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The emergence and evolution of infant externalizing behavior.

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Externalizing behaviors, including aggression and defiance, form a cohesive construct in infants as early as 8 months. This early development shows stability and links to family factors.

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Area of Science:

  • Developmental Psychology
  • Child Psychology
  • Behavioral Science

Background:

  • Externalizing behaviors in infants are complex and require investigation into their developmental trajectory.
  • Understanding the emergence of these behaviors is crucial for early intervention and support.

Purpose of the Study:

  • To examine the developmental viability of the externalizing behavior construct from 8 to 24 months of infant age.
  • To determine if early infant behaviors form a single, underlying construct and assess its stability and predictive associations.

Main Methods:

  • Longitudinal study of 274 couples from childbirth to 24 months.
  • Mothers and fathers completed questionnaires on infant physical aggression, defiance, activity, and distress at 8, 15, and 24 months.

Main Results:

  • Infant physical aggression, defiance, activity, and distress formed a single externalizing behavior factor.
  • This construct demonstrated longitudinal stability, with increasing stability of aggression and defiance over time.
  • Externalizing behaviors were associated with interparental conflict and poor parent-infant bonding.

Conclusions:

  • The externalizing behavior construct is psychologically meaningful by 8 months of infant age.
  • Researchers should consider earlier developmental periods when studying the emergence of externalizing behaviors.