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Sixteen control children (ages six to thirteen years) and twenty native Italian children with developmental dyslexia (ages seven to fifteen years) received a test of callosal transfer of tactile information. Among the dyslexic children, seven had a diagnosis of L-type, seven of P-type, and six of M-type,
according to Bakker's classification. Both control children and children with dyslexia made a significantly larger number of errors in the crossed localization condition (implying callosal transfer of tactile information) when compared to the uncrossed condition. On examination of performance in the uncrossed condition, it was noted that children with dyslexia made a significantly larger number of errors than controls. In the crossed localization condition, L-types and M-types made a significantly larger number of errors than did P-types and controls, while there was no significant difference in performance between P-types and controls. These findings are discussed in terms of defective callosal transfer or deficient somatosensory representation in children with L- and M-dyslexia.