Executive function
How does early poverty lead to weaker school skills?
Open access · cc by · source: Europe PMC
Children exposed to more poverty-related stress in infancy did worse in reading and maths by Grade 2, partly because they had weaker self-control and thinking skills and weaker kindergarten social skills that in turn held back those thinking skills.
Study at a glance
- Design
- Cohort — Prospective longitudinal birth cohort (Family Life Project); cumulative poverty risk averaged over infancy home visits, EF tested at preschool age and Grade 1, teacher-rated social competence in kindergarten and Grade 1, achievement tests in Grade 2; autoregressive cross-lagged mediation in structural equation models with bootstrapped indirect effects.
- N
- N=1044 · 1,044 children with at least one Grade 2 achievement score, from a cohort of 1,292 families; missing data handled by full-information maximum likelihood.
- Population
- Children from predominantly low-income, rural families in North Carolina and Pennsylvania, followed from birth to Grade 2
- Outcome
- Grade 2 academic outcomes (Woodcock-Johnson reading and applied maths) modelled as a latent variable
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Higher cumulative risk predicted lower Grade 2 achievement (standardised coefficient of 0.220 in the negative direction) as well as poorer executive function and social competence. Two indirect routes were significant: early executive function carried forward to Grade 1 executive function (about 36% of the risk-achievement link), and kindergarten social competence predicted Grade 1 executive function (about 16%). The reverse route, from executive function to later social competence, only approached significance, and neither skill mediated on its own.
Methodology
The researchers followed a large birth cohort of mostly low-income families from rural North Carolina and Pennsylvania. They built a cumulative risk score from 7 poverty-related indicators (such as income-to-needs, maternal education, household crowding and neighbourhood safety) measured over infancy, tested children's executive function with games tapping inhibition, working memory and flexible switching, collected teacher ratings of prosocial behaviour and peer relationships, and gave standard reading and maths tests in Grade 2. Structural equation models tested whether executive function and social competence carried the link between early risk and later achievement, controlling for earlier executive function, sensitive parenting, sex, race, age and state.
Limitations
The data are correlational, so even with a longitudinal design the pathways show plausible order of influence rather than proven causes, as the authors stress. The cumulative risk index weights every risk factor equally and cannot say which aspect of poverty matters. Social competence came only from teacher ratings in school, which may be biased by teachers' views of children's academic ability, and the models do not track within-child change. The text also reports a negative direct path from Grade 1 executive function to achievement in the full model, which sits oddly with the mediation results and is not explained.
How this study connects
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