Multiple Sclerosis as Barrier and Conduction Decoherence: Self-Boundary Failure, Virtual Hypoxia, and the Corruption of Signal in Transit

Multiple sclerosis is classically defined as an immune-mediated demyelinating disease of the central nervous system, characterized by focal inflammatory lesions disseminated in space and time and by clinical courses that include relapsing–remitting, secondary progressive, and primary progressive forms. While contemporary immunology and neuropathology have mapped the cellular vectors of tissue injury with high resolution, several organizational questions remain under-specified: why self-tolerance fails at organism-level boundaries, why myelin injury produces heterogeneous conduction and network effects, and why early disease retains a capacity for substantial functional recovery that later narrows. Within the framework of Informational Nosology, this monograph formalizes multiple sclerosis as Portal III (Barrier and Conduction Decoherence). The primary lesion is dual: progressive loss of precision in self-boundary recognition, coupled with destruction of the physical medium of neural transmission — the oligodendrocyte–myelin unit. Demyelination is interpreted not merely as slowed conduction but as the generation of conduction noise (temporal jitter, intermittent block, and ephaptic phenomena). Chronic demyelination imposes a continuous metabolic tax — “virtual hypoxia” — that drives the transition from reversible conduction failure to irreversible axonal transection. In explicit contrast to Portal I (Alzheimer’s disease), where intent itself frays, and Portal II (Parkinson’s disease), where intent remains intact but trapped behind failed subcortical gain, Portal III preserves both cortical intent and basal gain generators while corrupting the signal in transit. The resulting architecture completes the Gradual-Portal Triad and supplies a unified organizational grammar for barrier failure, channel degradation, relapse–remission dynamics, and the horizon of secondary progression. The work is theoretical and systems-level; it does not displace established immunology, imaging criteria, or disease-modifying therapies. Highlights Formalizes multiple sclerosis as dual failure of self-boundary recognition and physical channel fidelity (Portal III). Interprets demyelination as the generation of conduction noise—temporal jitter, conduction block, and ephaptic phenomena—rather than simple slowing of transmission. Introduces virtual hypoxia as the metabolic driver linking chronic demyelination to irreversible axonal loss. Distinguishes the early re-coupling window of relapsing–remitting disease from the irreversibility horizon of secondary progression. Completes the Gradual-Portal Triad by establishing Conduction Noise as the third primary noise mode alongside Semantic Noise (Portal I) and Gain/Threshold Noise (Portal II). Maintains strict non-displacement of established immunology, imaging criteria, and disease-modifying therapies. Keywords Multiple Sclerosis; Barrier Decoherence; Conduction Noise; Self-Boundary Failure; Virtual Hypoxia; Saltatory Conduction; Relapse–Remission; Secondary Progression; Informational Nosology; Portal III; Corrupted Intent; Causal Conductivity