Your Brain is Running a Simulation Right Now [Max Bennett]

The neocortex functions as a generative model that enables "learning by imagining," allowing organisms to simulate future outcomes and engage in model-based reinforcement learning. This evolutionary breakthrough, supported by structures like the basal ganglia, facilitates flexible adaptation by pruning search spaces through uncertainty measurement. Primate brain expansion, driven by social complexity and political "arms races," fostered the development of mentalizing—the ability to infer the knowledge and intentions of others. Language acts as a high-bandwidth mechanism for sharing these internal simulations across generations, enabling collective intelligence and the accumulation of cultural knowledge. While modern AI models like transformers achieve impressive performance through self-supervision, they lack the agency, continual learning capabilities, and hypothesis-testing mechanisms inherent in biological brains, which remain the most robust physical manifestations of intelligence for future technological emulation.