Vaccines are known for preventing viral diseases. But what if they could prevent mental illnesses? Neuroscientist Rebecca Brachman explores the potential of a drug that could stop depression and PTSD before they happen.

Rebecca Brachman is a neuroscientist and writer. After completing her PhD at Columbia University, she now works on the first drug that might prevent psychiatric disorders like depression and posttraumatic stress disorder.

This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at http://ted.com/tedx