“模拟”干预未被认为具有显着的固有效果。安置的实例包括含有惰性物质（例如糖丸）的丸剂，静脉内输注盐水，或制造切口但没有进行的假手术。在实验中使用安慰剂时的目标是使安慰剂尽可能多地类似于实际治疗，而不会产生正在研究的干预的效果。In other words, the use of a placebo in experimentation allows the treatment and control groups to be alike in every respect except for the actual effects of treatment (e.g., both groups get a white pill, but only the pills given to the treatment group have an effect—the control group gets a placebo).

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安慰剂对大脑的强大影响