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Effects of Prenatal DHA Dose on Infant Visual Attention
John Colombo1, D Jill Shaddy2, Nicole Mathis2
1Department of Psychology and Schiefelbusch Institute for Life Span Studies, University of Kansas, Lawrence, Kansas, USA.
Insights
Prenatal docosahexaenoic acid (DHA) supplementation, particularly at higher doses, enhances infant visual learning and attention. This study suggests a dose-dependent benefit of DHA for early neurodevelopment.
Area of Science:
- Neuroscience
- Developmental Psychology
- Nutritional Science
Background:
- Prenatal docosahexaenoic acid (DHA) supplementation is linked to improved cognitive outcomes in some studies.
- Previous research often used a single DHA dose against a placebo.
- This study uniquely investigates varying prenatal DHA doses.
Purpose of the Study:
- To examine the effects of different prenatal DHA doses (200 vs. 800 mg/day) on infant visual attention.
- To assess infant visual processing and attention engagement/disengagement at 4 and 6 months.
- To determine if higher DHA doses yield greater benefits.
Main Methods:
- Follow-up of a Phase III clinical trial (NCT02709239).
- Assessed 215 infants whose mothers received 200 or 800 mg/day prenatal DHA.
- Utilized visual habituation with heart rate (HR) and a gap-overlap attention task.
Main Results:
- Infants from mothers receiving 800 mg/day DHA showed shorter look durations during habituation, indicating faster visual learning.
- A more mature pattern of HR-defined attention phases was observed with the higher DHA dose.
- DHA supplementation did not significantly impact infant heart rate or performance on the gap-overlap task.
Conclusions:
- Prenatal DHA supplementation positively influences infant visual attention and learning.
- A higher daily dose of 800 mg DHA appears more beneficial than 200 mg for these outcomes.
- Results support the role of adequate DHA intake during pregnancy for optimal infant neurodevelopment.
Abstract:
Prenatal supplementation with docosahexaenoic acid (DHA) has been reported to improve cognitive outcomes in infancy and early childhood in some studies. Existent studies have examined the effects of some dose of DHA against a true placebo; this report is the first to describe the effects of different doses of prenatal DHA on infant visual attention at 4 and 6 months of age. In a follow-up to a Phase III registered clinical trial (NCT02709239) designed to evaluate the effects of two prenatal doses of DHA supplementation (200 or 800 mg daily) on maternal physiology and fetal neurodevelopment, we assessed 215 infants delivered to these mothers at 4 and 6 months on a visual habituation task augmented with heart rate (HR) to assess visual stimulus processing, and a gap-overlap task to assess engagement and disengagement of attention. Infants of mothers supplemented with 800 mg/day of DHA had shorter look durations (indicative of more rapid visual learning) during habituation at both ages and a somewhat more mature pattern of HR-defined phases of attention. However, DHA dose did not affect infant HR, nor did it affect infant performance in the gap-overlap attention task. Results are consistent with positive effects of prenatal DHA supplementation on later outcomes, with higher benefit seen for a higher dose.
