University of Pennsylvania neuroscientist Adrian Raine, author of "The Anatomy of Violence," believes that advances in brain imagery are helping to explain the biological roots of crime. American Enterprise Institute scholar and psychiatrist Sally Satel, co-author of "Brainwashed," is wary of the seduction of brain scans. The Washington Post brought them together for a conversation about the promises and pitfalls of brain imagery.

Adrian, could you start us off with one of the images from your work? Tell us what we're seeing and what some of your research suggests.