The PROOF We’re In A Simulation Is Hiding In Plain Sight (Part 3)
Tom Bilyeu opens the third installment of his simulation trilogy with a confession dressed as a thesis: you have no free will, none, and that is the best news he has ever delivered. He builds the case in four moves. First, free will dies in biology, with Phineas Gage, Robert Sapolsky's Determined, and a 2008 Berlin fMRI study that read decisions out of the brain up to ten seconds before the subject felt them.
Published Jun 2, 202632:07 video27 min readAdded Jun 14, 2026Open on YouTube →
At a glance
Tom Bilyeu opens the third installment of his simulation trilogy with a confession dressed as a thesis: you have no free will, none, and that is the best news he has ever delivered. He builds the case in four moves. First, free will dies in biology, with Phineas Gage, Robert Sapolsky's Determined, and a 2008 Berlin fMRI study that read decisions out of the brain up to ten seconds before the subject felt them. Second, the silver bullet that is supposed to save free will, quantum randomness, gets turned into evidence for the opposite: superposition is the universe running occlusion culling, a video game trick for computational efficiency, not a hiding place for choice. Third, he closes the last exits, the three body problem and Stephen Wolfram's computational irreducibility prove a system can be fully determined and fully unpredictable at once, and "I can change" and "I deliberate" both reduce to computation. Fourth, he reframes the whole thing as liberation: if you are an NPC in a 13.8 billion year sandbox, you are not being judged, you are being witnessed, and the way to win the game is to play as if you do have free will.
This is a manifesto, not a balanced survey. Below is the entire argument rebuilt in Bilyeu's own order, with every experiment, every name, every number, and every analogy he uses, so a reader gets the full ride without watching.
The cold open: the brain decides before you do
Bilyeu starts with a single experiment and lets it set the temperature for everything that follows. In 2008, a team of neuroscientists in Berlin put people in an fMRI machine and gave them the simplest possible task: press a button, left hand or right hand, whenever they wanted, whichever they wanted. The researchers watched the brain. And the readout was damning for free will. From the brain signals alone, they could predict which button a person would press up to ten seconds before that person became consciously aware that the decision had been made.
Ten seconds. Sit with that. The conscious mind, the part you think of as the chooser, was the last to know. The unconscious machinery was already ten seconds down the road. The conscious self showed up at the finish line, stapled a post hoc rationalization onto an action it had nothing to do with, and then took credit for it. The experiment has since been reproduced with similar findings. Bilyeu's framing is blunt: if we are all NPCs living inside a simulation, this is exactly the result you would predict.
He concedes up front that this is a triggering idea. For a lot of people it invalidates their entire worldview and drops them into a nihilistic spiral. His promise is the reverse: he will show that you have no free will whatsoever, and that this life is more meaningful, not less. He will work through every major objection, including the one many treat as the kill shot, quantum randomness. His prediction is that by the end you will agree we have no free will and we live in a simulation, and you will feel better about life. If not, the comments are open.
Part 1: it's biology all the way down
The historical anchor is Phineas Gage. On September 13th, 1848, Gage, a railroad foreman, was tamping explosive powder into a bore hole with a 13 pound iron rod. A spark lit the charge and the rod shot up through his cheek, through his frontal lobe, and out the top of his skull. He survived. But the man who walked away was not the man who arrived. Gage went from responsible and disciplined to impulsive, profane, unreliable, unable to hold a job. His friends said he was "no longer Gage." Why? Because his brain was damaged. Bilyeu's point is precise: that is exactly the outcome you expect if we live in a deterministic universe that is computational in nature, and only if we do.
The literature is not short of cases. Bilyeu stacks them up to make the chain of biological cause and effect undeniable:
Tumors that rewrite character. Patients whose brain tumors turned them into sexual deviants, only to revert to normal once the tumor was removed.
Split brain patients who give different answers to the same question depending on which hemisphere you ask.
Toxoplasmosis, the brain parasite famously carried by cats, which makes infected hosts more aggressive and more risk taking.
