In 1939, University of Iowa researcher Wendell Johnson wanted to prove stuttering was learned, not genetic. So he took 22 orphans and deliberately tried to make half of them stutter—through psychological abuse. It worked. The children were traumatized for life. The study was hidden for 60 years.
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🔬 The Experiment
Subjects: 22 orphans (ages 5-15)
Groups:
- Group 1: Praised for speech (positive reinforcement)
- Group 2: Criticized harshly for any speech imperfection
Group 2 treatment:
- “You’re beginning to stutter”
- “Don’t speak unless you can do it right”
- Constant negative feedback
- Psychological abuse
Duration: 6 months
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😱 Results
Group 2 children:
- Developed speech problems
- Became withdrawn
- Lost confidence
- Lifelong psychological damage
One victim (Mary Tudor, researcher’s assistant) said:
- “I had to destroy these children’s lives”
- Felt guilt for decades
Nickname: “The Monster Study” (colleagues’ term for its cruelty)
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🚨 Cover-Up and Exposure
1939: Study completed, never published
1940s-1990s: Hidden from public
2001: San Jose Mercury News exposed it
2007: University of Iowa apologized, paid $925,000 to victims
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💡 Scientific Value vs. Ethics
What it proved:
- Negative reinforcement CAN cause speech problems
- Psychological abuse has lasting effects
Cost:
- Ruined lives
- Violated basic ethics
- Damaged trust in research
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The Monster Study: when the pursuit of knowledge becomes monstrous!