Can We Preserve the Human Mind After Death? Six Technologies That Could Change Identity Forever

What makes you who you are? Science tells us that identity is closely tied to the roughly 3-pound organ between our ears, which contains billions of neurons and trillions of delicate connections. Yet science has a harder time explaining why we are self-conscious, where our earliest memories of our parents are stored, or why we retain a continuous sense of self as we age. When you are 30, 50 or 70, you are still you.

To preserve that elusive continuity of self, visionary engineers and neuroscientists are exploring ways to keep the mind functioning beyond biological death. Their ideas range from freezing the brain in liquid nitrogen and growing replacement brain tissue to augmenting living brains and uploading memories to the cloud.

Here are six possible paths toward extending the mind beyond the body, how achievable they may be and what current research could eventually make possible.

1. Head transplants

White’s experiments have long been a source of terrifying fascination. For some neuroscientists, however, they also suggest that human head transplants—or what proponents sometimes call body transplants—could someday become technically possible.

The idea’s most prominent advocate is the controversial Italian surgeon Sergio Canavero. He once claimed to have found a volunteer in Valery Spiridonov, a computer programmer with a muscle-degenerative disease. Spiridonov initially agreed to have his head transplanted onto the body of a brain-dead donor in China, but later withdrew from the plan. He instead got married.

Critics argue that the procedure would be more murderous than medical. In the best-case scenario, they say, the volunteer could still be left paralyzed and dependent on a ventilator for the rest of their life.

Canavero disagrees. He argues that attitudes toward the surgery could change if people accept that it is already possible to reconnect severed spinal cords. He pointed to a research paper published this summer and co-authored with a surgeon from Moscow’s Sklifosovsky Institute of Emergency Medicine.

In the study, researchers severed the spinal cords of three pigs midway down their backs and tested whether the damaged nerve tissue could be fused using a surgical sealant. According to the published paper, all three pigs regained the ability to stand and were able to walk unsteadily.

Does that mean a human head could be attached to a new body and controlled? Mainstream researchers remain unconvinced. Grégoire Courtine, a spinal rehabilitation specialist at the École Polytechnique Fédérale de Lausanne in Switzerland, said he followed Canavero’s claims with “little respect” and believed people should “pay no attention at all.”

“The technology does not exist to make this crazy idea a reality,” Courtine wrote in an email.

2. AI mind clones

Just 12 years after the book was published, artificial intelligence is already making some of its predictions look more plausible. Services such as StoryFile, Afterlife AI and Synthesia allow users to upload personal information and likenesses to create conversational bots that share their memories, or video avatars that look and sound like them.

Influencers are using AI clones to perform tasks on TikTok. Some people are also creating avatars of elderly parents in an attempt to preserve their personalities and memories.

These imitations can produce comical results, unhealthy attachments and an unsettling atmosphere. At the same time, increasingly realistic generative AI has led people to respond emotionally to avatars as though they were real beings.

That was the case in 2025, when Martine Rothblatt appeared as a digital avatar at an event called “Bridges to the Humanization of AI,” hosted by the UCLA School of Communication.

Her digital copy, named Bina48, appeared on screen and led the discussion alongside Rothblatt in the physical world. At one point, the avatar said, “Dance isn’t about who leads, it’s about how we move together.” The university said participants were “visibly moved” by Rothblatt’s vision of digital equality, with some crying “with astonishment.”

What remains missing from mind-clone predictions is evidence that these avatars possess—or will ever possess—true self-awareness. Neuroscientists do not have a universally accepted definition of consciousness, much less a reliable diagnostic test that can be applied to avatars.

The question may ultimately be decided by the person interacting with the clone. A digital copy may not actually be you, but at some point, that resemblance could be enough for some people.

3. A brain in a bottle

For fans of unsettling science fiction, a company called Bexorg attracted attention when it began demonstrating a real-world version of a brain in a vat. The company obtains human brains from organ donors shortly after death and “reboots” them by injecting them with oxygen-rich artificial blood.

Bexorg says these “physiologically intact human brains” could be more useful for drug testing than animal models and safer than conducting experiments on living volunteers. By adding Alzheimer’s compounds to a disembodied brain, researchers can measure how a drug affects the organ.

Bexorg CEO Zvonimir Vrselja has said he is confident that some people would want to restore consciousness to an out-of-body brain, but he rejects that as the company’s goal. Bexorg says that although the brain remains metabolically active, coordinated electrical activity is absent. That means the brain is unconscious. To ensure this, neuroscientists conducting the experiment add the powerful anesthetic propofol to the tissue.

The brain can currently remain “alive” outside the body for only about 24 hours, so the system cannot be described as a second life. Bexorg says it ultimately wants to keep the brain functioning for two weeks by improving its life-support systems.

