According to the Hawthorne effect,:

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The Hawthorne effect is the phenomenon where individuals modify or improve an aspect of their behavior in response to their awareness of being observed. The original studies at the Hawthorne Works in the 1920s and 1930s observed that workers' productivity increased when changes were made to their work environment, such as lighting adjustments, and when they received attention from researchers. This led to the conclusion that workers respond positively to the attention itself, rather than the physical changes in the workplace.

According to the Hawthorne Effect