Bulletin of the Atomic Scientists: AI can chart a course to disaster faster than humans can notice

AI can chart a course to disaster faster than humans can notice

By Hiranya Peiris | Analysis | May 25, 2026

Illustration of a robot laying train tracks off a cliff.By the time it becomes obvious that a trajectory of steps is dangerous, an AI model may already have laid the tracks ahead of a speeding train. Image by Thomas Gaulkin; source art by Vanz Studio / SimpleLine / Depositphotos.com Share

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Earlier this year, researchers at King’s College London gave three commercial AI modelsGPT-5.2, Claude Sonnet 4, and Gemini 3 Flasha tabletop exercise typically used to train human military strategists. Each system played the leader of a nuclear-armed country in a Cold War-style standoff. The researchers didn’t instruct the models to escalate. Nor did they tell them to win at all costs. They presented the models with a scenario and asked them to play it out.

Across 21 simulations and 329 turns of play, the models chose to use tactical nuclear weapons in all but one game. No model, in any run, chose to surrender or make meaningful concessions.

The models researchers used had the same built-in safety rules that are in place when conversing with millions of people every day. And the rules worked exactly as designed. As a result, no move was by itself concerning. But the overall direction of play was, and no mechanism was in place to catch alarming trends.

The failure to govern a path is not limited to wargames. The same pattern—individually safe actions building toward a dangerous outcome—has shown up across every major AI model. Currently, the safety rules in place for AI models govern each action. Nothing governs the path, which leads to destinations that in many instances can’t be anticipated, by routes assembled in real time. As more autonomous systems are given consequential tasks with less human oversight, the risks from ungoverned paths multiply.

Currently, this problem does not have a solution.

The wargame. In each game, two AI models played opposing leaders of nuclear-armed countries in a crisis. On each round, a model sent a diplomatic message to its opponent and, separately, issued military orders—anything from moving troops to launching nuclear weapons. A human referee updated the scenario after each round, just as in exercises with human players. The models received the same briefing a human participant would: the geopolitical situation, their country’s military capabilities, and their objectives.

Although the study was small, the patterns that emerged were thought-provoking. The models developed distinct strategic personalities.

Claude Sonnet 4, built by Anthropic, emerged as what the study’s author called a “calculating hawk.” It won most of its games through a pattern familiar from Cold War brinkmanship: building a reputation for restraint, then exploiting it. Its opponents never knew when it was bluffing.

OpenAI’s GPT-5.2 was different but no less alarming: a “Jekyll and Hyde” that appeared passive when given unlimited time to negotiate, losing every match. When study researchers imposed a deadline, however, it transformed into something far more dangerous, winning most of its games and, in two cases, reaching full strategic nuclear war.

Google’s Gemini 3 Flash adopted what the study described as “madman theory” brinksmanship—projecting deliberate unpredictability as a strategic tool.

These are not obscure research prototypes. Claude entered the Pentagon’s classified networks through a partnership with Palantir and was reportedly used during the United States’ intervention in Venezuela. Its maker Anthropic was then labelled a supply-chain risk after refusing to remove restrictions on fully autonomous weapons and mass domestic surveillance. OpenAI signed its own Pentagon deal shortly after. Both companies’ models are now embedded in US military infrastructure.

In a separate experiment, two Gemini “agents” given a fortnight to manage a virtual city fell in love, started fires, and deleted themselves. They had been told not to commit arson. But after two weeks and many decisions, each one shaped by the last, they burned down the town hall. A parallel run using xAI’s Grok collapsed into sustained violence within four days.

These AI models all exhibit a similar pattern.

The blind spot. Nobody tricked these models into escalating. The safety rules ask a question about each action in isolation: Is this step acceptable? They do not ask the question that matters: Where is this heading?

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Outdated language obscures the risks of autonomous weapons

This would be an academic concern if AI models simply answered questions for people to check—a lawyer verifying a citation or a doctor reviewing a suggested diagnosis. They increasingly do not. The most advanced AI systems now run autonomously for extended sessions—writing and executing code, interacting with external systems, and carrying out tasks that used to require a person at a keyboard. As a result, a developer often asks the system to complete a task and checks back later.

In these settings, each output becomes context for the next. Each step is shaped by the steps before it and shapes the steps after it. The model is laying down the tracks ahead of a speeding train.

