NotesFAQContact Us
Collection
Advanced
Search Tips
Showing all 3 results Save | Export
Phenotypic "g" Early in Life: On the Etiology of General Cognitive Ability in a Large Population Sample of Twin Children Aged 2-4 Years.
Peer reviewed Peer reviewed
Spinath, Frank M.; Ronald, Angelica; Harlaar, Nicole; Price, Thomas S.; Plomin, Robert – Intelligence, 2003
Studied the emergence of general cognitive ability ("g") in early development and its genetic developmental etiology in 6,963 pairs of twins at 2, 3, and 4 years. Findings show phenotypic "g" to be evident early in life, with genetic influence less in early childhood than in middle childhood or after adolescence and that…
Descriptors: Child Development, Cognitive Ability, Environmental Influences, Genetics
Genetic and Environmental Molarity and Modularity of Cognitive Functioning in 2-Year-Old Twins.
Peer reviewed Peer reviewed
Petrill, Stephen A.; Saudino, Kimberly S.; Wilkerson, Bessie; Plomin, Robert – Intelligence, 2001
Investigated genetic and environmental influences on the similarity and differences among five tests of cognitive abilities in 1,958 pairs of same-sex twins born in 1994 in the United Kingdom. Results suggest a developmental trend from modularity to molarity when considered in relation to multivariate genetic results later in life that show that…
Descriptors: Child Development, Cognitive Ability, Cognitive Tests, Foreign Countries
Academic Achievement in Blacks and Whites: Are the Developmental Processes Similar?
Peer reviewed Peer reviewed
Rowe, David C.; Cleveland, Hobart H. – Intelligence, 1996
Genetic and environmental influences on academic achievement were studied for 314 pairs of white full siblings and 53 pairs of half siblings and 161 pairs of black full siblings and 106 half-sibling pairs (National Longitudinal Survey of Youth). Results support a common heritage view of the growth of academic knowledge. (SLD)
Descriptors: Academic Achievement, Blacks, Child Development, Environmental Influences