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Published on: June 18, 2014
Effects of an Early Family Intervention on Children's Memory: The Mediating Effects of Cortisol Levels
Daphne Blunt Bugental1, Alex Schwartz, Colleen Lynch
1University of California, Santa Barbara.
Insights
Early intervention programs can positively impact infant stress responses and cognitive development. Maternal participation in a cognitive program led to lower infant cortisol levels, predicting better verbal short-term memory in children.
Area of Science:
- Developmental psychology
- Pediatric health
- Neuroendocrinology
Background:
- Early adversity poses risks to children's long-term developmental outcomes.
- The Hypothalamic-Pituitary-Adrenal (HPA) axis is a key stress response system sensitive to early life experiences.
- Understanding interventions that mitigate early life stress is crucial for child development.
Purpose of the Study:
- To examine the effect of a novel cognitive home visitation program on infant HPA axis activity.
- To investigate the mediating role of maternal behavior in the intervention's impact on infant stress.
- To determine if early hormonal changes predict later cognitive outcomes in at-risk infants.
Main Methods:
- Medically at-risk infants' HPA axis activity was measured.
- Mothers participated in either a cognitive intervention or a Healthy Start program.
- Maternal avoidance/withdrawal and infant cortisol levels were assessed, along with child verbal short-term memory at age 3.
Main Results:
- Maternal participation in the cognitive intervention predicted lower basal cortisol levels in infants.
- Reduced maternal avoidance/withdrawal mediated the relationship between the intervention and lower infant cortisol.
- Lower infant cortisol levels were associated with higher verbal short-term memory at age 3.
Conclusions:
- Cognitively-based home visitation programs can beneficially modulate infant stress physiology.
- Early intervention-induced hormonal changes may positively influence cognitive development, specifically verbal short-term memory.
- Findings highlight a pathway linking early intervention, HPA axis regulation, and later learning outcomes.
Abstract:
Developmental psychologists have long been concerned with the ways that early adversity influences children's long-term outcomes. In the current study, activity of the HPA axis of medically at-risk (e.g., preterm) infants was measured as a result of maternal participation in a novel cognitively-based home visitation program (versus a Healthy Start home visitation program). Maternal participation in the cognitive intervention predicted lower basal cortisol levels among infants - with reduced levels of maternal avoidance/withdrawal serving as a mediator of this relation. Lower cortisol levels in infancy, in turn, predicted higher verbal short-term memory at age 3. Short-term memory represents a cognitive ability that has importance for children's later educational outcomes. Findings provide experimental evidence concerning the pathway by which an early intervention may produce hormonal changes that can, in turn, influence children's learning outcomes.
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