John Henry effect
In a controlled social experiment if a control is aware of their status as members of the control group and is able to compare their performance with that of the treatment group, members of the control group may actively work harder to overcome the "disadvantage" of being in the control group.
For example, if in an educational trial where the school classes who are in the treatment receive an extra support teacher, students who are in the control group may be induced to work harder to overcome that disadvantage.
The term was first used by Gary Saretsky (1972) to describe the behavior of John Henry, a legendary American steel driver in the 1870s who, when he heard his output was being compared with that of a steam drill, worked so hard to outperform the machine he died in the process.
- Cook, Thomas D.; Campbell, Donald Thomas (1979). Quasi-experimentation: Design & Analysis Issues for Field Settings. Boston: Houghton Mifflin. p. 55. ISBN 9780395307908.
- Saretsky, Gary (1972). "The OEO P.C. Experiment and the John Henry Effect". The Phi Delta Kappan. 53 (9): 579–581. JSTOR 20373317.