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Chronic Social Defeat Stress in Early Adolescent Male Mice
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Aggressive-antisocial boys develop into physically strong young men.

Joshua D Isen1, Matthew K McGue2, William G Iacono2

  • 1University of Minnesota, Minneapolis jdisen@umn.edu.

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Summary
This summary is machine-generated.

Antisocial tendencies in childhood predict increased physical strength in adolescent boys, challenging the idea that strength causes aggression. This developmental finding supports sexual selection theory in human males.

Keywords:
adolescent developmentaggressionantisocial behaviorphysical strength

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Area of Science:

  • Developmental Psychology
  • Evolutionary Biology
  • Human Behavior

Background:

  • Superior upper-body strength in young men correlates with aggression.
  • Traditionally, physical strength is seen as causing aggressive behavior.
  • This study examines the developmental relationship between strength and aggression.

Purpose of the Study:

  • To investigate the developmental trajectory of physical strength and antisocial tendencies in males.
  • To determine if antisocial behavior precedes or follows the development of physical formidability.
  • To test predictions derived from sexual selection theory.

Main Methods:

  • Utilized two longitudinal cohorts of children.
  • Estimated adolescent change in upper-body strength using latent growth models.
  • Analyzed the temporal precedence of antisocial tendencies and physical strength.

Main Results:

  • Males' antisocial tendencies in childhood temporally precede their physical formidability.
  • Boys with higher childhood antisocial tendencies showed greater increases in physical strength from ages 11 to 17.
  • No such relationship was observed in girls.

Conclusions:

  • Antisocial behavior may influence the development of physical strength in adolescent males.
  • Findings support sexual selection theory by suggesting an adaptive link between male behavior and physical masculinization.
  • Challenges the traditional view of physical strength as a direct cause of aggression.