Chapter 8: Dynamical Systems Become Extended and Embodied

The authors, Maurice Lamb and Anthony Chemero, frame their argument around the historical rejection of the Belousov-Zhabotinsky reaction in chemistry, using it as an analogy to demonstrate how traditional cognitive science mistakenly views the mind as a closed, equilibrium-based system, thereby rendering extended cognition theoretically impossible. To counter this, the text establishes two critical empirical postulates: the interaction hypothesis and the openness hypothesis. The interaction hypothesis argues that the components of a cognitive system are mathematically coupled and interdependent, meaning that the behavior of one variable (such as neural activity) cannot be adequately solved or understood in isolation from other variables (such as bodily movement or environmental constraints), resulting in non-linear behaviors and long-term temporal correlations similar to those seen in laser physics or cardiac dynamics. The openness hypothesis expands this by asserting that cognitive systems are thermodynamically open and operate far from equilibrium, relying on a continuous exchange of energy and information with the environment to maintain self-organization and order,. The chapter synthesizes these theories with empirical evidence, citing Kelso’s coordination dynamics to show how brain and body form a unified system (embodiment), and reviewing Richardson’s rocking chair experiments to illustrate how social agents spontaneously synchronize into a single multi-agent system (extension). Furthermore, the authors discuss the Heideggerian transition from readiness-to-hand to presence-at-hand through Dotov’s mouse-tool experiments, proving that system boundaries are fluid and defined by interaction density rather than anatomical borders. This approach ultimately offers a naturalistic, non-magical explanation for how minds extend beyond the skull,.