Images of the right and left hemispheres of the brain, as viewed from the side. The colors represent the differences in cortical thickness between the high-risk group, which has a family history of depression, and the low-risk group, which has no known risk. Blue and purple represent the thinning of the cortex, with purple regions having the greatest thinning. Green areas show no significant differences between the two groups. Credit Dr. Bradley S. Peterson/Columbia University
{}