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Harlaar, Nicole; Trzaskowski, Maciej; Dale, Philip S.; Plomin, Robert – Child Development, 2014
The genetic effects on individual differences in reading development were examined using genome-wide complex trait analysis (GCTA) in a twin sample. In unrelated individuals (one twin per pair, n = 2,942), the GCTA-based heritability of reading fluency was ~20%-29% at ages 7 and 12. GCTA bivariate results showed that the phenotypic stability of…
Descriptors: Reading Skills, Twins, Genetics, Individual Differences
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Song, Shuang; Su, Mengmeng; Kang, Cuiping; Liu, Hongyun; Zhang, Yuping; McBride-Chang, Catherine; Tardif, Twila; Li, Hong; Liang, Weilan; Zhang, Zhixiang; Shu, Hua – Developmental Science, 2015
In this 8-year longitudinal study, we traced the vocabulary growth of Chinese children, explored potential precursors of vocabulary knowledge, and investigated how vocabulary growth predicted future reading skills. Two hundred and sixty-four (264) native Chinese children from Beijing were measured on a variety of reading and language tasks over…
Descriptors: Longitudinal Studies, Vocabulary Development, Foreign Countries, Predictor Variables
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Ashby, Jane; Dix, Heather; Bontrager, Morgan; Dey, Rajarshi; Archer, Ana – School Psychology Review, 2013
Although phonemic awareness is a known predictor of early decoding and word recognition, less is known about relationships between phonemic awareness and text reading fluency. This longitudinal study is the first to investigate this relationship by measuring eye movements during picture matching tasks and during silent sentence reading. Time spent…
Descriptors: Phonemic Awareness, Eye Movements, Reading Fluency, Longitudinal Studies