Adjust the right chemical or physical structure in a brain and you get a fundamentally different person. The list, he says, goes on and on.
This is the body of evidence that drove the Stanford neuroscientist and MacArthur "genius grant" recipient Robert Sapolsky, one of the most cited behavioral biologists alive, to write Determined, which Bilyeu calls the seminal work on free will. Seven hundred pages, thousands of citations, one conclusion: free will is an illusion.
The regress that has no exit
Sapolsky's argument, as Bilyeu relays it, is a chain you cannot break anywhere. Every decision you make is determined by the brain state right before it. That brain state was set by the hormones and neurochemicals running through you an hour earlier. Those hormones were shaped by last night's sleep. Last night's sleep was shaped by yesterday's stress. Yesterday's stress was shaped by an email from your boss. That email was shaped by your boss's entire career, upbringing, genes, culture, his parents' culture, and a hundred generations of selective pressure reaching back to the African savannah.
It's biology all the way down. There is no point in that chain where a free, uncaused "you" reaches in and changes the outcome. There is no pause button that lets your soul cast a vote. Give someone enough LSD and they will go on a trip, and nothing but time gets them out of it. Free will cannot step in and make you less high. Sapolsky's summary, quoted directly: we are nothing more or less than the cumulative biological and environmental luck over which we had no control. The next decision will feel like yours, but it is the output of a hundred thousand inputs you did not author and cannot control.
Figure 1. Sapolsky's regress, the spine of Part 1. Each link is fully caused by the one beneath it, all the way down to deep evolutionary time. Bilyeu's claim is geometric: there is nowhere in this stack for a free chooser to insert itself.
Telling someone to transcend their biology is incoherent. Imagine telling a profoundly autistic person to simply use their free will and act normal. Absurd on its face, yet that is what you must believe is possible to believe in free will at all. Biology is not a constraint on you. Biology is you. The thing you call "you" is just the way your particular brain turns inputs into outputs. That is why, when something alters the brain, people who know you say you are no longer the same person. Change the substrate on which thought runs and the thoughts change, because there is no homunculus, no little man hiding in your head driving the body. You are the body. That is precisely why there is no free will.
Where could free will even hide?
The standard rebuttal is that the Gage and tumor cases are too dramatic, that a normal person facing normal options can freely choose. Bilyeu points back to the opening fMRI study, where the brain decided seconds before the subject was aware. The universe is deterministic, a world bound by physical rules connected in a never ending string of cause and effect. So where would free will hide? How could it sit outside that sequence? It couldn't. He grants the intuition, he feels in control of his decisions too, then names it: belief in free will is the last holdout of a superstitious species that prefers magic to mapping cause and effect.
The universe is math, provably so
Here Bilyeu pivots from biology to the foundation under it. The universe is mathematics, and he argues it provably so by a pattern: every time mathematicians invented something they thought was pure abstraction, physicists later found it describing reality.
Newton and Leibniz discovered calculus simultaneously, he argues, precisely because calculus was already there, part of the universe's operating code.
Riemann's strange curved geometry sat on a shelf for 60 years until Einstein found it perfectly described gravity.
Italian mathematicians thought they had invented fake numbers as a bookkeeping trick. Three hundred years later physicists proved those imaginary numbers are core to writing quantum mechanics.
This pattern is what the Nobel laureate Eugene Wigner named the unreasonable effectiveness of mathematics: math has no obligation to describe physical reality, yet it does every single time, with unreasonable accuracy. The simplest explanation, Bilyeu says, is that math describes the universe because the universe is math. The cosmos is not a thing being described by equations. The cosmos is what appears when you run the equations. Physics is what the universe is doing; mathematics is how the universe knows what to do.
Your brain is a product of that framework. It is running a program, literally a bundle of algorithms making predictions about the world. Signals get read, decisions get made, just not freely. Decision making is constrained by biology, which is constrained by physics, which is constrained by the mathematical instruction set that sets it all in motion. Free will never enters, even though you are programmed to feel that it does. And none of this means you cannot change, you can and will, but change too is part of the endless sequence of cause and effect.
