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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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Levitt, Eugene A.; And Others – Child Development, 1972
It was concluded that while retinoblastoma per se is not associated with intellectual superiority or inferiority, retinoblastoma associated with blindness may result in selective cognitive superiority. (Authors)
Descriptors: Cognitive Processes, Comparative Analysis, Intellectual Development, Intelligence
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Petrill, Stephen A.; And Others – Child Development, 1998
Examined the origins of high general cognitive ability (g) in twins who were participating in the MacArthur Longitudinal Twin Study. Formed high g groups from the 19th percentile and above at each age. Results suggested increasing genetic influence and increasing genetic stability from 14 to 36 months and substantial genetic influences with…
Descriptors: Cognitive Ability, Cognitive Development, Etiology, Intellectual Development
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Levinson, Elizabeth J. – Child Development, 1971
Descriptors: Concept Formation, Control Groups, Definitions, Intellectual Development
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Nicholls, John N.; And Others – Child Development, 1986
Explores age differences (6 to 22 years of age) in conceptions about the nature of the skills required by verbal and nonverbal (abstract) intelligence tests. (HOD)
Descriptors: Age Differences, Cognitive Ability, Cognitive Development, Concept Formation
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Hagen, John W.; And Others – Child Development, 1990
Cognitive ability of nondiabetic children and early and late onset diabetic children was compared. Diabetic children scored in the normal range in intelligence and academic performance, but showed evidence of school difficulties and memory deficiencies. Children's perceived self-competence and parents' reports of children's functioning and…
Descriptors: Academic Achievement, Adolescents, Age Differences, Competence
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Burchinal, Margaret R.; Campbell, Frances A.; Bryant, Donna M.; Wasik, Barbara H.; Ramey, Craig T. – Child Development, 1997
Examined influences on African-American children's cognitive development between 6 months and 8 years. Found that more optimal patterns of development were associated with intensive early educational child care, responsive home stimulation, and higher maternal IQ. Child care experiences were related to cognitive performance through enhancing…
Descriptors: Black Students, Blacks, Children, Cognitive Development