A new UCLA imaging study shows a strong relationship between the genetic predisposition for Alzeimer’s disease and breakdown of myelin, the fatty insulation coating the brain’s internal wiring. The findings suggest that genetic testing coupled with brain imaging may lead to the discovery of treatments for the prevention of Alzeimer disease. Larry Mantle talks with UCLA neuroscientist George Bartzokis about the study, and about the growing body of evidence showing the importance myelin plays in proper brain function.