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Nature 411, 893 (21 June 2001) | doi:10.1038/35082161

The zombie within

Christof Koch1 & Francis Crick2

To what extent are we conscious of everything going on in our brains? Nietzsche and Freud popularized the notion of the unconscious as a realm of the mind that controls human behaviour but is not itself accessible to conscious introspection or knowledge.