In the Pennebaker experiment concerned with the effects of emotional writing on physical health, the group of participants that wrote only about non-emotional topics was the _______ group.

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The control group in an experiment is the group that does not receive the experimental treatment and is used for comparison. In the Pennebaker experiment, the group that wrote about non-emotional topics served as the control group to compare against those who wrote about emotional topics.

In the Pennebaker Experiment Concerned with the Effects of Emotional