Elliot: when you remove emotion, choice disappears
Bilyeu calls this the brutal experiment that proves the brain runs an adaptation and goal acquisition program. If your decisions sat outside cause and effect, emotions would not control them. But they do. The neuroscientist Antonio Damasio had a patient named Elliot, a successful businessman, father, and husband. In the early 1980s, a tumor was found in his ventromedial prefrontal cortex, the vmPFC, the region that integrates emotion into reasoning. Surgeons removed the tumor and the damaged tissue around it.
After surgery, the numbers said he was intact. His IQ stayed in the 97th percentile. His memory was fine. His logical reasoning was fine. He could analyze moral dilemmas with sophistication and solve complex problems on paper. But in actual life he could no longer decide. Picking a restaurant for lunch was impossible. Choosing which color pen to fill out a form with was a problem he could not solve. His marriage collapsed. Every business he started failed. His whole life fell apart. The lesson: biology, specifically emotion, drives every decision. Calling the stochastically deterministic output of that biological system "free will" makes the word "free" incoherent. He flags that he will unpack the "stochastic" part in the quantum section, but for now: this is a deterministic universe.
Part 2: quantum mechanics buries free will (the silver bullet, reversed)
Many viewers, he anticipates, will cry foul that he is ignoring quantum mechanics. So he meets it head on. In 2022, three physicists won the Nobel Prize in Physics for experimentally proving quantum mechanics is real and that the universe is not locally real. Einstein could not wrap his head around it and called it spooky action at a distance. It turns out to be true. The short version: at the quantum level, particles do not have definite properties until something measures them. The universe holds particles in superposition, a set of possible values, each with a probability, none of them definite until something forces the calculation to run and a concrete answer to appear. Said simply, three guys won the Nobel Prize for proving the moon only exists when someone looks at it. Yes, he says, literally correct.
The universe, in his telling, works exactly like a video game. If the system does not need to render something, it does not. Reality is not a static thing out there waiting to be discovered, it is a possible thing that takes definite shape only when something interacts with it.
The free will trap, and why it snaps shut
Here is the move people make: aha, free will lives in the quantum realm, where determinism does not exist, where it is all random probabilities. If the base layer is not deterministic, maybe my decisions are not determined either, maybe in the quantum noise there is room for a real choice. People find solace there. Bilyeu says quantum mechanics proves the exact opposite. Its purpose is not to leave the door open for free will. Its purpose is to make the simulation computationally efficient.
Quantum mechanics is not the universe being mysterious. It is the universe doing what every game engine does to avoid melting your computer while rendering far too many polygons. Game hardware is limited, so developers use clever tricks to fool you into thinking you see a whole world; it is all smoke and mirrors. The only things that actually exist are the things something is interacting with. Everything else is just a probability. In games this is called occlusion culling, and every modern game engine does it. It is how you fake an entire world in real time without cooking the GPU.
Fine, the objector retreats, the universe runs like a game for efficiency, but that does not rule out free will. Unfortunately, Bilyeu says, it rules it out and padlocks the door. His hypothesis: the probability wave exists for efficiency, and when a specific variable is needed, the wave function collapses into a definite value. It is all math. The probability has to become specific when it is time to run the computation that needs that variable. It is not about free will, it is a system that has the formula but needs the final variable to finish a deterministic process. And because this happens at the level of particles, you do not get to see the menu of values and pick the one you want. It happens automatically: the wave collapses to a single value, then the simulation renders or the NPC acts.
Stochastic determinism, stated cleanly
This is the term to keep. Stochastic determinism. There is an element of randomness, but the randomness is resolved procedurally by the system. No conscious agent is required, and it happens at a layer and a speed a conscious agent could never access. When a quantum event fires in your neurons and the wave function collapses to a value, that value did not come from you. It came from the same universal RNG, a random number generator, an idea borrowed from video games, running since the Big Bang. We are all downstream of that roll of the dice. We are not the roller.
