Neuroscientist Joseph LeDoux describes the underlying brain mechanisms that make us feel emotions. He's the author of The Emotional Brain: The Mysterious Underpinnings of Emotional Life, which investigates the origins of human emotions such as fear, love, hate, anger, and joy, and explains that many exist as part of complex neural systems that evolved to enable us to survive. He is also the singer and song writer in The Amygdaloids, a rock band that sings about mind and brain, and with which  Rosanne Cash has recorded.