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Maternal blood lead effects on infant intelligence at age 7 months
Eugene Emory1, Zehra Ansari, Roland Pattillo
1Center for Prenatal Assessment and Human Development, Emory University, Atlanta, Ga., USA.
Insights
Even low maternal blood lead levels can negatively impact infant memory and cognitive development. Higher novelty preference scores in infants correlated with lower lead exposure, suggesting a protective effect.
Area of Science:
- Environmental Health
- Developmental Psychology
- Pediatrics
Background:
- Maternal blood lead levels are a known environmental risk factor for child development.
- Previous research suggests a link between lead exposure and adverse neurodevelopmental outcomes.
- The impact of very low lead exposure levels on infant cognition requires further investigation.
Purpose of the Study:
- To examine the association between low-level maternal blood lead exposure and cognitive functioning in African-American infants.
- To assess the relationship between novelty preference scores on the Fagan test and maternal lead levels.
Main Methods:
- Utilized the Fagan test of Infant Intelligence to assess cognitive abilities in 7-month-old infants.
- Analyzed maternal blood lead levels, focusing on levels below 5 microg/dL.
- Correlated infant novelty preference scores with maternal blood lead concentrations.
Main Results:
- Infants exposed to lower maternal blood lead levels demonstrated better performance on cognitive assessments.
- A significant inverse relationship was observed between novelty preference scores and maternal lead levels.
- No infant with high novelty preference scores exhibited high maternal blood lead levels.
Conclusions:
- Low-level maternal lead exposure, even below 5 microg/dL, can adversely affect infant cognitive development and memory.
- Novelty preference may serve as an indicator of cognitive resilience in the context of lead exposure.
- Findings underscore the importance of minimizing lead exposure during pregnancy for optimal infant neurodevelopment.
Abstract:
A sample of 7-month-old African-American infants, exposed to maternal blood lead levels less than 5 microg/dL, were assessed with the Fagan test of Infant Intelligence. The results indicate significant effects on memory and cognitive functioning. Specifically, infants who scored in the upper 5th to 15th percentile of novelty preference scores had lower lead values than those scoring in the lower 5th or 15th percentile. Of note, is the finding that no infant who scored in the upper percentile range was ever classified as having high maternal blood lead levels. These results are in accord with previous studies that report relationships between low-level lead exposure and nonoptimal infant development.