Mind-Body Solution What is Ultimately Real? Consciousness, Free Energy & Spacetime | Donald Hoffman & Karl Friston
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Feb 4, 2026 
Karl Friston, neuroscientist behind the Free Energy Principle, and Donald Hoffman, cognitive scientist who argues consciousness is fundamental, converse about the deepest layers of reality. They tackle whether spacetime is emergent, how Markov blankets and trace logic connect minds to physics, and whether inference and probability can ground the world we experience.
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Logic Of Probability And Bayes' Rule
- Hoffman and collaborators found a non-Boolean propositional logic on probability measures (Lebesgue logic) where entailment is normalized restriction.
- Bayes' rule appears as the meet (and) in that logical structure, grounding inference in logic of probabilities.
Trace Logic Of Markov Chains
- Hoffman describes a trace logic on Markov chains: one Markov chain entails another if it's the trace onto a subset of states.
- This trace logic is non-Boolean but locally Boolean, and maps to stationary probability logic via a homomorphism.
Inference, Markov Blankets And Self-Evidencing
- Karl Friston links Markov partitions and Markov blankets to inference: separable subsets behave as if inferring the rest of the system via free-energy gradient flows.
- He reads perception and action as self-evidencing that minimizes surprisal, unifying life, mind and meaning under Active Inference.