Evidence for Deficit in Interhemispheric Transfer of Information in Dyslexic Boys

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Abstract
Visual thresholds for identification of briefly flashed, lateralized letters were obtained for dyslexics and normal readers, age 11–15 years. Subjects were also tested for ability to localize tactile stimuli on the ringers and transfer information intermanually, a task failed by callosal agenesis patients (Dennis, 1976). Dyslexics differed significantly from normals on both tasks. Half the dyslexics demonstrated high threshold asymmetry across hemifields and many tactile localization errors, a pattern suggesting an “interhemispheric transfer deficit” as a cause of reading failure. Despite equally severe initial handicaps, dyslexics showing low, symmetric thresholds and few tactile errors, showed more reading improvement than did the others.