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| Cognitive Development | 2 |
| Cognitive Processes | 2 |
| Mental Retardation | 2 |
| Symbolic Learning | 2 |
| Age Differences | 1 |
| Autism | 1 |
| Classification | 1 |
| Concept Formation | 1 |
| Developmental Stages | 1 |
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Peer reviewedStephens, Beth; McLaughlin, John A. – American Journal of Mental Deficiency, 1974
Descriptors: Age Differences, Classification, Cognitive Development, Cognitive Processes
Peer reviewedMorgan, Sam B. – Journal of Autism and Developmental Disorders, 1986
Findings from relevant research applying Piaget's theory to mental retardation, psychosis, and autism are reviewed. Many autistic individuals show an arrest in operative functions at the sensorimotor functions. The early arrest interferes with subsequent development of higher-level conceptual, symbolic, and social skills. (Author)
Descriptors: Autism, Cognitive Development, Cognitive Processes, Concept Formation
