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Sex-specific developmental changes in amygdala responses to affective faces.

W D Killgore1, M Oki, D A Yurgelun-Todd

  • 1Cognitive Neuroimaging Laboratory, McLean Hospital/Harvard Medical School, Belmont, MA 02478, USA.

Neuroreport
|February 24, 2001
PubMed
Summary

Adolescent brain development shows sex differences in emotional regulation. Females exhibit increased prefrontal cortex activity relative to the amygdala with age, unlike males, suggesting distinct maturation pathways for self-control.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Neuroscience

Background:

  • Adolescent development involves brain changes, particularly in self-control and emotional regulation.
  • Cerebral function shifts from subcortical to prefrontal cortex regions during maturation.
  • Hormonal changes may influence sex-specific developmental trajectories.

Purpose of the Study:

  • To investigate sex differences in the functional maturation of affective processing during adolescence.
  • To examine the developmental interplay between amygdala and prefrontal cortex activation in response to emotional stimuli.
  • To explore the role of sex-specific hormonal changes in moderating these neural developments.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to assess brain activity.

Related Experiment Videos

  • Participants viewed photographs of faces expressing fear to elicit affective responses.
  • Nineteen children and adolescents were included in the study, with analysis of age-related changes.

    • Main Results:

    • Significant sex differences were observed in the pattern of amygdala and prefrontal cortex activation.
    • Females demonstrated a progressive increase in left hemisphere prefrontal relative to amygdala activation with age.
    • Males did not exhibit a significant age-related difference in this prefrontal-amygdala activation pattern.

    Conclusions:

    • Adolescent functional brain maturation in affect-related circuits differs between sexes.
    • These findings suggest distinct developmental trajectories for emotional self-regulation in males and females.
    • The prefrontal-amygdala circuit's maturation is influenced by sex-specific factors during adolescence.