Adversity in Infancy and Childhood Cognitive Development: Evidence From Four Developing Countries

Area of Science:

• Child Development
• Cognitive Psychology
• Global Health

Background:

• Early life adversities are a significant concern in developing countries.
• Understanding the long-term cognitive impact of these adversities is crucial for public health.
• Longitudinal data from diverse populations are needed to assess these effects.

Purpose of the Study:

• To investigate the association between adverse experiences at age 1 (AE-1) and cognitive development in childhood.
• To examine the effect of AE-1 on cognitive levels and change over time.
• To utilize harmonized data from four developing countries for robust analysis.

Main Methods:

• Longitudinal study design using data from the Young Lives study (Ethiopia, India, Peru, Vietnam).
• Cognitive function assessed using the Peabody Picture Vocabulary Test (PPVT) at ages 5 and 8.
• Ordinary least squares regression analysis to estimate the impact of AE-1 on cognitive scores and change.

Main Results:

• Higher infant adversity scores were associated with lower cognitive scores at ages 5 and 8.
• Children with severe early adversities exhibited a smaller increase in cognition between ages 5 and 8.
• The negative association between early adversity and cognition was most pronounced in the Indian cohort.

Conclusions:

• Early life adversities have a detrimental effect on cognitive development throughout childhood.
• Findings highlight the need for timely interventions to mitigate the negative consequences of early life adversities.
• Policy implications focus on supporting vulnerable children to improve long-term cognitive outcomes.