Concepts as Structural–Dynamic Stabilizations: Toward a Fourth Theory Beyond Classical, Prototype, and Theory-Theory

Concepts are the foundational units of cognition, enabling classification, reasoning, communication, and knowledge formation. Three dominant theories have shaped modern understanding of concepts: the Classical Theory, which treats concepts as definitions specified by necessary and sufficient conditions; Prototype Theory, which models concepts as statistical centers with graded membership; and Theory-Theory, which situates concepts within explanatory cognitive frameworks. While each theory captures essential aspects of conceptual structure, all share a common limitation: they treat concepts as relatively static entities. This paper argues that concepts are better understood as dynamically stabilized cognitive structures arising through continuous interaction between observer and environment under structural constraints. To address the limitations of prior theories, this paper introduces the Structural–Dynamic Stabilization Theory of Concepts (SDSC), which proposes that concepts emerge, stabilize, and evolve through recursive interaction governed by perceptual, cognitive, linguistic, and environmental regularities. Drawing on the author's prior work on conditional stabilization as the ontological ground of object identity, the paper establishes that conceptual identity is a specific instance of the more general phenomenon by which things maintain their identity through conditional invariance across structured transformations. The paper introduces the Structural Dependence Principle of Concepts, which establishes that the formation of any concept presupposes an underlying network of relational structures — including the enduring non-conceptual ground that sustains all conceptual activity. The practical and diagnostic implications of SDSC are developed through a Conceptual Integrity Principle and Three-Zone Model that map the boundaries within which concepts function properly and the conditions under which they systematically fail. A worked case study traces the progressive stabilization of the concept of water across pre-scientific, early scientific, and contemporary contexts. Concrete experimental paradigms and five empirical predictions distinguish SDSC from existing theories. SDSC integrates insights from philosophy of mind, epistemology, phenomenology, cognitive science, and dynamical systems theory, offering a more comprehensive ontological and epistemological account of conceptual formation, stability, and change.