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   Definition of Placebo effect
      Placebo effect: Also called the placebo response. A remarkable
      phenomenon in which a placebo -- a fake treatment, an inactive
      role in the placebo effect. The more a person believes they are going
      governmental approval of a new treatment often use placebo-controlled
      than those taking placebo, the study helps support the conclusion that
      name. The scientific study of the placebo effect is usually dated to
      the pioneering paper published in 1955 on "The Powerful Placebo" by the
      responded to placebo.
      It has been shown that placebos have measurable physiological effects.
      taken a stimulant. Placebos have the opposite physiological effects
      The placebo effect is part of the human potential to react positively
      People who receive a placebo may also experience negative effects. They
      nausea, diarrhea and constipation. A negative placebo effect has been
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