What is trauma exactly? Or the ever-elusive concept known as the "flow state"? It can all be explained by the autonomic nervous system - our body's autopilot that keeps our heart beating, our lungs breathing, and our gut digesting, without us even thinking about it. The Polyvagal Theory is a new understanding of how our nervous system works, and explains everything from trauma, to the very essence of social behavior, while shedding light on possible treatments for autism and trauma. You'll never think of your body and brain the same way again.