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Paterson, Sarah J.; Girelli, Luisa; Butterworth, Brian; Karmiloff-Smith, Annette – Journal of Child Psychology and Psychiatry, 2006
Background: Several theorists maintain that exact number abilities rely on language-relevant processes whereas approximate number calls on visuo-spatial skills. We chose two genetic disorders, Williams syndrome and Down's syndrome, which differ in their relative abilities in verbal versus spatial skills, to examine this hypothesis. Five…
Descriptors: Genetic Disorders, Mental Age, Age, Mental Retardation