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Exploring the Association between Anxiety and Conduct Problems in a Large Sample of Twins Aged 2-4
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Gregory, Alice M.; Eley, Thalia C.; Plomin, Robert – Journal of Abnormal Child Psychology, 2004
Anxiety and conduct problems covary, yet studies have not explored the genetic and environmental origins of this association. We analyzed parent-reported anxiety and conduct problems in 6,783 pairs of twins at 2-, 3-, and 4-years of age. As anxiety and conduct problems were fairly stable across the three ages (average 1-year correlation was .53),…
Descriptors: Females, Males, Genetics, Anxiety
Genetic and Environmental Origins of Verbal and Performance Components of Cognitive Delay in 2-Year-Olds.
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Eley, Thalia C.; And Others – Developmental Psychology, 1999
Investigated the etiology of several measures of cognitive delay in over 3,000 pairs of 2-year-old twins, focusing on group-differences heritability for general and specific cognitive delays. Concluded that because the genetic and environmental origins of verbal and performance delays in infancy differ, they are better considered separately rather…
Descriptors: Cognitive Ability, Cognitive Development, Developmental Delays, Etiology
Sex Differences in the Etiology of Aggressive and Nonaggressive Antisocial Behavior: Results from Two Twin Studies.
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Eley, Thalia C.; Lichtenstein, Paul; Stevenson, Jim – Child Development, 1999
Parents of Swedish twin pairs ages 7 to 9 years and of British twin pairs ages 8 to 16 years completed the Child Behavior Checklist. Found that genetic factors influenced aggressive antisocial behavior to a greater extent than nonaggressive antisocial behavior, which was also significantly influenced by the shared environment. There was a…
Descriptors: Adolescents, Aggression, Antisocial Behavior, Behavior Problems
Genetic and Environmental Covariation between Verbal and Nonverbal Cognitive Development in Infancy.
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Price, Thomas S.; Eley, Thalia C.; Dale, Philip S.; Stevenson, Jim; Plomin, Robert – Child Development, 2000
Examined infant verbal and nonverbal cognitive development for 1,937 pairs of same-sex 2-year-old twins. Found that verbal and nonverbal development correlated .42. Genetic factors were responsible for less than half of this phenotypic correlation. The genetic correlation between verbal and nonverbal abilities was only .30, suggesting that genetic…
Descriptors: Cognitive Development, Cognitive Processes, Infants, Nature Nurture Controversy
The Structure of Language Abilities at 4 Years: A Twin Study.
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Colledge, Essi; Bishop, Dorothy V.M.; Koeppen-Schomerus, Gesina; Price, Thomas S.; Happe, Francesca G.E.; Eley, Thalia C.; Dale, Philip S.; Plomin, Robert – Developmental Psychology, 2002
Language development was studied in 310 pairs of 4-year-old twins. Rotated factor analyses indicated presence of a general language factor (L) and a general nonverbal factor (NV). Moderate genetic influence was found for L and NV abilities. Bivariate genetic analysis estimated a genetic correlation of .63 between L and NV abilities. Results…
Descriptors: Cognitive Development, Factor Analysis, Individual Differences, Language Acquisition