hawthorne effect

Definition: A common biases in research design stemming from a treatment's unintended effects related to special attention, novelty, or similar treatment co-occurrences that influences research participants' behavior.

The Hawthorne effect refers to the phenomenon where individuals change their behavior in response to being observed or studied. This effect often leads to temporary improvements in performance, as participants may work harder or behave differently simply because they know they are being watched.
(Wikipedia)

Suter, W. (2012). Ch. 7, pg. 186-216. Introduction to Educational Research: A Critical Thinking Approach. SAGE Publications, Inc.https://doi.org/10.4135/9781483384443