How does consciousness weave its magical web of inner awareness—appreciating music, enjoying art, feeling love? Even when all mental functions may be explained, the great mystery—what it 'feels like' inside—will likely remain. This is the 'Hard Problem' of consciousness. What could even count as a theory of consciousness, even in principle?

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Giulio Tononi is a neuroscientist and psychiatrist who holds the David P. White Chair in Sleep Medicine, as well as a Distinguished Chair in Consciousness Science, at the University of Wisconsin.

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