Current psychology letters, 10, Vol. 1, 2003 | 2003

We reviewed five studies that relied on the same methodologies to determine the prevalence ofPhonological, Surface and Double-Deficit-Subtypes in developmental dyslexia. The proportion ofthese subtypes was found to vary according to the method (classical method or regressionmethod), the measure (accuracy or processing time), the dyslexics’ language (English or French)and their chronological age. Only two results appeared consistently across the studies. First, withthe classical method, and as compared to chronological age controls, most of the dyslexicsappeared to suffer from a double deficit. Second, with the regression method, and as compared toreading level controls, the surface profile, though not the phonological profile, almostdisappeared, thus suggesting that only the latter corresponds to a developmental deviance. Inaddition, in the sole study in which both accuracy and processing time were taken into account,in the comparison with reading level controls, only the phonological skills of both thephonological and the surface dyslexics were found to be impaired, either in accuracy or inReliability of Phonological and Surface Subtypes in Developmental Dyslexia: A... Current psychology letters, 10, Vol. 1, 2003 | 20037