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The Influence of Neighborhood on Infant Parasympathetic Nervous System Development.

Marisa N Lytle1, Anna M Zhou2,3, Elizabeth Youatt1

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Neighborhood environments directly impact infant stress response system development, but not through maternal depression. This research explores broader environmental influences on early life physiological regulation.

Keywords:
infancymaternal depressionneighborhoodrespiratory sinus arrhythmiasocial support

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Area of Science:

  • Developmental psychology
  • Environmental health
  • Neuroscience

Background:

  • The adaptive calibration model (ACM) posits that the stress response system, including the parasympathetic nervous system (PNS), adapts to environmental contexts.
  • Parental factors like maternal depression influence infant stress response, but the impact of broader neighborhood environments is less understood.

Purpose of the Study:

  • To investigate the relationship between neighborhood structural disadvantage, maternal depressive symptoms, and infant parasympathetic nervous system (PNS) development.
  • To examine whether maternal depressive symptoms mediate the effect of neighborhood environment on infant PNS development.

Main Methods:

  • Latent growth curve modeling and moderated mediation analysis were used with data from 320 mother-infant dyads.
  • Infant resting respiratory sinus arrhythmia (RSA), a marker of PNS activity, was assessed at 4, 8, 12, 18, and 24 months.

Main Results:

  • Maternal depressive symptoms generally decreased, while infant RSA generally increased across the first two years.
  • Neighborhood structural disadvantage had a direct effect on initial infant RSA levels.
  • Maternal depressive symptoms did not significantly mediate the relationship between neighborhood disadvantage and infant RSA trajectories.

Conclusions:

  • Broader neighborhood environments can directly influence the development of the infant stress response system.
  • The pathways through which neighborhoods affect infant PNS development may extend beyond maternal depressive symptoms.