I think it is best to just click and read this.
In a study published this year in Nature Neuroscience, several co-authors and I found that family income is significantly correlated with children’s brain size — specifically, the surface area of the cerebral cortex, which is the outer layer of the brain that does most of the cognitive heavy lifting. Further, we found that increases in income were associated with the greatest increases in brain surface area among the poorest children.
we need definitive evidence that moves beyond correlation and helps us understand the causes of these neurological differences.
That’s why I am part of a team of social scientists and neuroscientists planning a large clinical trial in which 1,000 low-income mothers will be randomly assigned to receive either a large ($333) or small ($20) monthly income supplement for the first three years of their children’s lives. Periodic assessments of the children and their mothers will enable us to estimate the impact of these cash supplements on children’s cognitive, emotional and brain development, as well as the effect on family functioning.