Nonlinear Decline in the Association between Birth Weight and Cognitive Ability from Infancy to Midlife in a Community Sample of Twins
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View abstract on PubMed
Summary
This summary is machine-generated.Birth weight impacts cognitive ability from infancy, with the association weakening by age 2.5 years. Shared environmental factors explain this decline, though a small effect persists into midlife.
Area Of Science
- Developmental Psychology
- Behavioral Genetics
- Cognitive Neuroscience
Background
- Birth weight is a key indicator of prenatal development and is linked to cognitive ability.
- Understanding the trajectory of this association across the lifespan is crucial for developmental origin models.
Purpose Of The Study
- To investigate the association between birth weight and cognitive ability from infancy to midlife.
- To explore phenotypic and biometric factors influencing this relationship using a twin study design.
Main Methods
- Prospective longitudinal study of 1,501 twins from the Louisville Twin Study.
- Exponential decay functions modeled changes in birth weight-cognitive ability association.
- Biometric regression analyzed shared environmental influences.
Main Results
- The association between birth weight and cognitive ability decreased exponentially from infancy (β = .59) to midlife (β = .27).
- This association stabilized around 2.5 years of age.
- Shared environmental factors explained the decline, with a small positive within-pair association remaining.
Conclusions
- Prenatal experiences, indicated by birth weight, have lasting effects on cognitive development.
- Findings support developmental origin models of cognitive ability across the lifespan.
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