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Pennington, Bruce F.; Moon, Jennifer; Edgin, Jamie; Stedron, Jennifer; Nadel, Lynn – Child Development, 2003
Tested prefrontal and hippocampal functions in school-aged individuals with Down syndrome (DS) compared functions with those of typically developing children individually matched on mental age. Found that hippocampal and prefrontal composite scores contributed unique variance to the prediction of mental age and adaptive behavior. Noted a…
Descriptors: Adaptive Behavior (of Disabled), Brain, Children, Disabilities

Ansari, Daniel; Donlan, Chris; Thomas, Michael S.C.; Ewing, Sandra A.; Peen, Tiffany; Kapmiloff-Smith, Annette – Journal of Experimental Child Psychology, 2003
Understanding of the cardinality principle in children with Williams Syndrome (WS) was compared to that of typically developing children. Findings indicated that such understanding was extremely delayed in WS children and only at the level predicted by their visuo-spatial mental age. Findings suggested that visuo-spatial ability played a greater…
Descriptors: Children, Comparative Analysis, Computation, Concept Formation