The Giants Shoulder #88 Meet The Neuroscientist Who Created The Best Universal Theory Of Brain Function
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Jan 25, 2026 
Karl Friston, renowned neuroscientist and creator of the Free Energy Principle, offers a unifying theory linking perception, action, learning, and self-organisation. He explains predictive processing, active inference, interoception and how emotion and the self arise from bodily prediction. He also discusses psychedelics, precision-weighting, sensory attenuation and applications for therapy and behavior.
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Brains Minimise Free Energy To Stay Alive
- Living systems persist by minimising surprise through an internal model rather than directly measuring surprise.
- The brain reduces variational free energy by updating beliefs (perception) or acting to fulfil predictions (action).
Friston’s Teaching Humility
- Karl Friston admits he's bad at simple explanations and relies on younger colleagues and philosophers to unpack ideas.
- He contrasts a 'high road' physics account with a 'low road' psychological story to teach the principle.
Perception As Hypothesis Testing
- Perception is inference: the brain generates hypotheses that explain sensory data and tests them via prediction errors.
- Predictive coding updates beliefs by minimizing precision-weighted prediction errors under a generative model.