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Low-level lead exposure and contingency-based responding in preschoolers: an exploratory study
Melanie McDiarmid Nelson1, Kimberly Andrews Espy
1Department of Pediatrics, Section of Developmental and Behavioral Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, USA. melanie-nelson@ouhsc.edu
Developmental Neuropsychology
|February 26, 2010
Summary
Preschool children exposed to low-level lead (Pb) take longer to learn associations. This study adapted primate reversal tasks to assess cognitive functions in children with varying blood lead levels (BLL).
Area of Science:
- Neuroscience
- Developmental Psychology
- Environmental Health
Background:
- Lead exposure in early childhood is a significant public health concern.
- Even low-level lead exposure (BLL) has been linked to cognitive deficits.
- Assessing specific cognitive functions affected by lead is crucial for understanding its impact.
Purpose of the Study:
- To adapt primate-based reversal learning tasks for preschool children.
- To investigate the effects of low-level lead exposure on cognitive flexibility and learning in preschoolers.
- To determine if observed differences in learning are due to distractibility or perseveration.
Main Methods:
- Utilized two reversal learning tasks (spatial and spatial with irrelevant color cues).
- Administered tasks to 139 preschool children categorized by blood lead levels (BLL): >=5 microg/dl (n=69) and <5 microg/dl (n=70).
- Analyzed learning rates and compared performance between groups, controlling for distractibility and perseveration.
Main Results:
- Preschool children with higher BLL (>=5 microg/dl) demonstrated slower learning acquisition compared to those with lower BLL (<5 microg/dl).
- The observed learning differences were not attributable to increased distractibility or perseverative responding in the higher BLL group.
- The adapted reversal tasks proved sensitive to cognitive differences associated with low-level lead exposure.
Conclusions:
- Low-level lead exposure in preschool children impairs associative learning.
- Reversal learning tasks are effective tools for assessing specific cognitive deficits in young children related to environmental toxins.
- Findings underscore the importance of minimizing lead exposure during early development for optimal cognitive outcomes.
