Abstract
The contribution of M(y)-cell activity within a framework of a magnocellular-deficit theory of dyslexia is currently unknown. Twenty-one dyslexic readers and 19 control readers were compared on their threshold detection for the frequency doubling illusion — an index of M(y)-cell activity, coherent motion, and a visual acuity task. The dyslexic group performed more poorly on detection of the frequency doubling illusion and coherent motion compared to the control group, but both groups performed comparably on the visual acuity task. The results from this study indicate that if a magno deficit exists in dyslexia, it may originate at a retinal level at least partly mediated by M(y)-cell abnormalities.
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