The great challenge is explain consciousness—the inner experiences of sense, thought, intent, feelings. It's what David Chalmers calls 'The Hard Problem' of consciousness. Is our mental life a random accident, solely the product or byproduct of physical brain? Or is conscious awareness deeply special, perhaps revealing hidden realities of how the world works?

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Christof Koch is a neuroscientist best known for his work on the neural bases of consciousness.

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Closer to Truth, hosted by Robert Lawrence Kuhn, 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.