Over the centuries, assorted theories about the nature and workings of consciousness have been put forth. The theory Zapffe implicitly accepted is this: Consciousness is connected to the human brain in a way that makes the world appear to us as it appears and makes us appear to ourselves as we appear—that is, as “selves” or a “persons” strung together by memories, sensations, emotions, and so on. No one knows exactly how the consciousness-brain connection is made, but all evidence supports the non-dualistic theory that the brain is the source of consciousness and the only source of
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