Sometimes a subject's expectations may lead to behaviour change in the absence of any effective treatment. This is referred to as an example of

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The placebo effect refers to the change in a subject's behaviour or symptoms that occurs due to their belief in the effectiveness of a treatment, even if the treatment itself is inactive or ineffective. This can be a powerful factor in research studies and clinical trials, as it can lead to an overestimation of treatment effects if not properly controlled for.

Sometimes a Subject's Expectations May Lead to Behaviour Change in the Absence