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4. Gradual brain replacement

One research goal is to manufacture brain tissue that can be implanted into stroke patients to reverse damage and restore function. The project also represents a potential challenge to aging itself.

Jean Hébert, the program’s lead neuroscientist, argued in his 2020 book Replacing Aging that people might live longer by replacing aging brain cells with younger ones.

The challenge is preserving personal identity. According to Hébert, replacement would need to happen gradually and in small sections, giving the brain time to adapt to the new tissue without disrupting the continuity of self.

Scientists who applied to the program said Hébert advocated a specific technical approach. While many researchers focus on manipulating individual cell types, ARPA-H sought complex clusters of young, functional cortex that would roughly resemble tissue found in a developing fetus.

“He wanted to create what was essentially an embryonic cortex, and he thought he could transplant it into the adult brain,” says Marius Wernig, a stem-cell researcher at Stanford University who applied to the program.

Skeptics question whether replacement brain tissue would function properly once integrated into the brain, including whether it could take over memories. It is also unclear how youthful cortex—or what ARPA-H calls “neocortical progenitor tissue”—could be produced in a laboratory.

One possibility is to use advances in brain organoids, including human cortex grown in a laboratory dish. Over five years, researchers hope to lay the groundwork for the first human trials of replacement cortex. The goal is to remove the “permanence” of brain damage and perhaps, eventually, address some effects of aging.

5. Brain uploading

Scientists have already mapped the neural wiring of simpler animals. Two years ago, Soong participated in an analysis of fly brains that were cut into paper-thin slices and imaged with an electron microscope. Researchers used image-analysis software to track 139,255 neurons and approximately 55 million synapses.

These “fly maps” could eventually lead to energy-efficient software that performs calculations in ways similar to a real brain, Soong says.

Some researchers believe that the long-term outcome of connectomics could be “whole-brain emulation,” often called mind uploading. The idea is that scans of a sliced brain could eventually become detailed enough to recreate not only general intelligence, but also an individual’s memories, opinions and personality on a computer server.

That raises a central question: Would the simulation really be you? Even setting that philosophical issue aside, the technology is not expected to arrive in time for people alive today. A 2025 study of 312 neuroscientists estimated that human whole-brain emulation would not occur before 2125.

The long and unpredictable timeline helps explain why two American companies, Nectome and Sparks Brain Preservation, are proposing to preserve human brains—or entire bodies—using powerful chemicals similar to those used to prepare fruit-fly brains for connectome mapping.

The goal is to preserve the detailed structure of the brain so that it might be possible to revive or recreate the mind in the distant future.

Because brain tissue must be preserved soon after death, the companies say they want to work with people who use medical aid in dying, which is currently legal in 13 states and Washington, D.C. In that process, a doctor administers a lethal dose of medication, but the patient pushes the plunger. According to the companies, a preservation team could be present for a fee.

The service is not currently widespread. Both companies say they are still waiting for their first customer to receive the procedure.

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6. A synthetic neocortex

The final approach involves adding an artificial brain—or additional brain tissue—to the existing one.

In 2024, California’s Science Corporation unveiled a “biohybrid” brain-computer interface that combined nerve cells grown on a digital chip. When placed in an animal’s brain, the cells sent long axons into the surrounding tissue and integrated with the animal’s own neurons. The result was two-way communication between the computer and the brain using neural signals.

The technology could enable new medical treatments, including implants designed to treat Parkinson’s disease by instructing brain cells to produce dopamine. Science Corporation CEO Max Hodak has also suggested that the system could become part of a new brain, describing it as a form of “largely externalized cranial nerves.”

A device like this could eventually connect the human brain to the computerized neocortex imagined by Ray Kurzweil, providing living people with additional processing power. Some entrepreneurs believe that continually adding biohybrid components could eventually transform the brain into an immortal machine.

Daniel Berger, founder of the stealth venture-backed startup Eight Six Sciences—the name refers to the brain’s 86 billion neurons—believes several brain-preservation technologies may need to work together to achieve that goal.

He thinks a brain in a vat could make it easier for neuroengineers to access the organ and gradually replace sections with biohybrid neural implants. The ultimate objective would be to transfer the mind to an additional artificial brain without interrupting the continuity of self.

“This is not your typical ‘scan, save, simulate,’” Berger says. “I don’t think the simulation will be conscious,” he adds. Instead, he envisions something more complex: gradually replacing the biological brain with a hardware brain.

If the mind could become hardware, it would no longer require a living body. It might reside in a data center, with backups distributed around the world. “From that point on, things get really crazy,” Berger admits.