At times, control subjects may experience an apparent effect of the study treatment even though they did not receive any treatment. This phenomenon is called

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The phenomenon described is the placebo effect, which is the perceived improvement in symptoms or condition due to a nonactive treatment (such as a sugar pill or saline injection). Control subjects may report feeling better due to the psychological effect of participating in a study or receiving attention from healthcare providers.

At Times, Control Subjects May Experience an Apparent Effect of the Study