Sometimes in psychology research as in other forms of research placeboes are used. A placedbo is described as a "magic pill" because it doesn't actually have any medical value to it, the only reason it is used is to make the experiment particants blind to which treatment group they are actually in. The psychological value is the important part, because we do not know what the mind is capable of so some participants in the placebo groups will have an improvement even though they weren't actually given anything.
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