“The lack of asymmetry might be the biological and anatomical basis of reading and spelling disabilities,” the authors wrote.
Just as people are either right- or left-handed, most people have a dominant eye. Most people are right-eyed. The dominant eye has more receptors than the other, and sends a better image to the brain. The asymmetrical images allow the brain to choose easily. Non-dyslectic people see only one version of the visual scene.
But dyslexic people don't have a dominant eye. The brain has to constantly switch back and forth between the two images, causing confusion and distortion.
Dyslexic people therefore make “mirror errors,” such as confusing the letters “b” and “d,” the researchers told The Guardian.
They also found something else that might lead to a treatment that was effective in early trials.
There is a delay of a 10 thousandth of a second between the primary image and the mirror image in opposing hemispheres in the brain.
The scientists used an LED lamp that flashes so fast that it is invisible to the naked eye. It canceled out one of the mirror images and erased the confusion in trial subjects, who called the device the "magic lamp."
It needs further testing, Ropars said, but the findings are promising.
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