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The brain is often portrayed as an organ with different regions dedicated to specific tasks. But that textbook model is wrong. The brain is a dynamic system, constantly modifying its own circuitry to match the demands of the environment and the body in which it finds itself. If you were to zoom into the living, microscopic cosmos inside the skull, you would witness tentacle-like extensions grasping, bumping, sensing, searching for the right connections to establish or forego, like denizens of a country establishing friendships, marriages, neighbourhoods, political parties, vendettas, and social networks. …
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