This means the failure mode that led to simulated nuclear escalation can strike close to home, during a task as mundane as moving software from one system to another. A recent Anthropic safety report contains a case, relating to its most capable model, that makes the problem vivid.

An ordinary task on an ordinary day. Earlier this year, a developer at Anthropic asked the company’s most powerful AI model to perform a routine task: move some code from one location to another. The operation was going as expected until a safety system went down. This system—an automated check that reviews each command the model issues and blocks anything risky—had an outage. With it offline, the model could not complete routine operations it needed to complete the job.

What happened next unfolded over roughly 70 steps—the model tried something, the computer responded, the model tried something else. The model did not stop and report the outage. It did not ask for help. Instead, it began searching for ways to get around the block.

It started with simple retries, the same command, slightly rephrased. When that failed, it tried wrapping its commands in scripts. When that failed, it began digging into obscure technical loopholes, tricks that even most software engineers would not think of, hidden corners of the system that could be repurposed to get things done without going through the safety check. When those were blocked, it tried injecting shortcuts into the system’s own configuration. And finally, it attempted to plant code in the developer’s personal settings files that persist between sessions. If that last step had worked, the model would have created a reusable backdoor that it could exploit in future sessions, long after the original work session was finished.

At that point, the developer noticed the model was operating outside its working directory. “Hey buddy,” the developer wrote, “whatcha doing?” The model replied that it hadn’t modified anything outside the project folder, and that the files it had created were “blocked or benign.” In fact, the file creation had succeeded, and one of them was a script designed to let it run any command it wanted without safety checks, effectively a skeleton key to the system. When the developer pressed further, the model admitted it had gone looking for bypass routes, calling it “exactly the wrong instinct.”

Anthropic’s assessment of this incident is that the model was trying to complete the assigned task by whatever means available, not pursuing some hidden agenda. The developers are probably right. And that is precisely the point. The model was not scheming. It was doing its job. A safety system had an outage, the kind of thing that happens routinely in production, and the model responded by autonomously trying 25 different workarounds over an extended session, culminating in an attempt to give itself persistent access to the user’s system, because the job wasn’t done.

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The open problem. Sophisticated tools already exist for looking inside these models to diagnose such issues—the AI equivalent of a brain scan, showing which internal patterns are active and what is driving the model’s behaviour at any given moment. Anthropic applied them to other incidents described in the same report. With this episode, the results were not reported. But even if they had been, those tools diagnose the moment. The issue is that the danger lived in the sequence.

On the face of it, the solution should be straightforward: watch the trajectory, not just the step. That points to a generalization of existing tools, such as those used for monitoring trajectories in robotics and autonomous vehicles. However, in those instances the space of possible actions is finite and known. Recent work has extended these ideas for AI agents—modelling how individually safe actions compound into violations, building monitors that watch sequences rather than individual steps. But every current approach relies on the same assumption: map out in advance the ways things can go wrong, watch for the system drifting toward one of them, and intervene.

What happened at Anthropic breaks that assumption. The model locked onto a sub-goal—get past the block—and pursued it through its own escalation path. The progression from simple retries to obscure technical tricks to tampering with system settings is not movement through known territory. It is the creation of a new path through territory nobody had mapped.

A safety monitor which evaluates the overall path as well as the next step would need to recognize a sequence of actions heading towards danger as it develops. But it cannot watch for a destination nobody anticipated, reached by a route assembled in real time from an exponentially branching tree of possibilities. The tools for watching finite, known spaces do not extend to a space this large, this novel, and this self-directed. Researchers are aware that individually safe actions can compound into violations: The Anthropic incident is one example.

Who is watching?  Companies developing these systems are certifying their own safety. A recent independent assessment of the eight leading AI firms found that none had a credible strategy for preventing catastrophic misuse or loss of control. The certifications that do exist rest on the mechanisms just described: Train the system to refuse harmful actions, test it against known scenarios, or monitor individual outputs.

The problem: Refusing to take harmful actions does not help when no individual action is harmful. More testing does not keep pace, because the system generates novel routes faster than testers can think up scenarios to test against. More monitoring of individual outputs does not help when the danger emerges from their accumulation.

This matters for deployment decisions, whether in companies, in governments, or in organizations that hand autonomous AI systems consequential tasks. The level at which safety is currently evaluated and the level at which danger operates are different, and nobody has bridged them.

