noun
placebo effect
Medical/psychological term; refers to improvement due to belief in treatment rather than the treatment itself. Often contrasted with プラシーボ効果 (the loanword equivalent).
See also: プラシーボ効果 (プラシーボこうか)
偽薬効果によって症状が改善することがある。
Symptoms sometimes improve due to the placebo effect.
This study examined the influence of the placebo effect.