The idea is that the content of consciousness is the content of a simulated world in our brains, and the sense of being there is itself a simulation. Our conscious experience of the world is systematically externalized because the brain constantly creates the experience that I am present in a world outside my brain. Everything we know about the human brain today indicates that the experience of being outside the brain, and not in a tunnel, is brought about by neural systems buried deep inside the brain. Of course, an external world does exist, and knowledge and action do causally connect us to
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