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Vagal tone regulation during sustained attention in boys exposed to opiates in utero
J E Hickey1, P E Suess, D B Newlin
1Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA.
Insights
Children exposed to opiates in utero show impaired physiological responses to attention demands. Both opiate-exposed and environmentally exposed boys struggled with attention tasks, highlighting prenatal and postnatal influences.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Prenatal opiate exposure is linked to attention and learning issues in children.
- Previous studies faced challenges due to imprecise attention measures and inadequate control for postnatal factors.
Purpose of the Study:
- To precisely measure sustained attention in boys with prenatal opiate exposure.
- To differentiate in utero opiate effects from postnatal environmental influences on attention.
Main Methods:
- Utilized continuous-performance tasks and cardiac vagal tone (a physiological index of sustained attention).
- Compared three groups: boys prenatally exposed to opiates, boys with postnatal exposure, and non-drug-exposed controls.
- Measured vagal tone during delay, vigilance, and distractibility tasks.
Main Results:
- Opiate-exposed boys failed to suppress cardiac vagal tone when distractors were present (Distractibility task) compared to controls.
- Both opiate-exposed and environmentally exposed boys performed worse on the Distractibility task than non-drug-exposed controls.
- This suggests impaired physiological attention regulation in prenatally exposed boys and significant environmental impact.
Conclusions:
- Prenatal opiate exposure may impair physiological responses to increased attentional demand in school-aged boys.
- Environmental factors play a crucial role in attentional performance, as evidenced by the performance of the environmental control group.
- Future research should consider both prenatal and postnatal factors when assessing attention deficits in children.
Abstract:
Attention and learning problems among children exposed to opiates in utero have been previously reported but are difficult to interpret due to imprecise measurement and inadequate control of postnatal factors. In this study, we used a behavior-based measure of attention (continuous-performance tasks) and a physiological index of sustained attention (cardiac vagal tone) to measure more precisely the process of sustained attention. Boys, aged 7 to 12, exposed to opiates in utero, were compared to boys whose mothers began using illicit substances after the child's birth (environmental controls), and boys whose mothers were non-drug users. This three-group design was intended to isolate in utero effects from postnatal environmental influences. Vagal tone, a measure of heart-rate variability sensitive to vagal influences on the heart, was measured pre- and postbaseline and during the three tasks of the Gordon Diagnostic System (Delay, Vigilance, and Distractibility). Vagal tone has been found to be sensitive to changes in environmental demand for sustained attention in infants, school-age children, and adults. Results indicated that when distractors were added to the vigilance task (Distractibility task), opiate-exposed boys failed to suppress vagal tone compared to both control groups. However, both the opiate-exposed boys and the environmental controls made fewer correct responses than non-drug-exposed controls on this task. These results indicate that normal physiological responses to increased attentional demand may be impaired in boys exposed in utero to opiates in this age range. However, the poor Distractibility scores of both the opiate-exposed and environmental controls suggests an important role of environmental influences on attentional performance.