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Direct linkCoventry, William; Anton-Mendez, Ines; Ellis, Elizabeth M.; Levisen, Christina; Byrne, Brian; van Daal, Victor H. P.; Ellis, Nick C. – Language Learning, 2012
We present one of the first behavior-genetic studies of individual differences in school students' levels of achievement in instructed second language acquisition (ISLA). We assessed these language abilities in Australian twin pairs (maximum N pairs = 251) by means of teacher ratings, class rankings, and self-ratings of proficiency, and used the…
Descriptors: Twins, Second Language Learning, Genetics, Etiology
Hart, Sara A.; Petrill, Stephen A.; DeThorne, Laura S.; Deater-Deckard, Kirby; Thompson, Lee A.; Schatschneider, Chris; Cutting, Laurie E. – Journal of Child Psychology and Psychiatry, 2009
Background: Despite the well-replicated relationship between the home literacy environment and expressive vocabulary, few studies have examined the extent to which the home literacy environment is associated with the development of early vocabulary ability in the context of genetic influences. This study examined the influence of the home literacy…
Descriptors: Twins, Mothers, Home Visits, Emergent Literacy
Waber, Deborah P. – Guilford Publications, 2010
Experts have yet to reach consensus about what a learning disability is, how to determine if a child has one, and what to do about it. Leading researcher and clinician Deborah Waber offers an alternative to the prevailing view of learning disability as a problem contained within the child. Instead, she shows how learning difficulties are best…
Descriptors: Reading Difficulties, Learning Problems, Twins, Learning Disabilities
Harlaar, Nicole; Butcher, Lee M.; Meaburn, Emma; Sham, Pak; Craig, Ian W.; Plomin, Robert – Journal of Child Psychology and Psychiatry, 2005
Background: Five DNA markers (single-nucleotide polymorphisms, SNPs) have recently been found to be associated with general cognitive ability "g") in a sample of 7414 7-year-old twins. These children have also been studied at 2, 3, 4, and 7 years of age on measures of cognitive and language development and behaviour problems; family environment…
Descriptors: Discipline, Effect Size, Family Environment, Nonverbal Ability
