Take a deep breath. Now exhale slowly. You’re probably not aware of it, but your heart has just slowed down a bit. Not to worry; it will speed up again when you inhale. This regular-irregular beat is ...

The first lesson in Lisa Feldman Barrett’s popular book, Seven and a Half Lessons About the Brain, 1 is titled "You Have One Brain (Not Three)." It focuses on debunking Paul MacLean’s triune model of ...