When we go for a hike, most of us don’t need to concentrate on walking around trees and not into them. And while that sounds silly, there’s actually a very complex mind-body system at work to keep that disaster at bay. Scott Grafton, chair of the neuroscience department at the University of California – Santa Barbara, joins host Krys Boyd to discuss the science of how we move without thinking. His book is called “Physical Intelligence: The Science of How the Body and the Mind Guide Each Other Through Life.”