Callosal transfer in different subtypes of developmental dyslexia.
Sixteen controls (age 6-13) and 20 native Italian children with developmental dyslexia (age 7-15) received a test of callosal transfer of tactile information. Among the dyslexic children, 7 had a diagnosis of L-type, 7 of P-type and 6 of M-type dyslexia 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) vs. the uncrossed condition. In the same condition, 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 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.
Fabbro
F
F
Unit of Neuropsychology, Istituto Scientifico E. Medea, Bosisio Parini, LC, Italy. fabbro@bp.lnf.it
Pesenti
S
S
Facoetti
A
A
Bonanomi
M
M
Libera
L
L
Lorusso
M L
ML
D000293:Adolescent; D000375:Aging / Q000502:physiology; D001931:Brain Mapping; D002648:Child; D003337:Corpus Callosum / Q000503:physiopathology*; D004410:Dyslexia / Q000145:classification / Q000503:physiopathology*; D005260:Female; D005385:Fingers / Q000503:physiopathology; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D012016:Reference Values; D014110:Touch / Q000502:physiology