"You are much less sensitive to pain than others!" People who are told so endure pain better afterwards. About the impact of expectations which is studied at the Institute of Psychology of the University of Würzburg.
Expectations have a lot of power over people as is evidenced by the placebo effect: Patients get pills that have no active ingredient. But the patients are not aware of that. Firmly believing that they are taking an effective drug, they actually get better afterwards. Only their expectations were at play here.
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