Abstract
Background
Childhood lead [Pb] exposure has been consistently linked to neurotoxic effects related to the prefrontal cortex, a critical mediating structure involved in decision-making, planning, problem-solving, and specific aspects of short-term memory, i.e., the components of executive functions [EFs]. Limited studies have taken a deeper phenotyping approach that assess Pb’s effects across multiple EF dimensions simultaneously, which can be organized into hot [e.g., reward, motivation] and cold [e.g., primary cognitive processing] dimensions.
Objective
We investigated whether childhood Pb exposure affects hot and cold EF dimensions and assessed any sexually dimorphic effects.
Methods
Leveraging a longitudinal birth cohort based in Mexico City, children’s (n = 602) whole blood Pb levels (mean 23.66 μg/L) were measured at ages 4–6 and they were administered several EF tasks at ages 6–9. Confirmatory factor analysis confirmed that six EF tests estimated two latent variables representing hot and cold EF dimensions. Structural equation modeling [SEM] estimated the neurotoxic effect of childhood Pb exposure on latent variables of hot [higher scores indicate improved performance] and cold [higher scores indicate poorer performance] EFs. Subsequently, a multi-group SEM explored potential effect modifications by child sex.
Results
Pb exposure was significantly associated with negative impacts on hot EF performance [b = −0.129, p = 0.004]. In both males (b = −0.128, p = 0.032) and females (b = −0.132, p = 0.027), childhood Pb exposure was significantly associated with a reduction in hot EF performance, with no evidence of an interaction with sex. Additionally, we found no association between Pb exposure and cold EF performance [b = 0.063, p = 0.392] and no notable sex differences.
Impact
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The present study leverages a sophisticated SEM framework as an exploratory tool and a neurotoxic framework to analyze multidimensional cognitive data, aiming to delineate hot and cold EFs. Our findings are consistent with neurotoxicity secondary to childhood Pb exposure impacting hot EF performance more than cold EF, though comparable trends were noted in cold EF performance for both sexes. Our approach uniquely captures hot EF, the more emotional and self-regulatory aspect of EF, adding a novel dimension to the literature on Pb exposure and cognitive development.
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Data availability
All other data are available upon request to robert.wright@mssm.edu.
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Acknowledgements
The authors would like to acknowledge the entire PROGRESS study team, as well as the participants.
Funding
Research funding was provided in part by NIH grants: T32HD049311, K99ES036277; R01ES014930, R01ES013744, R24ES028522, P30ES023515, R01ES026033, R01MH122447, R01ES029511, R01ES028927, R03ES033374, and K25HD104918.
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JML: Conceptualization, methodology, formal analysis, data interpretation, writing – original draft, writing – review & editing, Visualization. SHL: Supervision, methodology, data interpretation, writing – review & editing. VM, CSA, and SE: Writing – review & editing. SMM: Project administration, data curation. MKH and RFW: Writing – review & editing, review of final draft. MMTR: Investigation, resources, project administration, data curation, writing – review & editing. ROW: Investigation, resources, supervision, project administration, funding acquisition, writing – review & editing, review of final draft.
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The study adheres to approved protocols from the institutional review boards of the Icahn School of Medicine at Mount Sinai [IRB protocol number: 12-00751A], and all three committees [Research, Ethics in Research, and Biosafety] were included in the IRB at the National Institute of Public Health in Cuernavaca, Mexico. Informed written consent was obtained from all participants during the first visit and all methods were performed in accordance with the relevant guidelines and regulations.
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Lane, J.M., Liu, S.H., Midya, V. et al. Childhood Pb-induced cognitive dysfunction: structural equation modeling of hot and cold executive functions. J Expo Sci Environ Epidemiol 35, 715–724 (2025). https://doi.org/10.1038/s41370-025-00761-7
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DOI: https://doi.org/10.1038/s41370-025-00761-7