The Structural Conditions of Consciousness 0 — Structural Knot Theory — Prologue: The Subject as Event at the Boundary of Physics and Philosophy (Repositioning State-Based Theories of Consciousness: IIT, GNW, HOT, Predictive Processing, RPT, and Epiphenomenalism)

Qualia? “What cannot be directly spoken of must remain unsaid — but it can still be structurally surrounded.” This is the guiding spirit of the present series. This paper reframes the hard problem of consciousness not as a failure of explanation, but as a structural misclassification, and proposes an event-based framework in which consciousness is understood not as a state, but as a structural event. The central claim of this work is that events are not merely descriptive conveniences, but real phenomena that arise inevitably under specific structural conditions. Just as vortices necessarily emerge in fluid systems when gradients, boundary conditions, and irreversible dissipation are present, subjectivity arises as a structural consequence in causally closed systems when a particular set of conditions is satisfied. This point of emergence is identified as a structural knot: a causal bottleneck at which multiple possible trajectories converge into a single realized outcome while alternatives become irreversibly excluded. Major contemporary theories of consciousness—including Integrated Information Theory (IIT), Global Workspace Theory (GWT/GNW), Higher-Order Thought (HOT), Predictive Processing, and Recurrent Processing Theory (RPT)—primarily treat consciousness as a state, an informational quantity, or a representational configuration. However, such state-based frameworks cannot account for the irreversible elimination of unrealized possibilities that characterizes subjective experience. This paper argues that, under causally closed conditions, subjectivity is not an optional feature but a necessary structural consequence of irreversible exclusive determination. Consciousness is therefore not a state but an event: a process in which multiple internally generated possibilities compete and are reduced to a single realized outcome, while alternatives become causally unreachable. This event is formally identified as Irreversible Exclusive State Commitment (IESC). Within this framework, subjectivity is defined as the internal positional consequence of such irreversible commitment within a single unfolding causal history under viability constraints. This identification is not introduced as a new mechanism, but derived as a structurally unavoidable event required to maintain causal closure. The present work further shows that attempts to describe consciousness through exhaustive enumeration of physical states encounter a combinatorial explosion that exceeds the computational capacity of the observable universe. This limitation is not merely practical, but structural, reflecting a fundamental mismatch between time-symmetric state descriptions and time-asymmetric event processes. This volume serves as the prologue to the series The Structural Conditions of Consciousness. Its purpose is to establish an intuitive yet structurally necessary understanding of consciousness as an event, thereby fixing the conceptual foundation required for the subsequent theoretical developments. The series proceeds to derive the minimal structural conditions for subjectivity, formalize its degree as a function of irreversible contraction of possible futures, and develop a structural decision framework for determining the presence and degree of subjectivity across biological and artificial systems. This manuscript was written with the assistance of generative AI. The author is a disability welfare worker and a complete outsider to the academic field of consciousness studies. The author first encountered the term “the hard problem of consciousness” about six months before writing this series and began thinking about it almost as if approaching a puzzle. Because the author did not possess extensive specialized knowledge at the beginning of this inquiry, the investigation proceeded not primarily by adding established theories, but by stripping the probl