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Direct linkAstrom, Raven L.; Wadsworth, Sally J.; Olson, Richard K.; Willcutt, Erik G.; DeFries, John C. – Learning and Individual Differences, 2012
Reading performance data from 254 pairs of identical (MZ) and 420 pairs of fraternal (DZ) twins, 8.0 to 20.0 years of age, were subjected to multiple regression analyses. An extension of the DeFries-Fulker (DF) analysis (DeFries & Fulker, 1985, 1988) that facilitated inclusion of data from 303 of their nontwin siblings was employed. In addition to…
Descriptors: Reading Difficulties, Twins, Genetics, Environmental Influences
Luo, Yu L. L.; Kovas, Yulia; Haworth, Claire M. A.; Plomin, Robert – Learning and Individual Differences, 2011
The genetic and environmental origins of individual differences in mathematical self-evaluation over time and its association with later mathematics achievement were investigated in a UK sample of 2138 twin pairs at ages 9 and 12. Self-evaluation indexed how good children think they are at mathematical activities and how much they like those…
Descriptors: National Curriculum, Twins, Mathematics Achievement, Etiology
Hoekstra, Rosa A.; Bartels, Meike; Boomsma, Dorret I. – Learning and Individual Differences, 2007
In a longitudinal genetic study we explored which factors underlie stability in verbal and nonverbal abilities, and the extent to which the association between these abilities becomes stronger as children grow older. Measures of verbal and nonverbal IQ were collected in Dutch twin pairs at age 5, 7, 10, 12 and 18 years. The stability of both…
Descriptors: Twins, Intervals, Structural Equation Models, Intelligence Quotient
