Hawthorne effect
The Hawthorne effect is a form of reactivity.[clarification needed] When the group which is under study knows about the study and their behavior changes after knowing that they are being studied, this change of behavior is the Hawthorne effect.
Examples
A group of 10 are being studied for their health after exercising. Without knowing that they are being studied, they do or not do exercise, but after knowing that they are being studied they regularly do exercise.
Hawthorne Effect Media
Aerial view of the Hawthorne Works, c. 1925
