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Ritchie, Stuart J.; Bates, Timothy C.; Plomin, Robert – Child Development, 2015
Evidence from twin studies points to substantial environmental influences on intelligence, but the specifics of this influence are unclear. This study examined one developmental process that potentially causes intelligence differences: learning to read. In 1,890 twin pairs tested at 7, 9, 10, 12, and 16 years, a cross-lagged…
Descriptors: Intelligence, Twins, Environmental Influences, Child Development
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Hill, Trenesha L.; Gray, Sarah A. O.; Kamps, Jodi L.; Enrique Varela, R. – Journal of Autism and Developmental Disorders, 2015
The present study examined the moderating effects of intellectual functioning and ASD symptom severity on the relation between age and adaptive functioning in 220 youth with autism spectrum disorder (ASD). Regression analysis indicated that intellectual functioning and ASD symptom severity moderated the relation between age and adaptive…
Descriptors: Severity (of Disability), Symptoms (Individual Disorders), Intellectual Development, Autism