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Related Experiment Videos

Social development of twins.

Lisabeth Fisher DiLalla1

  • 1Family and Community Medicine, Southern Illinois University School of Medicine, Carbondale, Illinois 62901, USA. ldilalla@siu.edu

Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies
|April 14, 2006
PubMed
Summary

Twins showed fewer prosocial behaviors with unfamiliar peers in early childhood. However, adolescent twins were rated as more aggressive by parents, suggesting potential risks for social interactions.

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Area of Science:

  • Developmental Psychology
  • Behavioral Science
  • Twin Studies

Background:

  • Understanding the social development of twins compared to singletons is crucial.
  • Two hypotheses exist: twins are more prosocial due to a peer, or less prosocial due to comfort with similar individuals.

Purpose of the Study:

  • To compare prosocial and aggressive behaviors in twins and singletons.
  • To investigate developmental trajectories of social behaviors in twins.

Main Methods:

  • Study 1: Observed 5-year-old twins and singletons interacting with unfamiliar peers.
  • Study 2: Parent-reported prosocial and aggressive behaviors of 10- to 15-year-old twins and singletons.

Main Results:

  • Five-year-old twins exhibited less prosocial behavior but not more aggression than singletons.

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  • Adolescent twins were rated as more aggressive by parents, with no significant difference in prosocial behavior.
  • Early prosocial deficits in twins were not consistently reported by parents in adolescence.

    • Conclusions:

    • Twins may display fewer prosocial behaviors with unfamiliar peers in early childhood.
    • Adolescent twins show higher parental ratings of aggression.
    • These findings suggest twins might be at risk for social interaction challenges in childhood and adolescence.