Neuroscientist Kay M. Tye investigates how your brain gives rise to complex emotional states like depression, anxiety or loneliness. From the cutting edge of science, she shares her latest findings — including the development of a tool that uses light to activate specific neurons and create dramatic behavioral changes in mice. Learn how these discoveries could change the way you think about your mind — and possibly uncover effective treatments for mental disorders.  This week’s program was submitted by Willam Lee.