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Longitudinal Twin Study of Early Literacy Development: Preschool and Kindergarten Phases
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Byrne, Brian; Wadsworth, Sally; Corley, Robin; Samuelsson, Stefan; Quain, Peter; DeFries, John C.; Willcutt, Erik; Olson, Richard K. – Scientific Studies of Reading, 2005
We conducted behavior?genetic analyses of kindergarten reading, spelling, phonological awareness, rapid naming, and spoken sentence processing in 172 pairs of monozygotic and 153 pairs of same-sex dizygotic twin kindergarten children sampled in the United States and Australia. We also modeled progress from preschool to kindergarten in…
Descriptors: Foreign Countries, Phonology, Kindergarten, Spelling
Longitudinal Twin Study of Early Reading Development in Three Countries: Preliminary Results.
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Byrne, Brian; Delaland, Cara; Fielding-Barnsley, Ruth; Quain, Peter; Samuelsson, Stefan; Hoien, Torleiv; Corley, Robin; DeFries, John C.; Wadsworth, Sally; Willcutt, Erik; Olson, Richard K. – Annals of Dyslexia, 2002
Preliminary results from data on 146 Australian, 284 American, and 70 Norwegian preschool twins indicate reliable genetic influences on phonological awareness and memory and learning. Vocabulary, grammar, and morphology showed significant shared environment and negligible genetic effects. A print knowledge composite showed genetic and shared…
Descriptors: Beginning Reading, Biological Influences, Cognitive Processes, Dyslexia