Do all the people who do not react to a placebo in a medical trial have anything in common? Is there a psychological group (personality profile?) or neurological trait that prevents placebo reactions? Is it related to general pessimism, lack of hypnotic suggestibility or to a logical, analytical mindset? Is there a genetic component or is it environmentally acquired? Is there a placebo-blocking centre in the brain? What useful things can we learn that may apply to other fields?
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