Placebo, Inactive treatment used as control, Nocebo, Harmful effect from negative expectations, Blinding, Keeping group assignment hidden, Expectation, Belief about likely treatment outcome, Response, Change after receiving treatment, Control group, Comparison group in an experiment, Randomization, Assigning participants by chance, Efficacy, Ability to produce intended effect, Bias, Systematic error affecting results, Suggestion, Influence through verbal or contextual cues

Placebo Effect

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