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Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Prenatal cocaine/polydrug exposure and infant performance on an executive functioning task
Julia S Noland1, Lynn T Singer, Sudhir K Mehta
1Department of Pediatrics and General Medical Sciences, Case Western Reserve University, USA. jsn4@po.cwru.edu
Insights
Infants exposed to higher levels of prenatal cocaine showed deficits in executive function, specifically in the A-not-B task. These findings suggest potential long-term cognitive impacts of prenatal cocaine exposure.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Prenatal exposure to substances like cocaine can impact infant development.
- Executive functioning skills begin to emerge in infancy.
- Polydrug exposure (marijuana, alcohol, tobacco) often co-occurs with cocaine use.
Purpose of the Study:
- To assess executive functioning in cocaine-exposed (CE) infants compared to controls.
- To investigate the impact of heavier prenatal cocaine exposure on infant cognitive and motor development.
- To explore potential mediators and confounders in the relationship between prenatal cocaine exposure and infant development.
Main Methods:
- Assessed executive functioning using an A-not-B task in infants aged 9.5-12.5 months.
- Compared heavier-CE infants to lighter-CE and non-CE infants.
- Analyzed covariates including socioeconomic status, gestational age, birth weight, and other substance exposures.
Main Results:
- No overall difference in executive functioning between all CE and non-CE infants.
- Heavier-CE infants showed significant differences in A-not-B performance and global development tests.
- Gestational length mediated motor development; cigarette use confounded mental development.
- A-not-B performance remained significant after controlling for some variables but not global mental development.
Conclusions:
- Heavier prenatal cocaine exposure is associated with specific executive functioning deficits (A-not-B task) in infancy.
- While some developmental impacts are mediated or confounded by other factors, A-not-B performance shows a robust association.
- Findings highlight the importance of considering dose-dependent effects and co-exposures in prenatal substance research.
Abstract:
Executive functioning in cocaine/polydrug (marijuana, alcohol, tobacco) exposed infants was assessed in a single session, occurring between 9.5 and 12.5 months of age. In an A-not-B task, infants searched, after performance-adjusted delays, for an object hidden in a new location. Overall, the cocaine-exposed (CE) infants did not differ from non-CE controls recruited from the same at-risk population. However, comparison of heavier-CE (n = 9) to the combined group of lighter-CE (n = 10) and non-CE (n = 32) infants revealed significant differences on A-not-B performance, as well as on global tests of mental and motor development. Covariates investigated included socioeconomic status, marital status, race, maternal age, years of education, weeks of gestation, birth weight, as well as severity of prenatal marijuana, alcohol, and tobacco exposure. The relationship of heavier-CE status to motor development was mediated by length of gestation, and the relationship of heavier-CE status to mental development was confounded with maternal gestational use of cigarettes. The relationship of heavier-CE status to A-not-B performance remained significant after controlling for potentially confounded variables and mediators, but was not statistically significant after controlling for the variance associated with global mental development.
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