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On the contrary, dyslexic children show a remarkable homogeneity in the profiles of their cognitive abilities (e.g. Siegel, 1993) and, in the cases where there is heterogeneity; it seems to be a result of the particular definition. Evidence indicates that the definition of acquired dyslexia used in the study can influence the conclusions made about the heterogeneity of the population. For example, Siegel and Ryan (1989) have shown that if dyslexia is defined as a deficit in word reading skills, all the dyslexic children have deficits in phonological processing, working and short-term memory, and syntactic awareness.
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