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Updated: Oct 5, 2025

Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Preventing Children From Developing Dyslexia: A Premature Writing Hypothesis.

David S Mather¹

¹Department of Curriculum and Instruction, 8205University of Victoria, Victoria, BC, Canada.

Perceptual and Motor Skills

|January 27, 2022

Summary

Dyslexia may stem from early writing instruction in left-eye dominant children, linked to enhanced corpus callosum white matter and mirror-writing errors. Delaying writing until age 7-8 could prevent dyslexia development.

Keywords:

Hebrew callosal agenesis corpus callosum dyslexia eye dominance handwriting maturation right hemisphere

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Area of Science:

Neuroscience
Developmental Psychology
Educational Psychology

Background:

Dyslexia is potentially linked to early writing practices in left-eye dominant children using ipsilateral, right hemisphere pathways.
Atypical enhanced corpus callosum white matter in dyslexia suggests resistant right-to-left hemisphere communication.
This enhanced white matter aligns with uninhibited ipsilateral mirror-motor innervation, causing mirror-letter writing errors.

Purpose of the Study:

To investigate the theory that premature writing instruction contributes to dyslexia development.
To explore the role of corpus callosum white matter and interhemispheric communication in dyslexia.
To propose delayed writing instruction as a preventative measure for dyslexia.

Main Methods:

Review of existing research on dyslexia, eye dominance, and brain structure.
Analysis of findings related to corpus callosum white matter and reading intervention resistance.
Hypothetical model of visual-proprioceptive integration and anterior commissure activity during writing acquisition.

Main Results:

Enhanced corpus callosum white matter in dyslexic children correlates with mirror-writing errors.
Delayed writing instruction (7-8 years) may prevent these errors and dyslexia.
Hebrew reading proficiency in second graders and English reading in children with agenesis of the corpus callosum offer indirect support.

Conclusions:

Premature writing may be a causative factor in dyslexia, particularly in left-eye dominant children.
Maturation of visual-proprioceptive integration and interhemispheric transfer, facilitated by delayed writing instruction, is crucial.
Further empirical evidence is recommended to confirm the link between premature writing and dyslexia.