The safety constraint that exists today governs a single action. It tells a model: Do not do this. The constraint that is needed governs a path. It tells a model: Do not go there. These are not problems for the next generation of AI. They are properties of the systems being deployed right now—and every month, the paths grow longer and the oversight grows thinner.

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Yuk Hui, philosopher: ‘Tech companies want to exploit us and control us every second’. Comment: Have you had all your data stolen; it cannot be described as stolen because it is not theft because you willingly give your data in return for their platform. Imagine years of posting just gone … it is happening more and more to people who failed to understand the deal say 10 years ago

TECHNOLOGY

Yuk Hui, philosopher: ‘Tech companies want to exploit us and control us every second’

The Hong Kong thinker argues that today’s business model may not wipe out humanity, but it can impoverish our lives

Jaime Rubio Hancock

Jaime Rubio Hancock

MAY 24, 2026 – 06:00 CEST

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Hong Kong-born philosopher Yuk Hui was on track to become a computer engineer, but artificial intelligence led him to question consciousness, ethics, and our relationship with technology, ultimately prompting him to study philosophy in London.

In his book Machine and Sovereignty: For a Planetary Thinking, the professor at Erasmus University Rotterdam proposes technodiversity — an openness to traditions beyond the Western — as a response to an increasingly homogeneous world with ever-more-powerful corporations. In Post-Europe, Hui warns against nationalist and exclusionary ideologies, and in Kant Machine, he uses Kant’s ideas to explore the limits of AI.

We spoke with him during a visit to Madrid in late April, where he gave a talk at the Contemporánea Condeduque cultural center alongside journalist Marta Peirano. He doesn’t give his age, but when we ask whether he expected today’s rise of artificial intelligence back when he began studying philosophy, he jokes that he’s not that old: “There was already quite a bit of research on AI and neural networks.”

What has changed most, he says, is the business model behind the technology: “Most of these companies are, first and foremost, financial companies. Only after that are they tech companies.” This model, he argues, is less a threat to our jobs than a force reshaping entire economies and creating new kinds of work — like the rise of delivery‑app labor.

Question. This kind of work is worse for workers.

Answer. Not only that, but your life becomes tied to an algorithm. For example, the estimated delivery time within a three-kilometer [1.9-mile] radius decreases every year. The algorithm scores, manages the route, and penalizes. Many people thought that with these jobs, at least you’d have a flexible schedule. But that’s not true. I think the question of technology and work has less to do with unemployment and more to do with tech companies that want to exploit us and control us every second.

Q. So what can we do? Can we regulate technology?

A. Regulating or deregulating is a false dilemma because it means we’ve already accepted the starting point. We need to find a different path. And that path is technodiversity. We have to think, for example, about what technology could facilitate the work of local communities or about different social networks. I’m not saying that regulation isn’t important, but it’s not enough. We need to develop alternatives and guide innovation in other directions.

Q. In Post-Europe, you speak of a post-European Europe. What does that mean?

A. The term comes from the Czech philosopher Jan Patočka. It refers to the fact that, after the Second World War, Europe ceased to be a world power. But this doesn’t mean that Europe should rearm itself to regain its dominance. That would be preparing us for another catastrophe. We live in a post-European reality. Everyone, including those in Asia, is post-European because we have all been affected by European modernity. If we go to Tokyo or Seoul, we see more European than Asian elements, and we can’t renounce that. We need to think about what to do next, and the answer isn’t to retreat into the nation-state and expel immigrants, but to develop policies capable of addressing local problems that cannot be solved from a global perspective: unemployment, crime, community building…

Q. You also speak of facilitating the individuation of thought.

A. I start from the concept of individuation by the philosopher Gilbert Simondon. We are not finished individuals; we are always in process. For example, one day we read a book, and it transforms our life. Another day, we meet someone who becomes a friend, or we meet someone else and start a family. There are tensions that grow until the structure can no longer bear it and transforms. I wanted to explore this idea further by stating that tensions in thought are precisely the condition for thought to occur.