The structure, he says, is very clean. Where the system is deterministic, you do not choose, because cause and effect runs the show. Where the system is probabilistic, you do not choose, because the dice run the show. And the dice are not you; the dice are part of the same system your brain runs inside. The reason a value stays a probability set rather than something specific, the reason randomness is even tolerated, is efficiency: if it is way out there and nothing is interacting with it, the system just says it will be something like this, and only when specificity is needed does it run the calculation. It is the only way to stay efficient.
Figure 2. Bilyeu's stochastic determinism. Both exits, the deterministic one and the random one, bypass the chooser entirely. Cause and effect or the dice resolve the value, and it feeds straight into the next deterministic step. Quantum randomness does not rescue free will; it just adds a second way to not be the one deciding.
Part 3: the last hiding places of free will
With biology and quantum mechanics handled, Bilyeu hunts down the remaining shelters.
The three body problem and computational irreducibility
Take three rocks. Throw them into space, close enough that their gravity tugs on each other. Now write a formula that tells you exactly where all three will be in a thousand years. You cannot. Not because the math is missing, Newton handed it to us in 1687 and every physicist understands it. The problem is that two rocks pulling on each other is easy, but add a third and the computation breaks down. There is no closed form solution. This is the three body problem.
The physicist and mathematician Stephen Wolfram gave our inability to leap ahead to the answer a name: computational irreducibility. For most complex systems there is no formula that skips to the result. The only way to know what the system does is to run every step. Even an infinitely powerful computer cannot fast forward, it must compute the whole thing moment by moment, exactly like reality. The only way to find where the three rocks end up is to simulate every instant between now and then, year by year. The universe offers no shortcuts.
That, Bilyeu says, is another nail in the coffin, because it proves a system can be completely determined and completely unpredictable at the same time. Exactly like life. The rocks obey physical law with perfect obedience. Nothing about their path is free, nothing chosen, every position dictated by gravity, momentum, and the positions before. The system is 100% deterministic, even if stochastically so, and also impossible to predict. You just sit back and watch it unfold. This is what fools our intuition into believing we have choice: we cannot be predicted. The future feels open, full of choices not yet made, and we take that openness as proof of freedom. But the three body problem shows unpredictability and freedom are not the same thing. The fact that no one can predict your next move, including you, does not mean you are choosing it. It means you are complex enough that the only way to find out what you will do is to watch you do it.
"But I can change"
Other than the quantum argument, this is the one people feel most profoundly: people change, and they change because of their choices. The addict who gets clean. The hot tempered person who learns control. Getting stronger. Deciding not to eat bad food. It feels like conscious choice. Bilyeu honors how sacred the feeling of agency is, and insists his position is not nihilism but its opposite. The change is real, you did change. But look at what actually happened: an input came into your system and altered it. You hit a bottom that rewired your priorities. You met a person who showed you a different way. You read a book, you had a kid, you got scared, you got inspired, you grew up and your brain reorganized itself. That is what we are designed to do. The brain runs an algorithm for adaptation, one of its most powerful programs: new inputs come in, the system updates, the outputs change. And not just within a life, but across generations, we literally evolve. That is growth, and it does not need a magical plane outside biology or physics to be incredibly cool. The program is doing what the program was built to do. You may not have authored the change, but you are the change.
"But I deliberate"
The next defense: I do not just react, I sit and weigh options for hours, days, months, even years, and that agonizing careful weighing has to be free will. It isn't, and Elliot already showed why. Deliberation is not a free agent weighing pure logic. Deliberation is computation that takes a while. It is the brain running a longer calculation, pulling in more variables, waiting for an input that triggers an emotional response strong enough to force the system to return a value, left or right, yes or no, marry or divorce. Taking a long time does not make it free, it makes it slow. A computer grinding a hard problem is not exercising free will, it is just working through more steps, or hitting a decision gate that needs high emotional amplitude to respond. This is why so many people fail to change until they hit rock bottom. Rock bottom is a euphemism for sufficient emotional intensity to prompt a specific response. Either physics does not matter at all and physics is the illusion, or the persistent feeling that we sit outside our biology is the illusion.
