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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Public Health

Background:

  • Racial discrimination is a significant stressor for minority youth, contributing to health disparities.
  • Chronic stress from discrimination can negatively affect brain development and mental health.
  • Understanding the neurobiological pathways is crucial for addressing these disparities.

Purpose of the Study:

  • To examine the neurobiological mechanisms linking perceived racial discrimination to mental and behavioral health outcomes in racial/ethnic minority youth.
  • To investigate how discrimination affects brain development, specifically resting-state functional connectivity in subcortical regions and large-scale brain networks.
  • To determine if brain changes mediate sex-specific effects on internalizing or externalizing symptoms.

Main Methods:

  • Analysis of data from 3,321 racial/ethnic minority youth in the Adolescent Brain Cognitive Development (ABCD) Study.
  • Utilized propensity score-weighted machine learning to assess discrimination's effects on brain connectivity over two years.
  • Employed mediation analyses to evaluate sex-specific impacts on internalizing/externalizing symptoms.

Main Results:

  • Perceived discrimination was linked to significant 2-year changes in the connectivity of the nucleus accumbens, amygdala, and hippocampus.
  • Observed decreased connectivity in the nucleus accumbens and amygdala, and increased hippocampal connectivity, suggesting accelerated maturation.
  • Found sex differences: discrimination-related nucleus accumbens changes correlated with internalizing symptoms in females.

Conclusions:

  • Perceived racial discrimination in adolescence influences subcortical-cortical brain development.
  • These neurobiological changes impact mental and behavioral health outcomes.
  • The effects of discrimination on brain development and subsequent mental health are sex-specific.