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Origins of Individual Differences in Imitation: Links with Language, Pretend Play, and Socially Insightful Behavior in Two-Year-Old Twins
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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
Nature, Nurture and Academic Achievement: A Twin Study of Teacher Assessments of 7-year-olds
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Walker, Sheila O.; Petrill, Stephen A.; Spinath, Frank M.; Plomin, Robert – British Journal of Educational Psychology, 2004
Background: Twin research has consistently shown substantial genetic influence on individual differences in cognitive ability; however, much less is known about the genetic and environmental aetiologies of school achievement. Aims: Our goal is to test the hypotheses that teacher-assessed achievement in the early school years shows substantial…
Descriptors: Teaching Methods, Foreign Countries, Environmental Influences, Cognitive Ability