Pioneering neuroscientist Karl Friston joins Tim to talk about a concept he’s developed called the free-energy principle, which may hold the key to advancing the understanding human intelligence as we know it. Karl is a theoretical neuroscientist. He’s an authority on brain imaging. His work has advanced mankind’s understanding of schizophrenia, among other things. At the moment, he’s becoming better known as the originator of the free-energy principle for human action and perception. In this episode, we’ll talk with Karl about that free-energy principle, what it is, what it means and what it can mean for the future.