Chapter 2: Extended Cognition

Extended Cognition academic chapter thoroughly investigates the philosophical and ontological distinctions between two prominent viewpoints within 4E cognitive science: the Embedded Theory of Cognition (EMT) and the Extended Theories of Cognition (EXT). While both agree that cognitive processes rely heavily on the body and environment, their core disagreement centers on the mark of the cognitive—that is, the specific properties a state or process must possess to be categorized as cognitive. EMT maintains a traditional stance, asserting that cognitive processes are fully realized by mechanisms located entirely inside the brain, with external resources serving only to causally influence or scaffold internal thinking. By contrast, EXT argues that environmental resources and bodily actions, under specific conditions of integration, can function as constitutive parts of the cognitive process itself, thereby extending the mind beyond the boundaries of the skull and skin. The Extended Functionalism (FEX) position attempts to defend EXT using the Parity Principle, which suggests that if an external process functions identically to one that we would accept as cognitive inside the head, it should be counted as cognitive regardless of its location. Proponents of EMT challenge this parity by highlighting fine-grained functional differences between internal memory (like Inga’s biological memory) and extended systems (like Otto’s notebook used for memory), suggesting that external contributions are merely causal, not constitutive, leading to the interpretation of such systems as hybrid—part cognitive, part noncognitive. To break this stalemate, the chapter introduces Radical Extended Cognition (REX), which rejects the traditional commitment to representational and computational models of the mind. REX draws on dynamical systems theory and ecological psychology, positing that basic cognitive processes are fundamentally nonrepresentational and extended. This approach models the agent and environment as a single, dynamically coupled system where continuous, integrated, and coordinated mutual influence (an interaction-dominant dynamic) makes it impossible to decompose them into separately functioning elements, thereby supporting the claim that the external environment is constitutively relevant to cognition. Ultimately, REX proposes that the necessary philosophical mark of the cognitive is grounded in the mutuality of the animal and its environment, specifically as a perception-action system adapted to deal with environmental affordances.