Inter- and intrahemispheric processing of visual and auditory stimuli by dyslexic children and normal readers

Four experiments are presented in which manual reaction times to simple visual or auditory stimuli are compared for bilateral, ipsilateral, and contralateral presentations in normal and dyslexic children at three age levels: 8-9, 10-11, and 12-13 years. While bilateral presentations yielded faster reaction times, there were no consistent right-left differences nor consistent superiority of intra- versus interhemispheric reaction times in either of the experimental groups. The results failed to support the hypothesis of slower interhemispheric (cross-callosal) processing in dyslexic children.