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Direct linkChristopher, Micaela E.; Hulslander, Jacqueline; Byrne, Brian; Samuelsson, Stefan; Keenan, Janice M.; Pennington, Bruce; DeFries, John C.; Wadsworth, Sally J.; Willcutt, Erik; Olson, Richard K. – Child Development, 2015
The present study explored the environmental and genetic etiologies of the longitudinal relations between prereading skills and reading and spelling. Twin pairs (n = 489) were assessed before kindergarten (M = 4.9 years), post-first grade (M = 7.4 years), and post-fourth grade (M = 10.4 years). Genetic influences on five prereading skills (print…
Descriptors: Genetics, Longitudinal Studies, Reading Comprehension, Environmental Influences
Harlaar, Nicole; Butcher, Lee M.; Meaburn, Emma; Sham, Pak; Craig, Ian W.; Plomin, Robert – Journal of Child Psychology and Psychiatry, 2005
Background: Five DNA markers (single-nucleotide polymorphisms, SNPs) have recently been found to be associated with general cognitive ability "g") in a sample of 7414 7-year-old twins. These children have also been studied at 2, 3, 4, and 7 years of age on measures of cognitive and language development and behaviour problems; family environment…
Descriptors: Discipline, Effect Size, Family Environment, Nonverbal Ability
