Hierarchical Recursive Integration Theory (HRIT): A Unified Neurobiological Framework of Consciousness

This paper introduces the Hierarchical Recursive Integration Theory (HRIT), a structurally-specified neurobiological framework of consciousness grounded in allostatic control biology, cortical laminar architecture, and neuromodulatory gain control. HRIT formalizes conscious depth as C (Ψ) = max (Iₜotal, 0) / Iₘax, where Iₜotal is the signed additive integration of four neurally-grounded components: Hierarchical Generative Modeling (HGM), implemented by the canonical laminar microcircuit; Counterfactual Simulation (CS), implemented by hippocampal replay and pre-play; Active Free Energy Minimization (AFEM), implemented by the insular-HPA allostatic system; and Recursive Self-Representation (RSR), implemented by the mPFC–insula–TPJ metacognitive circuit. The framework's central structural contribution is a signed AFEM integration term — IAFEM = w· (AFEMᵃct − Φ₀) − β·S — which allows the net integration signal to become negative when interoceptive precision falls below the allostatic setpoint, driving phenomenal presence collapse while the three depth-component circuits remain active. This single architectural asymmetry generates three neurobiologically dissociable failure signatures from a unified mechanism: near-threshold variance inflation in dissociative and depersonalisation-derealisation disorders; monotonic suppression in anesthesia and coma; and high-entropy inter-component binding fragmentation in schizophrenic positive-symptom episodes. These signatures are directly testable with existing TMS-EEG and resting-state fMRI methodology. The Variance-Precedes-Mean (VPM) principle is formally derived from the saddle-node bifurcation of the allostatic control ODE, yielding a mathematically exact early-warning exponent (τₑscape ~ (zc − z) ^−0. 500) that provides a clinically actionable precursor to conscious state collapse. The Version 2 Metabolic Consciousness Envelope (MCE) extension replaces the static integration ceiling with a dynamic Iₘax (t, age, h) = Iₘaxbaseline · Γₙorm (t) · Eₙorm (age, h), formally grounding the diurnal expansion and contraction of conscious depth and its lifespan degradation as a function of allostatic burden. A 14-item computational suite — comprising 5 mathematical proofs, 5 computational verifications, 3 self-consistency checks, and 1 parameter recovery check — establishes internal non-contradiction; all items are classified by epistemological type and none constitute empirical validation. The framework generates 36 specific, falsifiable predictions across twelve empirical domains, with explicit falsification criteria for each.