Brain imaging reveals that, in dyslexics, the visual-motion area of the brain fails to activate. This failure may be a marker for a deviation in brain function which remained largely invisible until complex writing systems evolved.
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Frith, C., Frith, U. A biological marker for dyslexia. Nature 382, 19–20 (1996). https://doi.org/10.1038/382019a0
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DOI: https://doi.org/10.1038/382019a0
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