The “Monster Experiment” was conceived by and conducted under the supervision of Dr. Wendell Johnson, one of the nation’s most prominent speech pathologists. The experiment induced stuttering in twenty-two children living at the Iowa Soldiers’ Orphans’ Home in Davenport. It was designed to test Dr. Johnson’s theory about the cause of stuttering, using psychological pressure to induce children who spoke normally to stutter. The experiment was uncovered by Jim Dyer who had been a graduate student at the University of Iowa in 2001.
* https://ahrp.org/article-24/