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Does it exist? If so, how does it relate to the material world-including that mass of maybe a trillion nerve cells that is the human brain? Or is it a mirage, no more than an idea that Homo sapiens (Man the knower) developed in the prescientific era to explain the capacity for thought, feeling, and deliberate action that marks him off from the rest of nature?
Mirage or not, changing notions about the mind and the na- ture of reality have been important all through history. The foundations of...