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  • Title: A few remarks on relating reaction time to magnocellular activity.
    Author: Skottun BC, Skoyles JR.
    Journal: J Clin Exp Neuropsychol; 2007 Nov; 29(8):860-6. PubMed ID: 17852604.
    Abstract:
    Studies have found dyslexic readers to have longer reaction times than nondyslexic readers. These results have been discussed relative to the hypothesis that dyslexia is caused by a magnocellular deficit. We here point out that attempts to link reaction times in dyslexic readers to magnocellular sensitivity face at least two serious problems: (a) The reaction time differences between dyslexics and controls appear too large to be attributable to deficits in the magnocellular system; (b) there is evidence to suggest that in the case of stimuli with contrast above about 10% behavioral reaction times may reflect parvocellular rather than magnocellular activity.
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