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Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Unilateral implicit motor learning deficit in developmental dyslexia.

Yang Yang¹, Bi Hong-Yan

¹Institute of Psychology, Chinese Academy of Sciences, Beijing, China.

International Journal of Psychology : Journal International De Psychologie

|November 3, 2011

Summary

Children with developmental dyslexia show impaired implicit motor learning and slower reaction times, particularly with their left hand. Right-hand performance in these children was comparable to non-dyslexic peers, suggesting unilateral motor deficits.

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Published on: January 11, 2016

Area of Science:

Neuroscience
Developmental Psychology
Motor Control

Background:

Developmental dyslexia is linked to deficits in literacy, sensory, motor skills, and processing speed.
Implicit motor learning deficits in dyslexia may involve cerebellar dysfunction, but findings are conflicting.
Cerebellar lesion studies suggest hand-lateralized effects on motor learning, prompting investigation into dyslexia's hand-specific impact.

Purpose of the Study:

To investigate potential hand-lateralized differences in implicit motor learning in children with developmental dyslexia.
To examine the relationship between cerebellar functioning and implicit motor learning deficits in dyslexia.

Main Methods:

A one-handed serial reaction time task was administered to 27 Chinese children with developmental dyslexia and 27 age-matched controls (Grades 4-6).
Reaction times and implicit motor learning were assessed for both left-hand and right-hand responses.

Main Results:

Children with developmental dyslexia exhibited slower reaction times overall compared to controls.
Dyslexic children showed no significant implicit motor learning with their left hand.
No significant differences in reaction time or implicit motor learning were observed between groups when using the right hand.

Conclusions:

Chinese children with developmental dyslexia demonstrate unilateral deficits in motor skill and implicit motor learning, specifically affecting the left hand.
These findings provide partial support for the cerebellar deficit theory of developmental dyslexia.
The results highlight the importance of considering hand lateralization in the study of motor deficits associated with dyslexia.