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Related Experiment Video

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Stereoacuity Improvement using Random-Dot Video Games

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Published on: January 14, 2020

Reading text increases binocular disparity in dyslexic children.

Julie A Kirkby¹, Hazel I Blythe, Denis Drieghe

¹Psychology Department, Bournemouth University, Bournemouth, United Kingdom. jkirkby@bournemouth.ac.uk

|November 11, 2011

Summary

This study found that children with developmental dyslexia only show increased fixation disparity when reading, not during other tasks. This challenges the magnocellular theory of dyslexia.

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Area of Science:

Neuroscience
Developmental Psychology
Ophthalmology

Background:

Developmental dyslexia is a reading impairment in children despite normal IQ and education.
The magnocellular theory suggests visual pathway abnormalities cause dyslexia.
This theory posits deficient binocular coordination as the cause of dyslexia.

Purpose of the Study:

To investigate the role of binocular coordination in developmental dyslexia.
To test the claims of the magnocellular theory regarding dyslexia.

Main Methods:

Measured binocular coordination in adults, typically developing children, and children with dyslexia.
Assessed coordination during reading and a non-linguistic scanning task.

Main Results:

Children with dyslexia exhibited significantly increased fixation disparity exclusively during reading.
No significant difference in fixation disparity was found during the non-linguistic task.

Conclusions:

The findings cast doubt on the magnocellular theory's explanation for developmental dyslexia.
Increased fixation disparity during reading may stem from attentional or linguistic processing deficits.