The Domain Loop Model: Grounding Consciousness Science in Whole-Body Homeostatic Computation

Abstract

Contemporary theories of consciousness—including Integrated Information Theory, Global Workspace Theory, Higher-Order Thought theories, and active inference frameworks—have advanced the modelling of conscious experience. Although some frameworks are substrate-neutral in principle, empirical research across these approaches predominantly focuses on neural computation, often measuring brain activity while conceptualising the body primarily as a source of sensory input rather than as a constitutive substrate. This focus neglects a key biological reality: consciousness arises from organisms composed of trillions of cells engaged in continuous homeostatic computation, with neurons representing only a small fraction of this information-processing architecture (in humans, neurons constitute less than 1% of total cellular computation). The Domain Loop Model addresses this gap, proposing that consciousness emerges from three interconnected domains: the interoceptive domain (whole-body homeostatic computation), the exteroceptive domain (environmental information processed through predictive perception), and the narrator domain (the integration of internal state with external context, constituting conscious experience). These domains are hierarchically organised, with interoceptive signals carrying evolutionary priority due to the existential consequences of homeostatic failure, creating a fundamental asymmetry in conscious experience. Drawing on clinical observations of chronic anxiety (Hartshorn & O'Brien, 2024) and empirical research on interoceptive processing, the model elucidates: (1) how unconscious prioritization of interoceptive signals creates vulnerabilities in precision-weighting systems; (2) how interoceptive opacity—the inaccessibility of most bodily computation to conscious awareness—permits pathological states to persist; (3) how epigenetic mechanisms encode precision weights across timescales from days to decades; and (4) how consciousness evolves through biological encounters that physically reorganize the computational substrate. The Domain Loop Model accounts for phenomena that current theories struggle to explain, including the persistence of chronic anxiety despite uncertainty reduction, enduring consciousness changes following post-viral syndromes, and biological substrates underlying individual differences in anxiety vulnerability. This framework suggests research directions measuring immune, metabolic, epigenetic, and microbiome markers alongside neural activity, and supports clinical applications integrating interventions targeting both physiological dysregulation and conscious interpretation patterns. The Domain Loop Model further aligns consciousness with evolutionary processes through transgenerational epigenetic inheritance, operating across timescales from acute homeostatic shifts to generational inheritance.