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Unpredictable maternal behavior is associated with a blunted infant cortisol response

Amanda N Noroña-Zhou1,2, Alyssa Morgan2, Laura M Glynn3

  • 1Department of Psychology, University of Denver, Denver, CO, USA.

Developmental Psychobiology
|March 3, 2020
PubMed

Insights

Infant exposure to unpredictable maternal sensory signals blunts cortisol stress response. This finding highlights how caregiving patterns impact infant stress regulation and HPA axis function.

Area of Science:

  • Developmental Psychology
  • Neuroendocrinology
  • Maternal-Infant Interaction

Background:

  • Hypothalamic-pituitary-adrenal (HPA) axis dysregulation is linked to health issues.
  • Early-life adversity can alter cortisol responses to stress.
  • Maternal behavior patterns may influence infant stress reactivity.

Purpose of the Study:

  • To investigate the association between maternal behavior patterns and infant stress response.
  • To determine if unpredictable maternal sensory signals affect infant cortisol levels during a stressor.

Main Methods:

  • 102 mother-infant dyads participated in a longitudinal study.
  • Maternal sensory signal unpredictability (visual, auditory, tactile) was quantified using entropy rate during play.
  • Infant salivary cortisol was measured before and after a painful inoculation at 12 months.

Main Results:

  • Unpredictable maternal sensory signals were associated with a blunted infant cortisol response to pain.
  • This association remained significant after controlling for maternal sensitivity and psychological distress.

Conclusions:

  • Unpredictable maternal sensory signals represent a mechanism by which caregiving influences infant stress response systems.
  • Findings underscore the importance of consistent maternal signaling for healthy infant HPA axis development.
Abstract

Keywords:
HPA axisinfantparental care

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