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Attentional response at eight weeks in prenatally drug-exposed and preterm infants
C D Coles1, K A Bard, K A Platzman
1Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA. ccoles@emory.edu
Insights
Prenatal polydrug exposure, particularly cocaine, impacts infant attention. Drug-exposed infants showed distress (accelerated heart rate) to social stimuli, unlike controls who focused (decelerated heart rate).
Area of Science:
- Developmental Psychology
- Neuroscience
- Pediatrics
Background:
- Prenatal substance exposure is a significant concern affecting infant development.
- Understanding the specific impacts on early attention and arousal is crucial for intervention.
Purpose of the Study:
- To investigate the effects of prenatal polydrug exposure on infant attention and arousal.
- To compare heart rate responses to various stimuli in drug-exposed versus non-exposed infants, considering gestational age and parenting stability.
Main Methods:
- 105 eight-week-old African-American infants were categorized into four groups: preterm/full-term drug-exposed and nonexposed.
- Heart rates (HRs) were recorded during baseline and in response to auditory, visual, and social stimuli.
- Hierarchical regression analysis was used to identify factors contributing to observed differences.
Main Results:
- No significant HR differences were found at baseline or for auditory/visual stimuli.
- Significant differences in HR response to social stimuli were observed (F(2, 103) = 6.54, p < 0.01).
- Drug-exposed infants exhibited HR acceleration (distress/arousal), while controls showed deceleration (focused attention); preterm infants showed a greater HR response.
Conclusions:
- Prenatal polydrug exposure, specifically cocaine, is linked to altered infant attention and arousal responses to social cues.
- Instability in parenting significantly accounted for observed differences in infant responses.
- Early identification and intervention strategies are warranted for infants exposed to substances prenatally.
Abstract:
To evaluate the effect of prenatal polydrug exposure on infant attention, 105 8-week-old African-American infants were presented a series of stimuli and their heart rates (HRs) were recorded. Infants were identified postnatally based on mothers' substance use. Four groups were tested: 1) preterm drug-exposed infants (n = 25); 2) full-term, drug-exposed (n = 32); 3) preterm nonexposed (n = 22); and 4) full-term, nonexposed (n = 26). Preterm infants' ages were corrected. Infant's baseline HRs were recorded and then stimuli presented in the following order: auditory (rattle), visual (red ring), and social (examiner's face and voice). There were no HR differences at baseline or in auditory or visual conditions. However, significant differences (F(2, 103) = 6.54, p < 0.01) were seen in response to social stimuli. Drug-exposed infants showed an acceleratory HR indicating distress or arousal and control infants showed a deceleratory response indicating focused attention and there was an interaction due to greater HR response in preterms. Hierarchical regression indicated cocaine (R2 = 0.034, p < 0.05) but not other drug use and instability in parenting (R2 = 0.137, p < 0.001) accounted for the observed differences.
