When treatment group members compare their situation to that of the control group members who are not receiving the treatment; experimental group members feel special simply because they are in the experiment.This effect is known as

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The effect described is known as the Hawthorne effect, named after a series of experiments conducted at the Hawthorne Works factory in the 1920s. Workers who were being studied and observed during the experiments improved their productivity simply because they were being observed and felt special as a result. This same effect can occur in experimental settings when participants in the treatment group feel special because they are receiving a particular treatment, while the control group is not.

When Treatment Group Members Compare Their Situation to That of the Control