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A placebo can work even if the patient does not believe it is a real treatment.
This can be because patients have a conditioned response to an encounter with their doctor. Just like an arachnophobe's body can react negatively to a spider even if they know it's not poisonous, so a person can react to treatment from a doctor even if they know the doctor is giving them a sugar pill.
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Placebos were used in clinical trials in the 18th century to debunk "quack" cures. The so-called "non-quack" cures included bloodletting and feeding patients the undigested material from the intestines of an oriental goat. These needed no trials because they were considered to be...
It is accepted that placebos are not ethical because they require deceptions. But this view does not account for the evidence that we don't need deception for placebos to work.
Further mistaken claims:
A review of over 50 placebo-controlled surgery trials shows that fake surgery worked as well as the real surgery in more than half the trials.
One famous study is from an American surgeon Bruce Moseley. 180 patients had such severe knee pain that even the best drugs fa...
Early placebo trials that tested the effects of homoeopathy tablets revealed that doing nothing was better than both homoeopathy and allopathic (standard) medicine.
In the 1990s, Danish medical researchers compared people who take placebos with people who take no treatment...
A comprehensive study published in 1999 found that placebo effects were caused by both expectancy and conditioning.
But some researchers argue that there is something mysterious about how placebos work. While it is easy to see what happens inside the brain to the amygdala, or the other bit...
"A good laugh and a long sleep are the best cures in the doctor’s book."
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Placebos are often used in clinical drug trials to determine how well a potential medicine will work.
If you are looking at a clinical trial, a psychology study, or an animal study, it must be a randomized, placebo-controlled, double-blind study.
The American Medical Association created a policy concerning placebos that states that "physicians may use placebos for diagnosis or treatment only if the patient is informed of and agrees to its use."
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