A lobotomy severs the nerve fibers connecting the frontal lobes of the brain to deeper structures, particularly the thalamus. The result, in most cases, was a dramatic and permanent change in personality. A follow-up study of lobotomy patients published in the Canadian Medical Association Journal found that 91% developed a lasting personality defect, and 12% developed epilepsy. The procedure was meant to calm severe psychiatric symptoms, but it often did so by flattening the very qualities that made a person who they were.
What the Surgery Actually Did to the Brain
The frontal lobes are responsible for planning, decision-making, emotional regulation, and social behavior. A lobotomy worked by cutting the white matter tracts that carry signals between these frontal regions and the thalamus, a relay station deep in the brain that helps coordinate sensory input and emotional responses. A surgeon would insert a blade-like instrument called a leucotome through holes drilled in the skull and sweep it through the brain’s white matter in a fan-shaped motion, severing those connections.
Once those pathways were cut, the frontal cortex was essentially isolated. It could no longer receive direct input from the thalamus or communicate efficiently with the rest of the brain. Whatever activity remained in the frontal lobes had to find expression through indirect, roundabout routes, because the direct pathways were gone. This is why the effects were so sweeping: the surgery didn’t target a single symptom. It disrupted the entire network that governs personality, motivation, and higher-order thinking.
How a Person Changed Afterward
The most visible change in a lobotomized person was emotional blunting. Patients who had been agitated, anxious, or violently distressed before the procedure often became passive, docile, and indifferent. For doctors working in overcrowded psychiatric institutions in the 1930s and 1940s, this was considered a success. The patient was quieter and easier to manage.
But that calm came at an enormous cost. Patients typically lost their initiative, their ability to plan ahead, and much of their emotional depth. They might laugh or cry at inappropriate moments, show little interest in activities they once cared about, or struggle to follow through on even simple tasks. Abstract thinking and problem-solving deteriorated. Many patients could handle basic self-care but were unable to hold jobs or live independently. Some became childlike in their behavior, impulsive without being aware of it, or eerily apathetic about their own lives and the people around them.
The severity of these changes varied depending on how much brain tissue was destroyed. Surgeons performing the procedure on patients with mood disorders like depression tended to make cuts more toward the front of the brain, while those treating schizophrenia cut further back. But the procedure was remarkably imprecise. Surgeons were working blind, sweeping a blade through tissue they couldn’t see, with no imaging to guide them. The amount of damage was inconsistent from patient to patient, which is one reason outcomes ranged from mild personality changes to complete incapacitation.
Physical Complications and Death
Beyond personality changes, the surgery carried serious physical risks. Between 10% and 35% of patients developed epilepsy after the procedure, often originating in the frontal lobes where the surgical damage was concentrated. These seizures could be severe, with some patients experiencing clusters of convulsions that started with a sudden scream, a pattern consistent with frontal lobe epilepsy.
The risk of dying from the procedure itself was staggering by modern standards. Depending on the surgical technique used, the mortality rate ranged from 6% to 27%. Patients died from bleeding in the brain during or after surgery, from uncontrollable seizures, or from sudden unexpected death related to epilepsy. For a procedure performed on tens of thousands of people, those numbers represent an enormous toll.
The Transorbital “Ice Pick” Method
The version of the lobotomy that became most widespread, and most notorious, was the transorbital technique developed by psychiatrist Walter Freeman in 1946. Rather than drilling holes in the skull, Freeman inserted a thin, pointed instrument resembling an ice pick through the eye socket, above the eyeball, and into the brain. He would then sweep the instrument side to side to sever the frontal lobe connections.
The procedure took only minutes. Patients were sedated with an electroconvulsive shock rather than general anesthesia, making it possible to perform the surgery in a doctor’s office rather than an operating room. Freeman traveled the country performing transorbital lobotomies, sometimes doing dozens in a single day. This speed and simplicity helped the procedure spread rapidly through state psychiatric hospitals. By 1951, an estimated 18,000 lobotomies had been performed in the United States alone. A 1950 global estimate put the total at around 10,000 outside the U.S., though that number was likely an undercount.
Who Was Lobotomized and Why
Lobotomy was developed in the 1930s to address what was then an unsolvable problem: massive overcrowding in psychiatric institutions with no effective treatments available. The primary targets were patients with severe schizophrenia and major depression who had been hospitalized for years. But the criteria for the procedure were loose, and over time, lobotomies were performed on people with anxiety, obsessive-compulsive behavior, and other conditions that would be treated very differently today. Some patients were children. Many had no ability to consent.
Portuguese neurologist Egas Moniz received the Nobel Prize in 1949 for developing the original frontal leucotomy technique, lending the procedure an air of scientific legitimacy. That recognition came even as evidence of devastating side effects was mounting.
Why the Practice Ended
The lobotomy era effectively ended in the mid-1950s with the introduction of the first antipsychotic medications. These drugs could reduce hallucinations, agitation, and psychotic symptoms without destroying brain tissue. Once a chemical alternative existed, the justification for irreversible brain surgery collapsed quickly. By the 1960s and 1970s, lobotomy was widely regarded as a medical catastrophe.
What Replaced It
Modern psychiatric neurosurgery still exists, but it bears almost no resemblance to the lobotomy. Procedures like cingulotomy and subcaudate tractotomy use stereotactic frames and brain imaging to create tiny, precisely targeted lesions in specific brain circuits. Cingulotomy, for example, interrupts a small bundle of fibers in the anterior cingulate gyrus, a structure involved in obsessive-compulsive loops. These surgeries are reserved for patients with severe OCD or depression that has not responded to any other treatment, and they affect only the specific pathological circuit rather than disconnecting entire brain regions. The result is meaningful symptom relief for some patients with far fewer side effects than the crude, sweeping cuts of the lobotomy era.