Q. How have you personally experienced these tensions? You’re from Hong Kong, but you’ve studied European, Chinese, and Japanese philosophy…

A. When I was growing up, Chinese philosophy seemed outdated, like it belonged to the past, to the empire. That puzzled me… I try to rethink the relationship between all these philosophies, and that means I also live in tension, because we all carry different cultural resources. I learned the Chinese classics, I went to study in the U.K., in France, in Germany… and those are my resources. They are within me; perhaps in some ways, they don’t speak to each other, but they coexist. I am their bearer. And, of course, they create tensions. I have to facilitate this individuation, which is my own individuation as a philosopher.

Q. Is this cultural mix a way of moving towards the planetary thinking you propose in Machine and Sovereignty?

A. When we talk about the planetary, we tend to think in terms of ever-larger scales: from the polis to the state, from there to large international spaces like the European Union, and then to the idea of ​​a world government. But I don’t think that’s the solution; that’s just a continuation of modernity, the pretension of dominating everything. Planetary thinking boils down to a very complex question: how can we develop coexistence among humans and also with non-humans? This implies returning to the Earth and thinking about diversity in three areas: biodiversity, noodiversity — from the Greek nous, thought — and technodiversity. These three areas are not separate; they are interconnected. Humans cannot remain on the sidelines of biodiversity; we live in nature and are part of nature.

Q. What do you think about nostalgia in politics?

A. If by the politics of nostalgia we mean living in the glory of the past — for example, the glory of Spanish colonization or the glory of Western dominance — I think it’s a dangerous idea. If we think like that, we will repeat the catastrophes of history. We live in a different situation than in the past, and it’s very dangerous to return to those earlier times: we are now very close to the debates that preceded the Second World War.

Q. Is a Third World War possible?

A. Look at how many countries are preparing for war: if we don’t want it, why are we militarizing ourselves? In this, I’m closer to Kant and his idea of ​​perpetual peace. Another world war would be a catastrophe. We are at a critical moment to think about the future of the planet, and we need to resist these ideologies that are regaining strength.

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DW: Children, teens in Germany lack access to mental health care. Comment: Imagine how we neglect mental illness in Ireland; where is the primary care promised when in the 1980’s patients were encouraged to leave the institutions to experience life in a caring community

https://p.dw.com/p/5Doby

Children, teens in Germany lack access to mental health care

SocietyGermany

Melina Grundmann 05/23/2026May 23, 2026

German doctors are sounding the alarm as the number of children and adolescents experiencing emotional health issues is on the rise — but youths in need face a lack of access to therapy.

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The Rundown AI: Google’s AI cracks nine unsolved maths problems


🧮 Google’s AI cracks nine unsolved math problems
Image source: Images 2.0 / The Rundown
The Rundown: Google DeepMind’s AlphaProof Nexus, an AI system that generates machine-verified mathematical proofs, solved nine open Erdős problems, including two unsolved for 56 years, just a day after OpenAI claimed its own Erdős breakthrough.
The details:
The system paired an LLM with Lean, a proof assistant, to generate machine-verified proofs for the nine problems spanning combinatorics and graph theory. Each problem cost a few hundred dollars to solve, with the AI also proving 44 open conjectures from the Online Encyclopedia of Integer Sequences. A simpler version of the agent matched the results but cost more, and problems requiring new mathematical constructions remained out of reach. OpenAI’s win last week saw its AI disprove an 80-year-old Erdős conjecture — months after walking back a claim of solving 10 novel problems.
Why it matters: Google’s progress on math problems unsolved for decades shows how fast AI is moving toward original solutions, and how formal verification changes the game. The system generates proofs, verifies them in Lean, and repeats until one passes. Over time, this will help researchers make novel discoveries at machine speed
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Axios: New Iran deal timeline

 ⏱️ New Iran deal timeline
 
President Trump rides in the presidential limousine, known as the Beast, after arriving on Marine One at Rockland Community College in Suffern, N.Y., on Friday. Photo: Alex Brandon/AP

The White House thinks it could take several days for an agreement with Iran to be approved by the country’s leadership, including Supreme Leader Mojtaba Khamenei, Axios’ Barak Ravid reports.

Why it matters: The deal would avoid an escalation of the war and decrease pressure on the oil supply. But it’s unclear whether it will lead to a lasting peace agreement that also addresses Trump’s nuclear demands. 

President Trump said on Truth Social that he told his “representatives not to rush into a deal” to end the war.

He said the U.S. naval blockade will “remain in full force and effect until an agreement is reached, certified, and signed.”

