Hawthorne effect

is the tendency to modify one's behavior when aware they are being observed.

The Hawthorne effect (also referred to as the observer effect) is a type of reactivity in which individuals modify or improve an aspect of their behavior in response to their awareness of being observed. The original research at the Hawthorne Works in Cicero, Illinois, on lighting changes and work structure changes such as working hours and break times were originally interpreted by Elton Mayo and others to mean that paying attention to overall worker needs would improve productivity. (wikipedia)

hawthorne effect, n.Definitions

hawthorne effect