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Children in the control groups who were praised showed no negative effects. One child who already stuttered but received positive feedback actually improved.

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. 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. Children in the control groups who were praised

Mary Tudor concluded her thesis with a disturbing observation: The experiment had succeeded in creating "a condition in the child which seems to be the beginning of a real stuttering problem." When it came to light publicly in the

One child, a boy identified in records as "Case V," was described as a happy, outgoing talker before the study. After being labeled a stutterer, he became withdrawn and refused to speak more than a few words at a time. The damage was permanent.