placebo effect

Noun
  1. Any effect that seems to be a consequence of administering a placebo;
    The change is usually beneficial and is assumed result from the person's faith in the treatment or preconceptions about what the experimental drug was supposed to do;
    Pharmacologists were the first to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs (synset 111436201)

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