Professor Explains 'How Emotions Are Made'

Human emotions have confounded people for centuries, especially people who want to measure and understand them.

Our next guest is one of those researchers. Her advice is think of emotions like money: very real but also created by human agreement.

Northeastern University psychology professor Lisa Feldman Barrett says this in her new book, "How Emotions Are Made: The Secret Life of the Brain."

Lisa Feldman Barrett, director of the Interdisciplinary Affective Science Laboratory at Northeastern University, where she's also university distinguished professor of psychology. Her new book is "How Emotions Are Made: The Secret Life of the Brain." She tweets @LFeldmanBarrett.