what I unofficially call my 👻 Ghost Protocol 👻

what I unofficially call my 👻 Ghost Protocol 👻

A Closed-Loop Environmental-Perceptual Model of Perceived Presence in Architectural Spaces

Abstract

Reports of perceived presences and “haunted” environments cluster non-randomly in specific architectural contexts, particularly older institutional and residential buildings characterized by rigid materials, elongated corridors, stairwells, and vertical shafts. No reproducible evidence supports the presence of external intelligent agents. This paper proposes a closed-loop model in which architectural resonance, low-frequency environmental energy (including infrasound), vestibular–somatic disturbance, and predictive threat inference interact to produce these experiences. A formal operator-theoretic framework models the system as a coupled slow–fast PDE–ODE with state-dependent sensing, demonstrating perceptual observability collapse while environmental fields remain bounded. The model draws on building acoustics, vestibular neuroscience, and predictive processing, yielding testable predictions for spatial clustering, individual susceptibility, and mitigation via architectural and environmental modification. Implications for indoor environmental quality and occupant well-being are discussed.

1. Introduction

Perceived presences—sensations of being watched, followed, or accompanied by an unseen entity—occur disproportionately in particular architectural settings. Common features include rigid construction materials, long reverberant corridors, stairwells, vertical shafts, and limited acoustic damping. Cultural narratives often invoke external agents, but systematic investigations have not produced reproducible physical evidence supporting such claims. The consistency of reported phenomenology and spatial clustering suggest identifiable physical and perceptual mechanisms.

Previous research has examined architectural acoustics, infrasound, vestibular disturbances, and cognitive threat detection separately. This paper integrates them into a unified closed-loop framework. Low-frequency environmental energy perturbs bodily systems, arousal biases predictive processing toward agency attribution, and heightened vigilance reinforces the cycle. A mathematical model formalizes this as perceptual observability collapse in a stable environmental plant.

2. Architectural Resonance and Low-Frequency Energy Trapping

Enclosed architectural spaces with rigid materials (stone, brick, concrete) and parallel surfaces support standing acoustic waves and structural vibration modes, particularly below 100 Hz. Long corridors and vertical shafts act as waveguides with limited damping. Sources such as HVAC systems, plumbing, traffic, and wind provide persistent low-frequency excitation that couples into structural modes, producing spatially heterogeneous, fluctuating energy distributions.

Material-dependent persistence governs decay rates, with higher retention in iron-rich stone or quartz compared to drywall. These fluctuating hotspots create intermittent vestibular stimulation without necessarily producing audible sound.

3. Vestibular and Somatic Responses to Environmental Disturbance

The vestibular system is highly sensitive to low-frequency acceleration and pressure variations (0.5–20 Hz range), even when sub-audible. Infrasound exposure is associated with dizziness, chest pressure, nausea, disorientation, and autonomic arousal, including elevated cortisol. Structural vibration propagates through floors and walls, producing subtle whole-body effects that destabilize spatial reference frames and increase susceptibility to visual and auditory misperceptions in low-light conditions.

4. Predictive Processing and Threat Inference

Perception operates via predictive processing, where the brain generates hypotheses about sensory input and minimizes prediction error. Under physiological arousal and sensory ambiguity, threat-relevant interpretations—particularly agency detection—are preferentially weighted due to evolutionary pressures favoring false positives over missed dangers. Cultural narratives supply ready-made explanatory templates that shape post-experience memory and expectation, further reinforcing the perception of ongoing external activity.

5. Operator-Theoretic Model of Perceptual Observability Collapse

The closed-loop interaction is formalized as a coupled slow–fast PDE–ODE system. The environmental field (\Phi(x,t)) (low-frequency energy imprint in resonant architecture) evolves as the slow distributed plant, while perceptual/vestibular processing acts as the fast observer via a state-dependent observation operator.

*Slow Environmental Plant: [ \partial_t \Phi = \mathcal{D} \Phi - \lambda(x) \Phi + \mathcal{A}(x,t) + \varepsilon \mathcal{B} u(z), ] where (\mathcal{D}) is a diffusion operator with material-dependent damping, (\lambda(x)) encodes decay, and (\mathcal{A}(x,t)) represents bounded infrasound and structural inputs.

*State-Dependent Observation: [ y(t) = \mathcal{O}(\Phi(t), z(t)) \Phi(t) + \nu(t), ] with (\mathcal{O}) degrading under high ambiguity or arousal (e.g., (\mathcal{O}(\Phi) = \frac{1}{1 + \Phi^2})).

Fast perceptual dynamics close the loop. Singular perturbation yields reduction to a slow manifold. The environmental plant remains Lyapunov bounded (energy persists without divergence), but degeneracy of (\mathcal{O}) induces loss of uniform observability.

Observability Gramian: [ Wo(t,T) = \int{t-T}^t e^{\mathcal{L}^ s} \mathcal{O}_s^* \mathcal{O}_s e^{\mathcal{L} s} \, ds. ]

When trajectories drive (|\mathcal{O}t| \to 0), (\lambda{\min}(W_o(t)) \to 0) and the filtering Riccati covariance diverges despite plant stability. This Degenerate Sensing Regime produces structured prediction residuals that the brain interprets via threat priors as external agency, sustaining the perceptual loop through heightened vigilance.

Simulations using finite-difference discretization and tunable coupling reproduce phase transitions matching observed stability basins, reflection envelopes, and accessibility windows in resonant environments.

6. Integration into the Closed-Loop

7. Architectural geometry and material properties trap low-frequency energy.

8. Infrasound/vibration perturbs vestibular and somatic systems, generating arousal and ambiguity.

9. Arousal biases predictive processing toward agency attribution.

10. Attributed presence increases vigilance and anomaly detection.

11. Reinforcement sustains the degenerate sensing regime.

This explains spatial clustering (resonant hotspots), persistence, escalation with priming, and individual variability.

7. Identifiability, Controls, and Boundary Conditions

Identifiability : Environmental parameters (resonance spectra, material damping, infrasound levels) are recoverable via on-site mapping with spectrum analyzers and accelerometers. Perceptual parameters via questionnaires and physiological monitoring. Loop strength is testable through interventions.

False Positive Controls

: Modern damped buildings, expectation education, low-supernatural-prior cultures, high sensory clarity (bright lighting, stable conditions), and source isolation (e.g., fixing mechanicals) break the loop.

Boundary Conditions : The model fails in low-noise stable environments, under strong bottom-up sensory signals, with absent cultural priors, in low-susceptibility individuals, or at extreme forcing levels that produce overt (non-ambiguous) physiological effects. 8. Implications for Indoor Environmental Quality and Design

Low-frequency vibration and resonance deserve greater attention in building standards. Strategies such as increased damping, irregular geometry, and mechanical isolation can mitigate feedback loops. Public education on environmental contributors reframes anomalous experiences naturalistically, reducing anxiety amplification.

9. Limitations and Future Work

This framework synthesizes existing literature and formal modeling rather than new multi-site measurements. Individual and cultural variability adds complexity. Future work should include in-situ multi-sensor monitoring, longitudinal experience sampling, controlled interventions, and expanded simulations.

10. Conclusion

Perceived presences in architectural spaces emerge from closed-loop interactions between resonant environments, low-frequency energy, vestibular-somatic disturbance, and predictive processing. The operator-theoretic model rigorously demonstrates perceptual observability collapse while environmental fields remain bounded. Recognition of these mechanisms enables scientific investigation and practical mitigation, reframing reports as signals of human–environment coupling within built environments.

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