 Do you have a voice inside your head? And I don't mean like a creepy, I hear voices kind of way. I mean like the monologue that goes on inside your head throughout your day. Some of you do. Some of you don't. Some of you maybe aren't sure. Me, it's constant. There is a constant voice talking to me in my head. And sometimes I wonder how useful it is since it seems to be so critical. Some new research explores exactly this phenomenon. How are these voices different for different people?