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Nature 459, 7 (7 May 2009) | doi:10.1038/7243007a; Published online 6 May 2009

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Making the paper: Hendrikje Nienborg & Bruce Cumming

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The brain 'tampers' with incoming sensory data to fit expectations.

Our brains decipher a wealth of sights, sounds and other sensory information to allow us to make sense of our environment. But interpreting sensory inputs isn't always straightforward, as anyone who has stared at the infamous 'young girl–old woman' illusion knows.