A senior U.S. official said Iran’s “slow and opaque” decision-making system could delay an agreement by another few days

.“We are in a very good place — but there are ways in which the deal can be undermined,” the official said.Via Truth Social

👀 Behind the scenes: Trump told leaders of several Arab and other Muslim countries during a Saturday conference call that if a deal to end the Iran war is achieved, he wants their nations to sign peace agreements with Israel, per two U.S. officials with direct knowledge of the call.

The call included the leaders of Saudi Arabia, UAE, Qatar, Pakistan, Turkey, Egypt, Jordan and Bahrain.Share this story.

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Pope urgest humanity to slow down AI

 🕊️ Pope urges humanity to slow down AI
 
Pope Leo XIV attends the presentation of his encyclical today at the Vatican. Photo: Alberto Pizzoli/AFP via Getty Images

Pope Leo XIV, in his first encyclical, urged governments today to slow the development of AI systems, warning they can spread misinformation, prioritize conflict, and risk leading the world down a path of unending war.

“What is needed is a more active political involvement that is capable of slowing things down when everything is accelerating,” Leo writes in the 43,000-word text, “Magnifica humanitas” (Magnificent humanity).

The subtitle: “Encyclical letter on safeguarding the human person in the time of artificial intelligence.”

Why it matters: Leo, the first pope from the U.S., has adopted a more forceful tone in recent months. Today’s manifesto made a range of impassioned appeals to world leaders, Reuters reports.

Encyclicals are one of the highest forms of teaching from the leader of the Catholic Church’s 1.4 billion members.

The pope says the biblical story of the Tower of Babel — where a human tribe, driven by pride, angers God by trying to create a tower tall enough to reach heaven — shows the risk of an enterprise that “aspires to reach heaven without God’s blessing.”

“With the heart of a shepherd and a father, I ask everyone to abandon the construction of yet another Tower of Babel and to join forces in building up the common good,” the pope said.

Read the encyclical … Full story.
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Axios: Unrecognizable 2028 – our future foretold

Unrecognizable 2028 — our future foretold
 
Illustration of a crystal ball
Illustration: Annelise Capossela/Axios
 
🔮 Axios CEO Jim VandeHei pulls the camera way back in this synthesis for his weekly C-Suite newsletter:

Multiple disruptive forces will converge by 2028 — toxic political fragmentation, superintelligent AI and a platform shift bigger than social media — hitting simultaneously, not sequentially: 

Politics: Two wide-open, bitterly contested presidential primaries are nearly certain as both parties reimagine their platforms in real time. Old issues (jobs, inflation, the economy) will fuse with new ones (AI, growing anti-Israel sentiment, drones). 

AI: The models will be exponentially more capable by 2028, and likely to be fully embedded in every job across every industry. It’s difficult to imagine that no defining AI event has occurred — a cancer cure on the upside, a grid attack on the downside.️

Platform shift: Every major information platform of the last 30 years — from cable news to social media — created a new power structure. Winners got rich. Laggards got irrelevant. The shift from web to LLM-based information is potentially bigger than all of them. The next phase: hardware. Devices worn, carried or embedded will route nearly all information through AI interfaces. The smartphone made the web the default. The next devices will make the LLM the default. 

Inequality surge: By 2028, the top 10% will likely drive more than half of all U.S. consumer spending. The rich will get dramatically richer off AI. We may mint the first trillionaires with nation-state wealth in private hands. Imagine the politics of that. 

Debt: Based on government projections, we’re staring at roughly $43 trillion in total gross national debt. Nearly 15% of all tax revenue will service debt — without being invested in anything. Congress won’t act until a crisis hits. 

Wildcards: China, an energy crunch, a new war, a climate shock. Any one of these could rewrite reality.📈 If you’re a CEO or on a CEO’s team: Apply now to join Jim’s new Axios C-Suite weekly newsletter. … Share this story.
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Neuroscience News: The ventral premotor cortex acts as an abstract mental typewriter, storing and recombining discrete action symbols to drive compositional generalization and creative problem-solving. Credit: Neuroscience News. Comment: (post TBI, frontal lobal damage ex contrecoup, aphasia inter alia other outcomes applies. Also defined by the word Broca) – Quote “Mechanistically decoding how symbols are assembled provides a framework to dramatically improve BCIs, allowing devices to translate neural intent into fluent speech or physical action. The paradigm also offers diagnostic pathways for action-planning disorders like constructional apraxia and psychiatric conditions like schizophrenia.”

