Prenatal exposure to air pollution and infant cognitive development using an eye-tracking visual paired-comparison...

Area of Science:

• Environmental Health
• Neuroscience
• Developmental Psychology

Background:

• Prenatal life is crucial for brain development.
• Limited research exists on prenatal air pollution's impact on infant cognition, with most studies using subjective assessments.
• Objective measures are needed to understand early neurodevelopmental effects of environmental exposures.

Purpose of the Study:

• To investigate the association between prenatal exposure to specific air pollutants and objective measures of infant cognitive development.
• To utilize eye-tracking technology for assessing infant recognition memory as an indicator of cognitive function.
• To identify critical windows of vulnerability during pregnancy for air pollution's neurodevelopmental effects.

Main Methods:

• Longitudinal study of 168 mother-child pairs from the Barcelona Life Study Cohort (BiSC).
• Assessment of prenatal exposure to nitrogen dioxide (NO2), black carbon (BC), PM2.5, and PM2.5-bound copper (Cu) and iron (Fe) using land-use regression (LUR) models.
• Cognitive performance measured at 6 and 18 months using an eye-tracking Visual Paired-Comparison (VPC) task assessing novelty preference for faces.

Main Results:

• Increased prenatal exposure to NO2, BC, PM2.5, Cu, and Fe was associated with decreased novelty preference in infants.
• A decrease in novelty preference was observed for each interquartile range increase in pollutants.
• Potential for stronger associations in male infants was suggested.

Conclusions:

• Prenatal exposure to common air pollutants negatively impacts infant cognitive development, specifically recognition memory.
• The prenatal period represents a sensitive window for air pollution's adverse effects on the developing brain.
• Eye-tracking offers a valuable, objective, and non-invasive method for early detection of neurodevelopmental impacts from environmental exposures.