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placebo effect

Desirable effects that are or could be caused by an “inactive” treatment, presumed to act psychologically through suggestion

Full explanation:

Placebo effects are desirable effects of an “inactive” treatment, such as drugs, devices or procedures without active ingredients.

Active treatments can also have placebo effects. For this reason, placebos are sometimes given to a comparison group in studies to distinguish between placebo effects and nocebo effects and treatment effects beyond any placebo or nocebo effects.

See also:

nocebo effect

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