Genetic and Environmental Influences on the Junior Temperament and Character Inventory in a Preadolescent Twin Sample |
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Authors: | Joshua D Isen Laura A Baker Adrian Raine Serena Bezdjian |
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Institution: | (1) Department of Psychology, SGM 501, University of Southern California, Los Angeles, CA 90089-1061, USA;(2) Departments of Criminology, Psychiatry, and Psychology, University of Pennsylvania, Philadelphia, PA 19104-6286, USA;(3) Department of Psychiatry, Washington University in St. Louis, St. Louis, MO 63130-4899, USA |
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Abstract: | This study evaluated the genetic and environmental structure of personality variables from the Junior Temperament and Character
Inventory (JTCI), in 605 pairs of 9- and 10-year old twins. There is a paucity of information on the biometric structure of
temperament and character traits in preadolescent children. Latent factor models were fit to the subscales/items of each trait
as a method of estimating genetic and environmental effects on true score variance, especially since internal consistency
and reliability were moderate or low for some scales (particularly Reward Dependence and Persistence). Shared environmental
influences on Cooperativeness were substantial. Significant heritability estimates were obtained for Self-directedness and
Harm Avoidance, but not Novelty Seeking, Reward Dependence or Persistence. With the exception of Harm Avoidance, each of the
scales failed to show measurement invariance with respect to sex, suggesting these scales may differ in meaning for boys and
girls at this age.
Edited by Danielle Posthuma. |
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Keywords: | JTCI Personality Twins Preadolescence Measurement invariance |
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