For decades, the study remained an obscure, shameful footnote in academic circles. When it came to light publicly in the early 2000s, it sparked outrage, lawsuits, and a profound re-examination of research ethics. This is the story of how a well-intentioned scientific inquiry crossed an indelible line. To understand the study, you must understand Wendell Johnson. As a child, Johnson himself was a severe stutterer. This personal struggle drove his academic career; he became one of the most influential speech pathologists of the 20th century at the University of Iowa.
The State of Iowa settled the lawsuit in 2007 for $925,000—a fraction of what was sought, but an official acknowledgment of wrongdoing. The university did not admit liability but expressed "deep regret" for the pain caused. The Monster Study is now a foundational case in the history of research ethics. It directly contributed to the creation of modern Informed Consent rules and the necessity of Institutional Review Boards (IRBs). Today, no university would ever approve an experiment that intentionally harms children, especially by trying to induce a psychological disorder. monsterxxxperiment
In 1939, a young graduate student named Mary Tudor embarked on a research project in Davenport, Iowa, under the supervision of her mentor, famed speech pathologist Dr. Wendell Johnson. Her goal was to test a theory about the causes of stuttering. But the method she used would later earn the experiment a chilling nickname: The Monster Study. For decades, the study remained an obscure, shameful
Children in the control groups who were praised showed no negative effects. One child who already stuttered but received positive feedback actually improved. To understand the study, you must understand Wendell Johnson
