The brain changes throughout childhood. It increases in volume and the number connections between neurons grow. During adolescence, the brain prunes away unnecessary connections and overall brain volume drops. High stress environments or lack of access to resources -- both of which are linked to poverty -- can impact brain cells during adolescence and into adulthood. Jamie Hanson, assistant professor of psychology at the University of Pittsburgh, discusses how both stressful situations and a lack of resources can physically change the adult brain, which raises concerns of how living in poverty could negatively affect children, whose brains are still developing.