7 Unethical Human Experiments That Shocked The World

Dec 21, 2023, 16:26 IST

Moohita Kaur Garg

History is full of murky secrets, some of which on coming to light shocked the world. Delving into the darker chapters of scientific history, let’s take a look at some controversial experiments conducted without people’s knowledge or consent. 

Tuskegee Syphilis Study (1932-1972)

This notorious study, carried out by the US Public Health Service, silently observed the progression of untreated syphilis in African-American men without informing them or providing proper treatment, leading to severe consequences. 

MKUltra (1950s-1970s) 

The shadowy world of mind control experiments unfolded in the MKUltra project of the CIA. Subjects including mental health patients, drug addicts, prisoners, often unaware of their involvement, endured psychological trauma through the use of drugs like LSD and sensory deprivation. 

The Stanford Prison Experiment (1971)

Led by psychologist Philip Zimbardo, this study simulated a prison environment, assigning participants as guards and prisoners. Extreme behavioural changes were observed — guards became tyrannical and cruel, while prisoners became depressed and disoriented.

Project Sunshine (1953-1959)

In a US government initiative, tissue samples were collected from deceased individuals, including infants in countries from Australia to Europe, without their families’ knowledge. The goal was to study the effects of nuclear fallout. In one case, a British mother claimed her stillborn baby’s legs were removed and shipped to the US. 

Guatemala Syphilis Experiments (1946-1948) 

Researchers from the United States deliberately infected vulnerable populations in Guatemala, including prisoners and mental health patients, with syphilis and gonorrhoea without their knowledge or consent. 

Radioactive Chapatis (1969) 

In 1969, 21 Indian-origin women in Coventry, United Kingdom were fed, without their knowledge, chapatis containing Iron-59, a radioactive iron isotope. This was reportedly done to verify if it treats anaemia (a disease caused by iron deficiency), common among the city’s South Asian population. 

Facebook Emotional Contagion Study (2012)

In a more contemporary context, Facebook, in 2012, conducted a study on emotional contagion by manipulating the content of users’ newsfeeds to observe the emotional impact. 

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