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Heredity2
Infants2
Sex Differences2
Twins2
Age Differences1
Empathy1
Inhibition1
Longitudinal Studies1
Prosocial Behavior1
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Developmental Psychology2
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Robinson, JoAnn L.1
Zahn-Waxler, Carolyn1
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The Heritability of Inhibited and Uninhibited Behavior: A Twin Study.
Peer reviewed Peer reviewed
Robinson, JoAnn L.; And Others – Developmental Psychology, 1992
Behaviors of monozygotic and dizygotic twins that were indicative of wariness were observed when the twins were 14, 20, and 24 months of age. An index of inhibition constructed from observations showed internal consistency at all ages and stability across ages. Heritability was a factor at all ages. (BC)
Descriptors: Heredity, Infants, Inhibition, Longitudinal Studies
The Development of Empathy in Twins.
Peer reviewed Peer reviewed
Zahn-Waxler, Carolyn; And Others – Developmental Psychology, 1992
Observational measures of monozygotic and dizygotic twins' reactions to simulations of distress in others were obtained when the twins were 14 and 20 months old. Components of concern for others increased with age. Girls scored higher than boys on most measures. There was modest evidence for heritability of empathy. (BC)
Descriptors: Age Differences, Empathy, Heredity, Infants