In a simple blind study, the project leader knows which drug I am taking. There is a good chance that the effect of the drug on me is triggered by the placebo effect. But why is my placebo effect alleviated if the project leader does not know what I am taking either?
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I assume it’s just to eliminate further possible factors that could throw off the results: Such as you somehow learning (or believing to have learned) about the nature of the drug through interaction with people who _do_ know – or even skewed interpretation of the results (such as your verbal feedback) by others
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