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Olson, Richard K.; Keenan, Janice M.; Byrne, Brian; Samuelsson, Stefan; Coventry, William L.; Corley, Robin; Wadsworth, Sally J.; Willcutt, Erik G.; DeFries, John C.; Pennington, Bruce F.; Hulslander, Jacqueline – Scientific Studies of Reading, 2011
Genetic and environmental relations between vocabulary and reading skills were explored longitudinally from preschool through Grades 2 and 4. At preschool there were strong shared-environment and weak genetic influences on both vocabulary and print knowledge but substantial differences in their source. Separation of etiology for vocabulary and…
Descriptors: Reading Comprehension, Genetics, Word Recognition, Etiology
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Furnes, Bjarte; Samuelsson, Stefan – Learning and Individual Differences, 2011
In this study, the relationship between latent constructs of phonological awareness (PA) and rapid automatized naming (RAN) was investigated and related to later measures of reading and spelling in children learning to read in different alphabetic writing systems (i.e., Norwegian/Swedish vs. English). 750 U.S./Australian children and 230…
Descriptors: Reading Difficulties, Spelling, Phonological Awareness, Word Recognition
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Furnes, Bjarte; Samuelsson, Stefan – Dyslexia, 2010
In this study, predictors of reading and spelling difficulties among children learning more transparent (Norwegian/Swedish) and less transparent (English) orthographies were examined longitudinally from preschool through Grade 2 using parallel versions of tests. A series of logistic regression analysis indicated three main findings. First,…
Descriptors: Reading Difficulties, Spelling, Phonological Awareness, Grade 2
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Ebejer, Jane L.; Coventry, William L.; Byrne, Brian; Willcutt, Erik G.; Olson, Richard K.; Corley, Robin; Samuelsson, Stefan – Scientific Studies of Reading, 2010
Twin children from Australia, Scandinavia, and the United States were assessed for inattention, hyperactivity-impulsivity, and reading across the first 3 school years. Univariate behavior-genetic analyses indicated substantial heritability for all three variables in all years. Longitudinal analyses showed one genetic source operating across the…
Descriptors: Elementary School Students, Foreign Countries, Attention Deficit Hyperactivity Disorder, Genetic Disorders