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Genetic and Environmental Influences on Prereading Skills and Early Reading and Spelling Development in the United States, Australia, and Scandinavia
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Samuelsson, Stefan; Olson, Richard; Wadsworth, Sally; Corley, Robin; DeFries, John C.; Willcutt, Erik; Hulslander, Jacqueline; Byrne, Brian – Reading and Writing: An Interdisciplinary Journal, 2007
Genetic and environmental influences on prereading skills in preschool and on early reading and spelling development at the end of kindergarten were compared among samples of identical and fraternal twins from the U.S. (Colorado), Australia, and Scandinavia. Mean comparisons revealed significantly lower preschool print knowledge in Scandinavia,…
Descriptors: Foreign Countries, Early Reading, Reading Instruction, Kindergarten
Preschool Twin Study of the Relation between Attention-Deficit/Hyperactivity Disorder and Prereading Skills
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Willcutt, Erik G.; Betjemann, Rebecca S.; Wadsworth, Sally J.; Samuelsson, Stefan; Corley, Robin; DeFries, John C.; Byrne, Brian; Pennington, Bruce F.; Olson, Richard K. – Reading and Writing: An Interdisciplinary Journal, 2007
Numerous studies have examined the etiology of the association between reading difficulties and attention-deficit hyperactivity disorder (ADHD) in school-age children, but little is known about the relation between prereading skills and ADHD behaviors prior to the beginning of formal reading instruction. A population-based sample of 809 pairs of…
Descriptors: Reading Difficulties, Reading Instruction, Etiology, Twins