placebo effect

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Hypernyms:
consequence, effect, outcome, result, event,
issue, upshot