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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