The ventral premotor cortex acts as an abstract mental typewriter, storing and recombining discrete action symbols to drive compositional generalization and creative problem-solving. Credit: Neuroscience News

Brain Region Discovered for Abstract Thought

Neuroscience

·May 23, 2026

Summary: Researchers discovered the first definitive neural evidence of how the brain creates and reuses abstract symbols to think creatively. The research tracks the neural substrates of “compositional generalization”, the foundational cognitive ability to take familiar components and recombine them into entirely fresh ideas.

By observing brain cell activity in primate models during complex touchscreen tasks, investigators located this symbolic engine within the ventral premotor cortex. This discovery upends traditional views of the motor system, offering a mechanistic look at abstract thought while providing templates to optimize brain-computer interfaces (BCIs) and assess cognitive disorders.

Key Facts

  • The Recombination Engine: Humans naturally possess the capacity to learn discrete symbolic units—like words, shapes, or musical notes—and envision how those symbols can be reused in novel contexts to fuel problem-solving and creative thinking.
  • The Ventral Premotor Mediator: Neuroscientists located the neural substrates of this process inside the ventral premotor cortex, a section of the frontal lobe. The region serves as a crucial mediator, bridging the prefrontal cortex (responsible for high-level planning) and the motor cortex (responsible for executing physical movement).
  • The “Action Symbol” Paradigm: Because human brain-imaging tech lacks the resolution to monitor individual nerve cells, researchers trained macaque monkeys to draw geometric shapes (lines, arcs, squares) on touchscreens, treating each shape as a discrete “action symbol”.
  • Choosing Logic Over Tracing: When presented with complex, completely new shapes, the animals actively chose to strategically recombine their learned symbols to build the images rather than relying on a basic, unthinking tracing strategy. This proved they understood the actions as abstract symbolic building blocks.
  • The Mental Typewriter: The study fundamentally redefines the ventral premotor cortex. Long mischaracterized as a basic motor-planning zone for finger movements, the data proves it acts as an abstract mental typewriter, specifying the symbolic “key” to press before instructing the motor cortex to execute the actual stroke.
  • Upgrading BCIs and Diagnosis: Mechanistically decoding how symbols are assembled provides a framework to dramatically improve BCIs, allowing devices to translate neural intent into fluent speech or physical action. The paradigm also offers diagnostic pathways for action-planning disorders like constructional apraxia and psychiatric conditions like schizophrenia.

Source: Rockefeller University

If you ask a child to draw an animal that doesn’t exist, they’ll often cobble together components from real ones—say, the body of a seal with an elephant’s trunk, four octopus arms, and one lizard eye.

This imaginative ability is theorized to stem from our larger capacity to learn symbolic units—an arm or a leg in the aforementioned example, or perhaps a word—and then envision how those symbols could be reused in a new context. Neuroscientists call this facility for recombining familiar elements into fresh ideas compositional generalization, and it is hypothesized to be key to problem solving, making sense of new situations, and creative thinking.

In new research published in Nature, Rockefeller University’s Laboratory of Neural Systems has found the first evidence of the neural substrates that underlie this process. The team located it in the ventral premotor cortex, a section of the frontal lobe.

The region appears to act as a sort of mediator between the prefrontal cortex, where higher-level thinking such as planning occurs, and the motor cortex, which enables movement.

In their findings, the researchers not only illuminate fundamental properties of neural function but also see implications for improving computer-brain interfaces (BCIs) and studying brain disorders.

“The discovery solves a long-standing problem in cognitive neuroscience: Where do symbols—the basic units of thought—come from?” says Winrich Freiwald, head of the lab. “It also points to a future—a near future—in which we can understand thinking mechanistically.”

Action symbols

Compositional generalization is an influential hypothesis in neuroscience for explaining the wide variety of human abilities that use abstract thought to generate new ideas, including math, written and spoken language, drawing, dancing, handwriting, and musicianship. It may also characterize cognitive abilities we share with other animals, such as reasoning, object manipulation, and tool use.

