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For the brain and mind to be the same thing, mind must be entirely the output of brain. This means the mind must be the brain—literally, identically. If so, then the physical world is likely all that exists. But if mind and brain are not the same thing, then what? Could there be extra stuff in the physical world? Could reality go beyond the physical?

David Eagleman is a neuroscientist and writer at Stanford University.

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Closer To Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.