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Preschool externalizing behavior predicts gender-specific variation in adolescent neural structure.

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Early externalizing behaviors in boys are linked to smaller adolescent amygdala volume. This longitudinal study also found reduced angular gyrus and temporoparietal junction volume in children with high externalizing behaviors.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Psychopathology

Background:

  • Prefrontal cortex, amygdala, and hippocampus dysfunction are implicated in psychopathology.
  • Limited longitudinal data exist linking early behavior to later neural structure.

Purpose of the Study:

  • To investigate the relationship between early externalizing behavior and adolescent brain structure.
  • To examine amygdala, hippocampus, and prefrontal cortex volumes in relation to preschool externalizing behaviors.

Main Methods:

  • Longitudinal study of 76 adolescents followed since pregnancy.
  • Assessed preschool externalizing behavior and adolescent brain structure (amygdala, hippocampus, prefrontal cortex) at age 15.
  • Controlled for anxiety, maternal stress, later behaviors, and substance use.

Main Results:

  • Males with higher early externalizing behavior showed smaller adolescent amygdala volume (gender-specific effect).
  • Higher early externalizing behavior correlated with smaller volumes in the angular gyrus and temporoparietal junction (cross-gender effect).
  • No significant associations were found for hippocampus or prefrontal cortex volumes.

Conclusions:

  • Early externalizing behavior predicts specific adolescent brain structural changes, notably in the amygdala for males.
  • Findings highlight the long-term neural correlates of early behavioral patterns.
  • Identifies potential neural markers for externalizing behaviors in childhood.