If a participant's behavior is influenced by the presence of an observer, this is called:

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Reactive behavior is behavior that is influenced by the presence of an observer. This can be seen in the Hawthorne effect, where employees improved their productivity when they knew they were being observed during a study. Responsive behavior refers to behavior that is a reaction to a specific stimulus, obtrusive behavior refers to behavior that is intrusive or disruptive, and selective perception refers to the tendency to selectively interpret information to fit one's pre-existing beliefs.

If a Participant's Behavior Is Influenced by the Presence of an Observer