WHAT IT DOES: Helps the brain process rewards
WHAT HAS GONE WRONG: Studies show overactivity and a 30% loss in gray matter in this region, causing people to lose judgment about how certain behaviors, such as overspending or being sexually indiscriminate, will affect their lives
WHAT IT DOES: Parts of the prefrontal cortex regulate emotion and are instrumental in processing rewards and motivation
WHAT HAS GONE WRONG: Studies show a 20% to 40% reduction in gray matter-the result of a loss of the branches that connect neurons
WHAT IT DOES: One of the brain's emotional centers;...