ERIC Number: EJ757955
Record Type: Journal
Publication Date: 2007-Feb
Reference Count: N/A
Longitudinal Twin Study of Early Literacy Development: Preschool through Grade 1
Byrne, Brian; Samuelsson, Stefan; Wadsworth, Sally; Hulslander, Jacqueline; Corley, Robin; DeFries, John C.; Quain, Peter; Willcutt, Erik G.; Olson, Richard K.
Reading and Writing: An Interdisciplinary Journal, v20 n1-2 p77-102 Feb 2007
Grade 1 literacy skills of twin children in Australia (New South Wales) and the United States (Colorado) were explored in a genetically sensitive design (N = 319 pairs). Analyses indicated strong genetic influence on word and nonword identification, reading comprehension, and spelling. Rapid naming showed more modest, though reliable, genetic influence. Phonological awareness was subject to high nonshared environment and no reliable genetic effects, and individual measures of memory and learning were also less affected by genes than nonshared environment. Multivariate analyses showed that the same genes affected word identification, reading comprehension, and spelling. Country comparisons indicated that the patterns of genetic influence on reading and spelling in Grade 1 were similar, though for the U.S. but not the Australian children new genes came on stream in the move from kindergarten to Grade 1. We suggest that this is because the more intensive kindergarten literacy curriculum in New South Wales compared with Colorado, consistent with the mean differences between the two countries, means that more of the genes are "online" sooner in Australia because of accelerated overall reading development.
Descriptors: Longitudinal Studies, Emergent Literacy, Preschool Children, Kindergarten, Foreign Countries, Grade 1, Spelling, Reading Comprehension, Genetics, Literacy Education, Twins, Word Recognition, Reading Skills, Memory, Learning Processes, Environmental Influences, Cross Cultural Studies
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Publication Type: Journal Articles; Reports - Research
Education Level: Early Childhood Education; Grade 1; Kindergarten
Authoring Institution: N/A
Identifiers - Location: Australia; Colorado; United States