Science advances through bold theory and daring experimentation. In this roundup of 10 extreme cases of self‑experimenting, we dive into the wild, risky, and sometimes gruesome lengths researchers have gone to prove a point.
10 Extreme Cases of Self‑Experimentation
10 Pain
Pain is notoriously slippery to measure, yet we all know someone who could lose a limb without flinching while we sob over a paper cut. To tame this slippery beast, entomologist Justin Schmidt decided to become his own test subject, deliberately exposing himself to a spectrum of stinging insects. He rated each sting on a scale from 0 (no effect) to 4 (excruciating), supplementing the numbers with vivid verbal portraits of the agony. His own encounter with a Pepsis wasp earned a description of “Immediate, excruciating pain that simply shuts down one’s ability to do anything, except, perhaps, scream,” illustrating just how personal and brutal a pain‑scale can become.
9 Cholera
Max von Pettenkofer, a towering figure in 19th‑century German hygiene, was convinced that cholera required more than a mere germ; he argued that soil conditions transformed Vibrio cholerae into a deadly miasma. To test his theory, he swallowed a pure broth teeming with cholera bacteria. Though he felt a touch ill, he escaped the classic torrent of vomiting and watery diarrhea that usually spells death. Pettenkofer’s self‑inflicted infection highlighted a key limitation of lone self‑experiments: a single data point cannot settle a scientific debate.
8 Food
Since humanity first learned to chew, the obvious fact has been that we need food. The puzzling question, however, is what becomes of that food after it passes our lips. In the early 1600s, the physician Sanctorius took a radical approach: he built a weighing chair and meticulously logged the weight of every morsel he ate, his own body weight, and every ounce of excrement for three decades. His painstaking calculations revealed a startling ratio—about eight pounds of food yielded only three pounds of waste. He dubbed the mysterious loss “insensible perspiration,” a term that hinted at a hidden metabolic process. Sanctorius’s lifelong commitment to weighing his own outputs is a testament to the lengths a scientist will go when the subject is, quite literally, themselves.
7 Infectiousness
Yellow fever, a virus spread by mosquitoes, still claims tens of thousands of lives each year despite an effective vaccine. In the 19th century, young medical student Stubbins Ffirth was convinced the disease could not be transmitted between people. To prove his point, he turned his own body into a laboratory, sipping vomit from infected patients, smearing it into cuts, and even dousing his eyes with the sickly fluid. None of these grotesque exposures produced a fever. Unaware that his samples came from patients long past the infectious stage, Ffirth published a confident, yet tragically mistaken, claim that yellow fever was non‑contagious.
6 Electrical Stimulation
The birth of electricity sparked a frenzy of experiments to uncover its role in living tissue. Johann Wilhelm Ritter, famed for discovering ultraviolet light, decided to move beyond dead specimens and tinker with his own nerves. He applied electric charges to various body parts, documenting each reaction. The most sensational result came when he directed a Voltaic pile’s current to his genitals, inducing an intense orgasm. Ritter’s enthusiasm bordered on the childlike; he joked about marrying his battery and endured repeated shocks that sometimes required morphine for relief, likely shortening his own lifespan.
5 Surviving Submarines
War has historically supplied a grim laboratory for medical inquiry, but it also inspired scientists to prevent future tragedies. Evolutionary theorist J. B. S. Haldane, inheriting a penchant for daring from his father, sought to understand the physiological shock a submarine crew might endure after a wreck. He subjected himself repeatedly to a decompression chamber, mimicking rapid pressure changes. The experiments illuminated nitrogen narcosis and the bends, while Haldane emerged with only minor ear‑drum perforations—injuries he dismissed with a wry remark about smoking tobacco through the hole as a social trick.
4 Upside Down World
Our perception of reality hinges on the eyes, prompting psychologist George Stratton to ask what would happen if vision were flipped upside down. He crafted a pair of glasses that inverted the visual field, turning sky into floor and vice versa. The initial experience was nauseating, but after several days his brain adapted, and he reported that the inverted scene now felt “right side up.” When he finally removed the lenses, the world appeared upside down to him. Subsequent attempts to replicate his sense of normality have failed, yet the experiment underscores the brain’s astonishing capacity to remodel sensory input.
3 Hanging Sensation
Nicolae Minovici was driven by a morbid curiosity: what does the act of hanging truly feel like? While most of us would settle for “not pleasant,” Minovici wanted empirical certainty. He arranged for assistants to hoist him repeatedly with various nooses, enduring the severe pain that lingered for weeks after each trial. Though his self‑inflicted torment provided personal insight, it did not illuminate the experience of a condemned prisoner who dies from a swift drop and a broken neck.
2 Heart Catheter
When physicians needed direct access to the beating heart, they faced a perilous dilemma: opening the chest was often fatal in the early 20th century. Werner Forssmann, intrigued by the possibility of threading a thin tube through blood vessels into the heart, decided to become his own subject. He sliced open his own arm, guided a catheter up to his heart, and then, with the device dangling from his limb, walked to an X‑ray suite to confirm its position. The daring self‑experiment earned him a share of the 1956 Nobel Prize in Medicine.
1 Stomach Ulcers
Lab safety rules famously forbid eating or drinking in the workplace, yet two daring researchers broke that rule to solve a medical mystery. Stomach ulcers were once blamed on stress, but Barry Marshall and Robin Warren suspected a bacterial culprit, Helicobacter pylori. To prove their hypothesis, Marshall ingested a culture of the bacterium. He soon developed gastritis, confirming that H. pylori could indeed cause ulcers. Their breakthrough paved the way for antibiotic treatments and earned them the 2005 Nobel Prize in Physiology or Medicine.