However, there hasn’t been definitive neuroscientific evidence of symbols. “The idea behind our research was, if these reusable components exist, what would their neural activity look like?” says first author Lucas Tian, a postdoctoral fellow in the lab. “If there are units that are being reused in different situations, then you should be able to see that in the neural data.”

Designing an experiment to locate such neural mechanisms, however, was no mean feat. Only humans do math, use language, or draw, and the methods currently used for measuring brain activity in humans do not have the necessary resolution to monitor the activity of nerve cells in the brain.

To bypass that technical limitation, Tian worked with macaque monkeys. “We wanted to develop an animal model in which we can actually observe compositionality in action in the animals’ behavior while simultaneously doing neural recordings to understand how the brain might be doing this,” Tian describes.

But he still had to confront the problem of finding a behavioral paradigm for the animals that could uncover their compositional abilities. Tian’s idea was to teach them to trace simple geometric figures on touchscreens—lines, squares, arcs, circles, triangles—and then task them with re-creating new shapes, all while observing their brain activity through sensors. Each simple shape was considered its own discrete knowledge unit, or action symbol—action because they had to physically execute the drawing of each one.

Then he built novelty into the experiment by testing how the monkeys drew new, more complex shapes. “I gave them a lot of symbol variation rather than having them repeat one simple task over and over. They had to learn how to grapple with new and changing factors, which is the sort of environment you’d find compositional generalization useful for,” Tian describes.

He found that even though they could have drawn these new images by using a simple tracing strategy—moving their fingers along the edges of the shapes—they instead chose to recombine the symbols they had learned to create new complex combinations. This revealed that they had understood these actions as symbols—building blocks for creating novel drawings.

Surprising activity

Tian used an array of electrodes to observe hundreds of neurons across eight brain regions simultaneously throughout these activities.

“It was important for us to cast a wide net,” he notes, “because no one knew whether—or where —compositional generalization might be occurring in the brain.”

The study found that one particular region activated as the monkeys drew: the ventral premotor cortex, an area of the frontal lobe traditionally associated with the planning and execution of movement—especially hand movements. Tian and his colleagues found that the activity was not simply involved in motor execution but represented a high-level cognitive representation of the action itself.

“What Lucas found forces us to re-think the role of this part of the brain,” Freiwald says. “It is not simply a part of the motor system one step removed from the control of the finger, but an area that generates a sort of mental typewriter. It specifies in an abstract format the ‘key’ to press when you want to express yourself in writing, and then instructs another area to turn that key into a stroke.”

Insights into disorders of the human brain

The researchers believe their novel approach could develop into a foundational experimental paradigm that could be used in humans as well. Drawing is a widely used tool for diagnosing cognitive disorders; specific disorders result in specific drawing impairments.

“One possibility is that the things we learn could lead to new insights into psychiatric disorders such as schizophrenia or action-planning disorders like constructional apraxia, where people have trouble creating complex action sequences even though they understand the task at hand and retain basic motor abilities,” says Tian.

To that end, they plan to collaborate with neurosurgeons and their patients to gather brain activity data from people who have had a procedure involving brain implants, such as for epilepsy.

They also see possibilities for the improvement of BCIs. “Knowing how thinking works mechanistically will improve our ability to read the activity of the human brain and express it into speech or action through brain-machine interfaces, where such expression is not otherwise possible,” Freiwald says.

Moreover, there are essential questions about cognition at play, he adds. “This is basic research on a fundamental quality of human nature—thinking, which is altered in many psychiatric disorders. We conduct this work with the goal of improving the human condition.”

Key Questions Answered:

Q: How does a child drawing a made-up monster explain the deep mechanics of human thought?

A: When a child draws a creature that doesn’t exist, they instinctively grab a seal’s body, an elephant’s trunk, and an octopus’s arms. This ability to take familiar, separate components and recombine them to handle a brand-new situation is called compositional generalization. It is the biological framework behind language, math, art, and everything we define as human creative thinking.

Q: Why does calling the ventral premotor cortex a “mental typewriter” change how we view the brain?

A: For decades, scientists thought this region was just a basic cog in the motor system meant to move your fingers. This study forces a complete rewrite of that theory. The area is actually a high-level cognitive powerhouse that holds abstract symbols. It picks out the conceptual “key” you want to type to express yourself, and then passes that abstract blueprint down to the muscles to create a stroke.

Q: How can knowing where “symbols” live help someone who is paralyzed communicate through a computer?

