For those of us who are continuously baffled by the mysterious workings of the teenage brain, there is a new-ish reference book (January 2014): Brainstorm: The Power and Purpose of the Teenage Brain, An Inside-Out Guide to the Emerging Adolescent Mind, Ages 12-24 by Daniel J. Siegel, M.D. He is a neuropsychiatrist who uses brain science to help explain behaviors and emotions.
“In Brainstorm, Siegel illuminates how brain development impacts teenagers’ behavior and relationships. Drawing on important new research in the field of interpersonal neurobiology, he explores exciting ways in which understanding how the teenage brain functions can help parents make what is in fact an incredibly positive period of growth, change, and experimentation in their children’s lives less lonely and distressing on both sides of the generational divide.” (from http://www.drdansiegel.com)
Dr. Siegel also has a blog.