Physics describes interactions. Biology describes sensing. These two vocabularies have coexisted for centuries without a connecting framework. What is the physical difference between a force acting on a particle and an organism sensing a stimulus?
BFUT Paper 20 closes this gap with a formal definition. Sensing is interaction satisfying three specific physical conditions.
The Three Conditions
Structural coupling: The system has a physical structure that preferentially couples to the relevant interaction channel. A rock is gravitationally coupled to all surrounding masses. An organism with a vestibular system has a structure specifically organised to respond to gravitational gradients in a directional and amplified way. Structural coupling is the prerequisite for information-specific response.
Information-specific state change: The system's internal state changes in a way that reflects the specific information content of the incoming signal, not just its energy magnitude. A billiard ball struck by another changes momentum — reflecting only momentum transfer, not the source's identity. A sensory receptor producing a graded response proportional to electromagnetic wave frequency is performing an information-specific state change.
State persistence: The state change persists long enough to be integrated or acted upon. A transient response that immediately decays is not sensing — it is a momentary perturbation. A persistent change that propagates through the system and influences subsequent behaviour is sensing.
The State-Change Functional
Paper 20 derives the governing equation of sensing — the state-change functional — from the Spaticle field Lagrangian:
The four terms correspond to the four force channels. Coefficients α, β, γ, δ are functions of the system's structural configuration — a system's position in the consciousness hierarchy is determined by which coefficients are non-zero and how large they are.
Five Confirmed Suppression Tests
Ionising radiation disrupts photoreception (confirmed). Protein denaturation eliminates immune recognition (confirmed). Axonal degeneration disrupts interoceptive integration (confirmed). ATP synthesis inhibition eliminates neural sensing (confirmed). Sodium channel blockade eliminates neural signalling (confirmed). Every test confirmed. No exception found.
Download BFUT papers, simulation code, and companion materials: vijayshankarsharma.com/downloads/