"I can just feel it"
The last fallback, the one almost everyone retreats to: there is nothing you can say to change my mind, I can feel the free will, physics is the illusion, everything about my life tells me I am making choices. Bilyeu's reply is to weigh the two worldviews. Hold the "I feel it" view and you must exist entirely on a magical plane, divorcing yourself from everything you can see, touch, and feel. Adopt the stochastically deterministic frame, where emotions are a necessary part of the processing, and you only have to get over one thing: it feels like I have free will even when I don't.
That feeling is the single most convincing illusion our biology produces, but it is still a product of biology. Plenty of things feel true and aren't. It feels like the sun goes around the earth, but it doesn't. It feels like the ground is solid, but it is almost entirely empty space. It feels like the table is one continuous object, but it is a humming cloud of particles held together by forces you cannot see. Your feelings about reality are not measurements of reality. They are renderings, generated by a computational system whose job is to turn inputs into outputs based entirely on mathematics. Whatever a soul is, whatever consciousness is, it arises as a mathematical phenomenon inside a computational system. Maybe the soul is from God. Maybe consciousness is broadcast in from outside. Maybe everything is consciousness itself. Sure, no problem, he says, but the substrate it moves through and acts upon is pure stochastically determined mathematics. Nothing sits outside that. The feeling of free will creates a sense of immersion, but it is provably an illusion. Even if we are all touched by God, He chose to create us inside a deterministic universe.
Figure 3. Bilyeu's argument from illusion. He files free will alongside three feelings everyone now agrees are wrong. The point is rhetorical but pointed: a sensation of truth has a poor track record as evidence of truth.
Part 4: why being an NPC is the best news you'll ever get
Now the payoff, and the reason he insists this is not nihilism. As far as we can see in every direction, the cosmos is dead and silent. As he argued in the first video of the trilogy, that silence is exactly what a resource efficient simulation would look like: it does not render the empty parts. His hypothesis is that the whole thing, all 13.8 billion years, the trillions of dark galaxies, the oceans of vacuum, is a sandbox built to run an evolution simulator, so whoever is running it forward can see what emerges. That is why almost all of it stays switched off. The universe is the computational context the simulation needs; anything that does not need precise measurement stays a probability cloud. The only thing that collapses into a definite state is what the simulation needs to render. And right now, on this tiny blue dot, one of the things it spends the energy to render is you.
When you realize your entire life is a simulation, you realize that the fullness, the richness, the loves, the losses, the triumphs, the tragedies, all of it is precisely what it feels like to be an NPC in a simulation. And it is incredible. Discovering that the substrate God works with is mathematics should not distress you in the least. Think about love. We have known for decades exactly what it is: oxytocin, dopamine, and pair bonding circuitry that evolved to keep our ancestors' children alive long enough to reproduce. Just chemicals in context. Knowing how it works, knowing it is not magic, does not make it feel any less magical. No one in love cares how it works; they just know it works and it is awesome. Free will is the same. Sure, we are all NPCs running code we did not write, but the sunset is still staggering, sex is still incredible, holding your child still feels profound.
This sandbox has run for 13.8 billion years. Hydrogen formed into stars, stars into elements, elements into chemistry, chemistry into life, and the whole time it was reaching for something that could do exactly what you are doing right now. It wanted to see what you would do, what you would become. He grants the obvious caveat: the simulation hypothesis is probably an incomplete metaphor, every model is. But sharpening the metaphor is how we unlock what comes next. By freeing ourselves from the mystical metaphors we have historically been bound by, we prime ourselves for new insights and a new era of results. And if this is what it feels like to be a bunch of lines of code in a video game, he is here for it. It can be hard and terrifying at times, but the juice is worth the squeeze.
