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Longitudinal Genetic Analysis of Early Reading: The Western Reserve Reading Project
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Petrill, Stephen A.; Deater-Deckard, Kirby; Thompson, Lee Anne; Schatschneider, Chris; DeThorne, Laura S.; Vandenbergh, David J. – Reading and Writing: An Interdisciplinary Journal, 2007
We examined the genetic and environmental contribution to the stability and instability of reading outcomes in early elementary school using a sample of 283 twin pairs drawn from the Western Reserve Reading Project. Twins were assessed across two measurement occasions. In Wave 1, children were either in kindergarten or first grade. Wave 2…
Descriptors: Grade 1, Early Reading, Environmental Influences, Twins
Mathematical Ability of 10-Year-Old Boys and Girls: Genetic and Environmental Etiology of Typical and Low Performance
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Kovas, Yulia; Haworth, Claire M. A.; Petrill, Stephen A.; Plomin, Robert – Journal of Learning Disabilities, 2007
The genetic and environmental etiologies of 3 aspects of low mathematical performance (math disability) and the full range of variability (math ability) were compared for boys and girls in a sample of 5,348 children age 10 years (members of 2,674 pairs of same-sex and opposite-sex twins) from the United Kingdom (UK). The measures, which we…
Descriptors: National Curriculum, Nature Nurture Controversy, Genetics, Etiology
A Longitudinal Behavioral Genetic Analysis of Task Persistence
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Deater-Deckard, Kirby; Petrill, Stephen A.; Thompson, Lee A.; DeThorne, Laura S. – Developmental Science, 2006
Change in task persistence was assessed in two annual assessments using teachers', testers', and observers' ratings. Participants included 79 monozygotic and 116 same-sex dizygotic twin pairs who were in Kindergarten or 1st grade (4.3 to 7.9 years old) at the initial assessment. Task persistence was widely distributed and higher among older…
Descriptors: Twins, Persistence, Genetics, Young Children
The Effect of Gender upon Heritability and Common Environmental Estimates in Measures of Scholastic Achievement.
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Petrill, Stephen A.; Thompson, Lee Anne – Personality and Individual Differences, 1994
Examined the effects of gender on academic achievement for 138 mono- and 125 dizygotic twin pairs, ranging in age from 6 to 12 years. Results suggested that individual differences in academic achievement may be more influenced by genetic than environmental variance in females, and by environmental than genetic variance in males. (BC)
Descriptors: Academic Achievement, Children, Environmental Influences, Heredity
Exploring the Genetic and Environmental Etiology of High General Cognitive Ability in Fourteen- to Thirty-Six-Month-Old Twins.
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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
Reading Skills in Early Readers: Genetic and Shared Environmental Influences
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Petrill, Stephen A.; Deater-Deckard, Kirby; Thompson, Lee Anne; DeThorne, Laura S.; Schatschneider, Christopher – Journal of Learning Disabilities, 2006
The present study combined parallel data from the Northeast-Northwest Collaborative Adoption Projects (N2CAP) and the Western Reserve Reading Project (WRRP) to examine sibling similarity and quantitative genetic model estimates for measures of reading skills in 272 school-age sibling pairs from three family types (monozygotic twins, dizygotic…
Descriptors: Environmental Influences, Cognitive Ability, Twins, Reading Skills