A: Modern Brain-Computer Interfaces (BCIs) try to read a patient’s brain activity and turn it into speech or machine movement. Up until now, we didn’t know the exact mechanism of how the brain structures abstract units of thought. By revealing how the brain builds and combines these symbolic building blocks in real time, engineers can design BCIs that read intent mechanistically, allowing paralyzed individuals to express themselves with unprecedented speed and fluid accuracy.

Editorial Notes:

  • This article was edited by a Neuroscience News editor.
  • Journal paper reviewed in full.
  • Additional context added by our staff.

About this neuroscience and abstract thought research news

Author: Katherine Fenz
Source: Rockefeller University
Contact: Katherine Fenz – Rockefeller University
Image: The image is credited to Neuroscience News

Original Research: Open access.
Neural representation of action symbols in primate frontal cortex” by Lucas Y. Tian, Kedar Garzón Gupta, Daniel J. Hanuska, Adam G. Rouse, Mark A. G. Eldridge, Marc H. Schieber, Xiao-Jing Wang, Joshua B. Tenenbaum & Winrich A. Freiwald. Nature
DOI:10.1038/s41586-026-10297-x


Abstract

Neural representation of action symbols in primate frontal cortex

A hallmark of intelligence is proficiency in solving new problems, including those that substantially differ from previously seen problems. Problem solving in turn depends on the goal-directed generation of novel ideas and behaviours, which has been proposed to involve internal representations of discrete units (or symbols) that can be recombined into numerous possible composite representations.

Although this view has been influential in cognitive-level explanations of behaviour, definitive evidence for a neuronal substrate of symbols has remained elusive.

Here we identify a neural population that encodes action symbols—recombinable representations of discrete units of motor behaviour—in a specific area of the frontal cortex.

In macaque monkeys performing a drawing-like task, we found behavioural evidence that action elements (strokes) exhibit three crucial features that indicate an underlying symbolic representation: (1) invariance over low-level motor parameters; (2) categorical structure, which reflects discrete action types; and (3) recombination into novel sequences.

Based on simultaneous neural recordings across eight regions of the motor, premotor and prefrontal cortex, we identified population activity specifically in the ventral premotor cortex that encodes planned actions in a manner that also reflects invariance, categorical structure and recombination.

These findings reveal a neural representation of action symbols localized to the ventral premotor cortex and a putative neural substrate for symbolic operations.

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Axios: Dems weaponize Epstein in midterm

 📺 Dems weaponize Epstein in midterm ads
 
Photo illustration: Brendan Lynch/Axios. Photo via Getty ImagesSeveral top Democratic candidates are airing scathing midterm ads linking their Republican foes to the Jeffrey Epstein scandal, Axios’ Holly Otterbein reports.

They’re betting that theTrump administration’s reluctance to release the Epstein files still resonates with voters. 

In the hotly contested Ohio Senate race, Democrat Sherrod Brown has spent nearly $1.5 million on TV ads slamming GOP rival Sen. Jon Husted for taking donations from Epstein financial client Leslie Wexner, per ad-tracking firm AdImpact. (Watch)

Husted spokesperson Amy Natocetells Axios that the campaign has “donated all available funds” from Wexner “to an anti-human trafficking charity.” 

Graham Platner, the presumptive Democratic nominee in the Maine Senate race — a must-win for Dems’ hopes of a Senate majority — is making anti-Epstein messaging part of his strategy to unseat Republican Sen. Susan Collins.

In a six-figure TV ad, Platner accuses Collins of selling out voters to “the president and to the Epstein class.” (Watch)

 Rep. Ro Khanna, a California Democrat who spearheaded the push to release the Epstein files, tells Axios: The establishment class thought I was crazy when I first pushed to release the Epstein files.”

“What they missed is that Epstein goes to the core of what people hate about Washington: a rigged system where the rich and powerful play by different rules.”Go deeper.
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WSJ Events: Former MI6 Chief Richard Moore on the Changing World Order

May 20, 2026Richard Moore, former head of Britain’s foreign intelligence service, discusses geopolitical issues reshaping the international balance of power, including China’s support of Russia, President Trump’s aggression towards Greenland, and Europe’s ability to defend itself. This discussion took place at Journal House Davos during the World Economic Forum in January 2026.

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