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Can our expectations affect the outcome of what we do? This week we look at the power of expectation. How good are you at blind tasting? Could you tell if you sipped three different cups of coffee which was the best quality without seeing the price? And if you were given a pill to cure a headache – do you think it would help, regardless of whether it was real medicine or not? The Swedish neuroscientist Predrag Petrovic asks if a doctor’s expectations can affect the success of a patient’s treatment, the Indian neuro-economist Baba Shiv explains why consumers expect something to be better if they pay more, and the American musicologist Elizabeth Hellmuth Margulis on why our enjoyment of music is determined by what we’re expecting to hear. (Picture: A gift in a box, tied with a red riboon, Credit: Science Photo Library)