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Related Experiment Videos

Using MZ differences in the search for nonshared environmental effects

A Pike1, D Reiss, E M Hetherington

  • 1Institute of Psychiatry, London, U.K.

Journal of Child Psychology and Psychiatry, and Allied Disciplines
|September 1, 1996
PubMed
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Parental negativity influences adolescent antisocial behavior, even in genetically identical twins. This research identifies specific environmental factors contributing to individual differences in children.

Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Family Studies

Background:

  • Behavioral genetic studies indicate environmental influences on individual differences are primarily nonshared.
  • Specific nonshared environmental factors remain largely unidentified.
  • Identical twins (MZ) offer a unique model to study nonshared environmental influences, controlling for genetic variation.

Purpose of the Study:

  • To investigate specific nonshared environmental influences on adolescent adjustment.
  • To examine the relationship between parental negativity and antisocial behavior in genetically identical twins.
  • To differentiate between within-reporter and between-reporter associations.

Main Methods:

  • Utilized data from 93 pairs of identical twins (aged 10-18) from the Nonshared Environment and Adolescent Development (NEAD) project.

Related Experiment Videos

  • Collected reports on parental negativity and adolescent adjustment from parents and adolescents.
  • Included observational ratings from videotaped interactions.

    • Main Results:

    • Within-pair differences in maternal and paternal negativity significantly correlated with within-pair differences in adolescent antisocial behavior.
    • Moderate correlations were found for within-reporter associations.
    • Negligible correlations were observed for between-reporter associations.

    Conclusions:

    • Parental negativity emerges as a specific nonshared environmental factor linked to adolescent antisocial behavior.
    • Findings highlight the importance of considering the reporter's perspective in understanding environmental influences.
    • Identical twin designs are effective for isolating environmental effects on behavior.