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Peer reviewedLiss, Miriam; Fein, Deborah; Bullard, Sarah; Robins, Diana – Journal of Autism and Developmental Disorders, 2000
A study involving 18 individuals with pervasive developmental disorders (PDD) (ages 9-21) and 67 controls found total score on the Biber Cognitive Estimation Test for both individuals with PDD and controls progressed consistently with mental age, development being the most dramatic around the mental age of 8 years. (Contains references.)…
Descriptors: Adolescents, Age Differences, Children, Cognitive Ability
Peer reviewedGeiger, Diane M.; Smith, David T.; Creaghead, Nancy A. – Journal of Autism and Developmental Disorders, 2002
A study compared the extent of agreement between parents and professional evaluators regarding the cognitive level of 41 children (ages 2-10) with autism. Significant differences were found. In addition, there was significant correlation between the level of agreement and cognitive functioning; agreement increased as the level of cognitive…
Descriptors: Autism, Children, Cognitive Ability, Cognitive Development
