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Can we truly trust our minds? The placebo effect is one of the greatest phenomena in medicine which provides evidence that our brains are deceiving us; that our perceptions of pain are distorted by our expectations. This talk explores the mechanisms through which the placebo effect operates and the origins of its discovery. Haya is a student at Francis Holland School, Sloane Square. She plans on studying Psychology at University. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at www.ted.com/tedx