Cortisol reactivity and negative affect among preterm infants at 12 months during a mother-infant interaction task

Area of Science:

• Developmental Psychology
• Pediatric Endocrinology
• Maternal-Infant Interaction Studies

Background:

• Preterm (PT) infants exhibit altered stress responses and regulatory challenges.
• Understanding factors influencing PT infant's cortisol reactivity is crucial for early intervention.
• Mother-infant interaction is a key environmental factor in early development.

Purpose of the Study:

• To examine correlates of cortisol reactivity in preterm infants during a mother-infant interaction.
• To investigate the association between cortisol reactivity, negative affect, and maternal behaviors in PT infants.
• To explore the influence of neonatal and environmental factors on PT infant's stress regulation.

Main Methods:

• Assessed 48 preterm infants (corrected age 12 months) and their mothers.
• Utilized a standardized mother-infant interaction task to measure infant negative affect and maternal behaviors (sensitivity, intrusiveness).
• Collected infant saliva samples pre- and post-interaction to measure cortisol reactivity.

Main Results:

• Cortisol decrease was initially associated with sensitive maternal behaviors and less intrusiveness.
• These associations became non-significant after controlling for neonatal risk, family SES, and maternal distress.
• Maternal intrusiveness was the sole significant predictor of infant negative affect.

Conclusions:

• Early relational experiences, particularly maternal behavior, are vital for preterm infants' regulatory development.
• The initial findings on cortisol reactivity require careful interpretation due to confounding neonatal and environmental variables.
• Maternal intrusiveness is a key factor impacting preterm infants' emotional regulation during interactions.