brain is a prediction machine. It is continually being assaulted by signals from the body and its environment and must predict what’s causing them. For example, when you are walking by the coast, the brain has to be able perceive that you are about to come to a cliff – if you don’t, you may fall off the edge. It does this by creating internal models of the body and the environment. To make accurate calculations, the brain must maintain prior knowledge and keep testing the integrity of its models. “The brain is a system that is continually trying to prove its own existence,” says Metzinger.
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