The fact that research participants may become fatigued or bored in the course of an experiment introduces a confound called:

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Maturation refers to changes that occur naturally over time, such as participants becoming fatigued or bored in the course of an experiment. This can introduce a confound that affects the validity of the results. History, mortality, and statistical regression refer to different types of confounds that may arise in an experiment.

The Fact That Research Participants May Become Fatigued or Bored