Non linear correlation of economic status and child brain development

http://archpedi.jamanetwork.com/article.aspx?articleid=2381540

http://archpedi.jamanetwork.com/article.aspx?articleid=2381542

"While brain structure and development may not be the only mechanism underlying the income achievement gap, the novel evidence presented in this study seems to suggest that 1 component linking parental SES to children’s achievement and human capital more broadly operates through a neurobiological mechanism. "

Genomics is the second, obviously.