The Four-Model Theory of Consciousness: A Simulation-Based Framework Unifying the Hard Problem, Binding, and Altered States

The science of consciousness remains in a pre-paradigm state, with no theory simultaneously satisfying the eight core requirements a complete theory must meet: the Hard Problem, the Explanatory Gap, the Boundary Problem, the Structure of Experience, Unity and Binding, Combination and Emergence, the Causal Role, and the Meta-Problem. This paper presents the Four-Model Theory, in which consciousness is constituted by real-time self-simulation across four nested models arranged along two axes - scope (world vs. self) and mode (implicit vs. explicit). The implicit models (Implicit World Model, Implicit Self Model) are substrate-level, learned, and non-conscious. The explicit models (Explicit World Model, Explicit Self Model) are virtual, transient, and phenomenal - they are the simulation in which experience occurs. The theory’s central claim is that qualia are constitutive properties of the computational level - digital constructs that exist at the level of the running computation but are incoherent at the substrate level, just as a spreadsheet cell’s value is incoherent at the transistor level. This dissolves the Hard Problem by revealing a category error - a level confusion that seeks phenomenal properties at the substrate level where they categorically do not exist. Self-referential closure explains why this specific computational process has experience when a weather simulation does not: the system’s model includes a model of itself, collapsing the inside/outside distinction and making experience constitutive rather than additional. Combined with a criticality requirement (the substrate must operate at the edge of chaos), the theory derives diverse phenomena from five principles: criticality, virtual qualia, a redirectable Explicit Self Model, variable implicit-explicit permeability, and virtual model forking. These principles unify psychedelic phenomenology, anesthetic mechanisms, dream states, split-brain phenomena, dissociative identity disorder, and animal consciousness. A systematic comparison shows the theory addresses all eight requirements. Unusually for a consciousness theory, the framework has substantial empirical grounding: five claims that follow from its core axioms - established in 2015 - have since been independently confirmed by research groups with no connection to the theory, including the anesthetic-criticality convergence (Casali et al., 2013; Hengen and Shew, 2025; Algom and Shriki, 2026), sleep-dependent criticality restoration (Bhatt et al., 2024), sleep onset as bifurcation (Li et al., 2025), and split-brain holographic degradation (Pinto et al., 2017). Four novel predictions remain untested - including that psychedelics should alleviate anosognosia and that ego dissolution content is controllable via sensory input - predictions no competing theory generates. Changelog v5 Version 5 changes (2026-05-11): Strengthened Frankish/weak illusionism engagement (Section 3.4.4): named weak illusionism explicitly, argued specific distance, acknowledged empirical indistinguishability, framed ethical consequence for artificial consciousness Added concrete criticality signatures (Section 3.7): DFA alpha, branching ratio sigma, avalanche exponents as operational signatures with testability commitment Expanded animal consciousness section (Section 6.4): added Nieder et al. 2020 (corvid single-neuron correlate), Barron & Klein 2016 (insect boundary question), Birch 2020 (dimensions framework), Godfrey-Smith 2016 (cephalopods) Rewrote Prediction 3 (Section 8.4): replaced "DMN = ESM network" claim with cosine-distance formulation (d ≥ 0.5 self-referential vs d < 0.2 sensorimotor) Restructured Section 4.2 into four subsections: Dual Evaluation, Free Will/Identity, Cognitive Learning, Standard Objections Condensed Section 6 from eight subsections to three focused clinical sections (psychedelics, anosognosia, DID) while preserving dreams and split-brain as condensed subsection Added 10 new citations: Seth & Bayne 2022, Aru/Suzuki/Larkum 2020, Laukkonen/Friston/Chandaria 2025, Metzinger 2024, Dehaene 2021, Kleiner 2024, Barron & Klein 2016, Birch et al. 2020, Nieder et al. 2020, Godfrey-Smith 2016 Pruned self-citations from 21 to 8 (kept first mention, derivation claim, convergence section, companion papers) Softened language throughout: "dissolves" → "addresses" for Hard Problem claims; "pre-paradigm state" → "has not converged"; "crisis" → "difficulty" Added derivation chains to all four predictions (principle → mechanism → prediction) Qualified Prediction 4 (measurement protocol premature; criticality markers ≠ gamma; Voss 2014 acknowledged) Added power-law counterargument citation (Touboul & Destexhe 2017) Acknowledged blindsight residual phenomenology (Phillips 2021) Made foundational commitment explicit (parallels IIT axioms, GNW broadcasting thesis) Fixed section numbering, table numbering, and reference list alphabetical ordering Removed 11 orphaned references from prior section cuts