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Bellinger, David C.; Matthews-Bellinger, Julia A.; Kordas, Katarzyna
Environment international, September 2016, 2016-Sep, 2016-09-00, 20160901, Volume: 94Journal Article
Studies of early-life neurotoxicant exposure have not been designed, analyzed, or interpreted in the context of a fully developmental perspective. The goal of this paper is to describe the key principles of a developmental perspective and to use examples from the literature to illustrate the relevance of these principles to early-life neurotoxicant exposures. Four principles are discussed: 1) the effects of early-life neurotoxicant exposure depend on a child's developmental context; 2) deficits caused by early-life exposure initiate developmental cascades that can lead to pathologies that differ from those observed initially; 3) early-life neurotoxicant exposure has intra-familial and intergenerational impacts; 4) the impacts of early-life neurotoxicant exposure influence a child's ability to respond to future insults. The first principle is supported by considerable evidence, but the other three have received much less attention. Incorporating a developmental perspective in studies of early-life neurotoxicant exposures requires prospective collection of data on a larger array of covariates than usually considered, using analytical approaches that acknowledge the transactional processes between a child and the environment and the phenomenon of developmental cascades. Consideration of early-life neurotoxicant exposure within a developmental perspective reveals that many issues remain to be explicated if we are to achieve a deep understanding of the societal health burden associated with early-life neurotoxicant exposures. •Studies of neurotoxicant exposures have not employed a developmental perspective.•Studies must be designed and analyzed to assess contextual effects on toxicity.•Studies must recognize the phenomenon of developmental cascades.•Studies must acknowledge the transactional nature of early child development.•Health burden will be underestimated if a developmental perspective is not employed.
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