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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
Iervolino, Alessandra C.; Hines, Melissa; Golombok, Susan E.; Rust, John; Plomin, Robert – Child Development, 2005
The genetic and environmental etiologies of sex-typed behavior were examined during the preschool years in a sample of 3,990 three- to four-year-old twin and nontwin sibling pairs. Results showed moderate genetic and significant shared environmental influence for boys and substantial genetic and moderate shared environmental influence for girls.…
Descriptors: Sex Role, Environmental Influences, Siblings, Twins
Walker, Sheila O.; Plomin, Robert – Educational Psychology, 2005
Despite a substantial body of research suggesting genetic influence on educationally relevant behavioural traits, it is not clear how the nature-nurture question is perceived by teachers. In order to answer this question, we surveyed 667 UK primary school teachers, and for comparison also surveyed 1,340 parents about their perceptions of genetic…
Descriptors: Teacher Attitudes, Parent Attitudes, Learning Problems, Environmental Influences
Ronald, Angelica; Happe, Francesca; Price, Thomas S.; Baron-Cohen, Simon; Plomin, Robert – Journal of the American Academy of Child and Adolescent Psychiatry, 2006
Objective: To investigate children selected from a community sample for showing extreme autistic-like traits and to assess the degree to which these individual traits--social impairments (SIs), communication impairments (CIs), and restricted repetitive behaviors and interests (RRBIs)--are caused by genes and environments, whether all of them are…
Descriptors: Genetics, Asperger Syndrome, Autism, Interpersonal Competence
