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| Research article summary (published 30 Jan 2003): |
Genetic and environmental influences on individual differences in printed word recognition.
Full Abstract
The genetic and environmental etiologies of individual differences in printed word recognition and related skills were explored in 440 identical and fraternal twin pairs between 8 and 18 years of age. A theoretically driven measurement model identified five latent variables:
IQ, phoneme awareness, word recognition, phonological decoding, and orthographic coding. Cholesky decomposition models on these five latent constructs revealed the existence of both common and independent genetic effects, as well as non-shared environmental influences. There was evidence for moderate genetic influences common between IQ, phoneme awareness, and word-reading skills, and for stronger IQ-independent genetic influences that were common between phoneme awareness and word-reading skills, particularly phonological decoding. Phonological and orthographic coding skills in word recognition had both significant common and significant independent genetic influences, with implications for "dual-route" and "connectionist" reading models, subtypes of reading disabilities, and the remediation of reading disabilities.Copyright 2003 Elsevier Science (USA)
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Author information
Author/s: Gayán, Javier (J); Olson, Richard K (RK);
Affiliation: Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK. gayan@wel.ox.ac.uk
Grants: HD-11681 (Agency:United States NICHD) ; HD-27802 (Agency:United States NICHD) ; R01 HD-22223 (Agency:United States NICHD)
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S.; Twin Study
Journal: Journal of experimental child psychology (J Exp Child Psychol), published in United States. (Language: eng)
Reference: 2003-Feb; vol 84 (issue 2) : pp 97-123
Dates: Created 2003/02/28; Completed 2003/07/01; Revised 2007/11/14;
PMID: 12609495, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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