Michael Turvey is the leading exponent of a physical biology of intentional systems for all creatures great and nano. In these interwoven lectures, he charts a path to a thoroughly scientific psychology, grounded in philosophy, ecology, thermodynamics, and the theory of complex systems. Developed over the course of an esteemed career, Turvey’s radical vision (in the sense of going to the root) throws down the gauntlet for the next generation of students of perceiving, acting, and knowing.William H. Warren, Chancellor’s Professor of Cognitive Science, Brown University