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Direct linkLundstrom, Sebastian; Haworth, Claire M. A.; Carlstrom, Eva; Gillberg, Christopher; Mill, Jonathan; Rastam, Maria; Hultman, Christina M.; Ronald, Angelica; Anckarsater, Henrik; Plomin, Robert; Lichtenstein, Paul; Reichenberg, Abraham – Journal of Child Psychology and Psychiatry, 2010
Background: Despite extensive efforts, the causes of autism remain unknown. Advancing paternal age has been associated with various neurodevelopmental disorders. We aim to investigate three unresolved questions: (a) What is the association between paternal age and autism spectrum disorders (ASD)?; (b) Does paternal age moderate the genetic and…
Descriptors: Twins, Autism, Genetics, Foreign Countries
McEwen, Fiona; Happe, Francesca; Bolton, Patrick; Rijsdijk, Fruhling; Ronald, Angelica; Dworzynski, Katharina; Plomin, Robert – Child Development, 2007
Imitation, vocabulary, pretend play, and socially insightful behavior were investigated in 5,206 same- and opposite-sex 2-year-old twin pairs in the United Kingdom. Individual differences in imitative ability were due to modest heritability (30%), while environmental factors shared between twins (42%) and unique to each twin (28%) also made…
Descriptors: Foreign Countries, Teaching Methods, Twins, Play
