n. 安慰剂效果

[ 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
<noun.phenomenon>

Placebo effect \Pla*ce"bo ef*fect`\, n. (Med.)
a reaction by a patient who receives a placebo[2], in which
the symptoms of illness are lessened or an anticipated effect
is experienced. Because the placebo[2] itself has no
pharmacological activity, this reaction is mediated by the
expectations of the patient receiving the placebo[2]; the
reaction is considered as an example of the power of
suggestion.

Note: Dramatic subjective effects such as relief of
discomfort or pain are sometimes observed due to
administration of a placebo, but in some cases
measurable physiological effects may also be observed.
[PJC]