In this podcast, Jad talks to Charles Fernyhough about the connection between thought and the voice in your head. How did it get there? And what's happening when people hear someone else's voice in their head?

Susan Schaller believes that the best idea she ever had in her life had to do with an isolated young man she met one day at a community college. He was 27-years-old at the time, and though he had been born deaf, no one had ever taught him to sign. ...