A lobotomy is a surgical procedure that severs nerve connections in the brain’s prefrontal cortex, the region responsible for personality, decision-making, and complex thought. Surgeons cut the white matter fibers linking the prefrontal cortex to deeper brain structures, particularly the thalamus, which acts as a relay station for sensory and emotional signals. The goal was to calm patients with severe, untreatable mental illness. Roughly 50,000 lobotomies were performed in the United States between 1936 and 1972, most of them on people confined to overcrowded psychiatric institutions.
How the Procedure Worked
The prefrontal cortex sits behind your forehead and handles planning, impulse control, emotional regulation, and social behavior. It communicates with the rest of the brain through dense bundles of white matter, nerve fibers that carry signals between regions. A lobotomy physically cut those fibers, disconnecting the prefrontal cortex from the thalamus and other structures involved in processing emotions. The theory was that severing these connections would interrupt the loops of disordered thought and overwhelming emotion seen in conditions like schizophrenia and severe depression.
Early versions of the surgery, developed by Portuguese neurologist Egas Moniz in 1935, involved drilling holes in the skull and inserting a specialized cutting instrument to destroy targeted tissue. Moniz called the procedure a “leucotomy,” referring specifically to the cutting of white matter. American neurologist Walter Freeman later popularized a faster, cruder version: the transorbital lobotomy. In this approach, a thin, ice-pick-like instrument was inserted through the eye socket above the eyeball, then swept side to side to sever frontal lobe connections. It could be done in minutes, without a traditional operating room, which made it alarmingly easy to perform on large numbers of patients.
Who Received Lobotomies and Why
Lobotomies were performed primarily on people with chronic schizophrenia and severe depression who had been hospitalized for years, often in institutions that were dangerously overcrowded and understaffed. In the 1940s and early 1950s, there were no effective psychiatric medications. Options for treating serious mental illness were limited to electroconvulsive therapy, insulin-induced comas, and long-term institutionalization. Against that backdrop, a surgical procedure that could make patients “calm and manageable” seemed like progress.
The procedure gained swift popularity in the late 1940s and early 1950s. At the peak of the lobotomy boom in 1950, 94% of procedures were performed in public or state-run facilities rather than private settings, reflecting how heavily the surgery was used on institutionalized populations with little say in their own care. Moniz received the 1949 Nobel Prize in Physiology or Medicine for developing the procedure, which the Nobel Committee described as “one of the most important discoveries ever made in psychiatric medicine.” That recognition lent enormous credibility to the practice, even as troubling outcomes were already becoming apparent.
Side Effects and Long-Term Damage
The consequences of lobotomy were severe and often permanent. A decade-long follow-up study of 150 patients who received prefrontal lobotomies between 1948 and 1952 found that 91% developed a lasting personality defect. That number is striking: the vast majority of patients came out of the procedure fundamentally changed. They often became passive, emotionally flat, and unable to plan or take initiative. Many lost their sense of humor, their creativity, and their ability to navigate social situations. Some became childlike or impulsive.
The same study found that 67% of patients improved enough to leave the hospital, which was considered a success at a time when the alternative was indefinite institutionalization. But 26% of those discharged eventually relapsed and needed further treatment. Twelve percent of patients developed epilepsy as a direct complication of the surgery. The maximum benefit, such as it was, typically appeared about six months after the operation and then held steady.
One of the most well-known cases illustrating the procedure’s devastating potential is Rosemary Kennedy, the eldest daughter of the Kennedy family. After her lobotomy in 1941, performed when she was 23, she immediately lost most of her ability to walk or talk. Her personality was permanently altered, and she was left physically disabled for the rest of her life, requiring full-time care in an institution for decades.
Why Lobotomies Stopped
The single biggest factor in ending the lobotomy era was the arrival of chlorpromazine, the first antipsychotic medication, in the mid-1950s. Chlorpromazine could reduce hallucinations, delusions, and agitation without surgery, and it launched what researchers call the “psychopharmacological era.” It replaced not only lobotomies but also insulin comas and other extreme biological treatments that had been standard practice. For the first time, doctors had a tool that could manage psychotic symptoms and be adjusted or stopped if it wasn’t working.
Growing ethical concerns also played a role. As the long-term damage to lobotomy patients became harder to ignore, and as journalists and advocates began drawing public attention to the conditions in psychiatric institutions, the medical community started to turn against the procedure. The last lobotomies in the U.S. were performed in the early 1970s.
Legal Status Today
Lobotomies in their original form are no longer performed anywhere in mainstream medicine. Several jurisdictions have gone further and banned psychosurgery outright or placed strict legal restrictions on it. In Australia, New South Wales and the Northern Territory prohibit psychosurgery regardless of technique or patient population. Queensland bans performing psychosurgery on another person entirely. Japan’s psychiatric society passed a resolution against psychosurgery in 1975. In Canada, Ontario prohibits psychosurgery on anyone incapable of consenting, and Newfoundland and Labrador ban it on involuntarily hospitalized patients. California prohibits psychosurgery on minors. Several Australian states and New Zealand set minimum age requirements of 16 or 17.
Modern Psychiatric Brain Surgery
The lobotomy’s legacy did not end brain surgery for psychiatric conditions entirely, but it transformed the field beyond recognition. Modern procedures target tiny, precisely mapped areas of the brain using MRI-guided stereotactic techniques, a far cry from sweeping an ice pick through the frontal lobes.
Deep brain stimulation (DBS) is the most significant modern alternative. It involves implanting thin electrodes into specific brain regions and delivering controlled electrical pulses from a battery pack placed under the skin, similar to a pacemaker. The critical difference from a lobotomy is reversibility: if DBS doesn’t work, the device can be turned off and removed. Stimulation can also be stopped temporarily to assess whether it’s still needed. DBS is being used or studied for severe obsessive-compulsive disorder, treatment-resistant depression, and addiction.
Lesion-based surgeries still exist in limited form. Procedures like cingulotomy (for OCD, depression, and addiction) and anterior capsulotomy (for OCD and depression) destroy very small, specific targets identified through imaging. These are irreversible, but they affect a fraction of the tissue that a lobotomy destroyed. Gamma Knife radiosurgery offers another option, using focused beams of radiation that converge on a single mapped point in the brain without opening the skull at all. These modern approaches are reserved for patients who have not responded to years of medication and therapy, and they require informed consent and extensive evaluation, safeguards that did not exist during the lobotomy era.