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A Multivariate Twin Study of Early Literacy in Japanese "Kana"
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Fujisawa, Keiko K.; Wadsworth, Sally J.; Kakihana, Shinichiro; Olson, Richard K.; DeFries, John C.; Byrne, Brian; Ando, Juko – Learning and Individual Differences, 2013
This first Japanese twin study of early literacy development investigated the extent to which genetic and environmental factors influence individual differences in prereading skills in 238 pairs of twins at 42 months of age. Twin pairs were individually tested on measures of phonological awareness, "kana" letter name/sound knowledge,…
Descriptors: Twins, Preschool Children, Emergent Literacy, Early Reading
Environmental and Genetic Influences on Prereading Skills in Australia, Scandinavia, and the United States
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Samuelsson, Stefan; Byrne, Brian; Quain, Peter; Wadsworth, Sally; Corley, Robin; DeFries, John C.; Willcutt, Eric; Olson, Richard – Journal of Educational Psychology, 2005
Individual differences in measures of prereading skills and in questionnaire measures of 4-5-year-old twins' print environments in Australia, Scandinavia, and the United States were explored with a behavioral-genetic design. Modest phenotypic correlations were found between environmental measures and the twins' print knowledge, general verbal…
Descriptors: Foreign Countries, Environmental Influences, Genetics, Prereading Experience