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The Hawthorne effect is a specific form of reactivity where people modify their conduct solely because they are aware that a researcher is observing them. This shift in behavior can undermine the validity of observational research since the recorded actions do not reflect the individuals' true, unobserved state.

Hawthorne Effect

During the Hawthorne Studies, researchers observed that productivity improved regardless of the changes made to a variable like lighting. This improvement occurred even when the conditions were made objectively worse, such as reverting to poor lighting, suggesting that the change itself, and the associated attention, was the influential factor.

Original Findings Leading to the Hawthorne Effect

The Hawthorne effect remains a critical consideration in modern experimental design. It is recognized as a potential confounding variable that must be controlled for, as any observed effect might stem from the participants' awareness of being studied rather than the experimental treatment itself. Researchers must design studies to isolate the treatment's impact from the effect of increased attention.

Controlling for the Hawthorne Effect in Experiments

A company's management team wants to test if playing classical music in a factory will increase worker productivity. For one week, they play the music and have supervisors walk the floor frequently to monitor the workers' output. Productivity increases by 15%. The next week, they continue playing the music but remove the frequent monitoring. Productivity levels return to what they were before the experiment began. Which of the following best explains the initial 15% increase in productivity?

A prime example of reactivity and the Hawthorne effect is how an individual might alter their behavior in a social setting, such as a bar, if they know they are being monitored. This awareness causes them to act differently than usual, thereby invalidating the observational study.

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