Now he's out with a fascinating new book looking at our emotions: What's hard wired and what's not; how gender, age, religion, nationality and class all affect our interactions with each other; how we respond to risk, how we live our lives. It's a deep, illuminating picture of what goes on inside our heads.
This hour, On Point: Jerome Kagan and what our feelings are made of.
Jerome Kagan, professor emeritus of psychology at Harvard University, where he served as director of the Mind/Brain Behavior Interfaculty Initiative. His new book is "What is Emotion?".
This program aired on November 16, 2007.