Key idea: Early experience leaves traces in the developing brain, but those traces can be changed.
Noble and colleagues (2015) scanned 1,099 children and young people in the US. Lower family income was linked to smaller brain surface area in regions for language and self-control, most strongly in the poorest families. Rutter and colleagues found children adopted out of Romanian orphanages before six months mostly caught up.
Risks
- Poverty and chronic stress
- Neglect and trauma
- Peer pressure in adolescence
Protective factors
- A caring adult
- Stable, stimulating care
- Support at school
Watch out: Linked is not caused. Income studies are correlational; poverty brings many factors at once.
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Key idea: Brain-income links are correlational. A natural experiment, where income changes for outside reasons, shows whether money itself matters.
What the research shows
- A reliable link: income and brain (Noble)
- More income, fewer problems (Costello)
- A route: parents' time and stress
Where to be careful
- Poverty brings many factors at once
- Shared genes in families
- The brain stays plastic
What HL adds: The culture extension: what counts as poor, and what poverty means for a child, differs between countries. Ask whether a finding from the USA transfers before you use it elsewhere.