The Importance of Controlled Research Trials in Abnormal Psychology Researchers in abnormal psychology are often interested in learning which treatments work for specific disorders. One way to do this is to conduct controlled research trials. In a controlled research trial, participants are randomly assigned to two or more groups. One group receives the treatment being studied, while the other group(s) receive a placebo or no treatment. The placebo is a fake treatment that looks and feels like the real treatment, but it does not contain any active ingredients. This type of study design helps to ensure that any differences between the groups are due to the treatment and not to other factors, such as the participants' expectations or the natural course of the disorder. There are two main types of controlled research trials: Randomized controlled trials (RCTs) are the gold standard for testing the effectiveness of treatments. In an RCT, participants are randomly assigned to the trea...
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