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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
Martin, Neilson C.; Levy, Florence; Pieka, Jan; Hay, David A. – International Journal of Disability, Development & Education, 2006
Attention Deficit Hyperactivity Disorder (ADHD) commonly co-occurs with Oppositional Defiant Disorder, Conduct Disorder and Reading Disability. Twin studies are an important approach to understanding and modelling potential causes of such comorbidity. Univariate and bivariate genetic models were fitted to maternal report data from 2040 families of…
Descriptors: Twins, Foreign Countries, Genetics, Attention Deficit Disorders
Peer reviewedShopen, Glenda; Shopen, Tim – Australian Journal of Early Childhood, 1995
Examines the case of two five-year-old twin boys with delayed language development, yet judged to be articulate and successful students in kindergarten. Suggests that the delay appeared because most of their interaction had been with each other. However, through their family they became acquainted with the discourse activities that are valued at…
Descriptors: Case Studies, Child Development, Delayed Speech, Family Environment
