In a clinical trial for a new pain medication, if you were given an inactive substance instead of the actual drug but after taking it, your headache improved, this resulted from the

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This is the definition of the placebo effect - when a person's symptoms improve after taking an inactive substance because they believe it is a real medication. The nocebo effect is the opposite phenomenon where a person's symptoms worsen because they believe they are receiving a harmful treatment. The ingredients in the inactive pills would have no effect on the headache, and it is unlikely that the time that had passed would be the sole cause of headache improvement.

In a Clinical Trial for a New Pain Medication, If