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Asbury, Kathryn; Moran, Nicola; Plomin, Robert – AERA Open, 2016
Twin studies find ~20% of the variance in achievement in public examinations taken at age 16 in the United Kingdom can be explained by experiences not shared within families. Nonshared environmental (NSE) influences, including measurement error, explain why monozygotic (MZ) twins differ from each other. Such influences work independently of…
Descriptors: Environmental Influences, Academic Achievement, Adolescents, Twins
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

Plomin, Robert; And Others – Journal of Research in Personality, 1981
Twin children were videotaped hitting an inflated clown figure. Three behaviors (number of hits, intensity of hits, and number of quadrants hit) showed adequate response characteristics, rater reliability, and test-retest reliability. Twin analyses of the three behavioral ratings yielded no evidence of hereditary influence. (Author)
Descriptors: Aggression, Behavior Patterns, Children, Family Influence