day

Phonological awareness: phonemic blending and phonemic elision

The ability to derive a phonemic pattern from distinct phonemic units or to substitute a phonemic pattern for another is assessed using the French standardized test " Nepsy2, phonological process " which provide standard deviation in reading aloud by the investigator.

Data from ClinicalTrials.gov

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