The closing turn is the one to remember. He knows he did not choose to say that sentence, and you will not choose how you react, but we are all changed by the ideas we encounter. Despite being stochastically determined, no one knows what tomorrow holds, and that is why this is the ride of a lifetime. The crucial reframe: we are not being judged by whatever is running the simulation. We are being witnessed. And the great irony, the more you realize you have no free will, the less weight the past carries, the freer you are from the burdens that crush people, and honestly the more hope the future holds. His final instruction collapses the whole paradox into a single livable rule: even if you have no free will, even if we are NPCs inside a video game, the way to win this game is to play like you do have free will.
Key takeaways
The cold open is the thesis in miniature. The 2008 Berlin fMRI study read button presses out of the brain up to ten seconds before conscious awareness. Consciousness is the last to know, then takes credit.
Biology is not a constraint on you, it is you. Phineas Gage, character changing tumors, split brain patients, and toxoplasmosis all show that altering the brain alters the person, because there is no separate self behind it.
Sapolsky's regress has no exit. Decision, brain state, hormones, sleep, stress, an email, a hundred generations on the savannah. Nowhere does an uncaused chooser reach in.
Emotion is the engine of choice. Damasio's patient Elliot kept his IQ and logic but lost all ability to decide once his vmPFC was damaged. Pure logic without emotion cannot pick a pen.
Quantum randomness is occlusion culling, not a loophole. Superposition keeps the simulation efficient; collapse resolves a value procedurally via a universal RNG. That is stochastic determinism, and the dice are not you.
The three body problem proves determined and unpredictable can coexist. Computational irreducibility (Wolfram) means no shortcut to the answer. Unpredictability is not freedom.
"I changed" and "I deliberated" both reduce to computation. Change is the adaptation algorithm running on new inputs; deliberation is just a slow calculation waiting for enough emotional amplitude.
The reframe is liberation, not nihilism. You are not being judged, you are being witnessed. Drop the weight of the past, and play like you have free will to win the game.
Chapters
Timestamps are clickable. Click one and the player jumps there and keeps playing while you read.
0:00 Intro
1:38 Part 1: It's Biology All The Way Down
14:22 Part 2: Quantum Mechanics Bury the Notion of Free Will
19:53 Part 3: The Last Hiding Places of Free Will
27:51 Part 4: Why Being An NPC Is The Best News You'll Ever Get
Notable quotes
The researchers could predict which button each person was going to press up to 10 seconds before the person became consciously aware of the fact that a decision had already been made.
Tom Bilyeu, 0:20
It's biology all the way down. There is no point in that chain where a free uncaused you reaches into the system and somehow changes the outcome.
Tom Bilyeu, 4:15
The cosmos isn't a thing being described by equations. The cosmos is what appears when you run the equations.
Tom Bilyeu, 9:30
Three guys won the Nobel Prize for proving that the moon only exists when someone looks at it. Yes, that is literally correct.
Tom Bilyeu, 15:25
Where the system is deterministic, you don't choose because cause and effect runs the show. Where the system is probabilistic, you don't choose because the dice run the show. And the dice aren't you.
Tom Bilyeu, 18:30
It proves that a system can be completely determined and completely unpredictable at the same time. Exactly like life.
Tom Bilyeu, 21:30
Your feelings about reality are not measurements of reality. They are renderings generated by a computational system whose job is to turn inputs into outputs based entirely on mathematics.
Tom Bilyeu, 26:40
We're not being judged by whatever is running the simulation. We're being witnessed.
Tom Bilyeu, 31:50
Even if we are NPCs inside of a video game, the way to win this game is to play like you do have free will.
Tom Bilyeu, 32:20
The 2008 Berlin fMRI free will study, in the lineage of John-Dylan Haynes and the earlier Benjamin Libet experiments on readiness potential preceding conscious decision.
Phineas Gage, the 1848 frontal lobe injury that changed a man's character.
Bilyeu's whole case is that determinism and meaning are not enemies. If you accept that the brain is a program, that biology is you, that quantum randomness is a rendering trick and not an escape hatch, and that even your changes and deliberations are computation, you do not lose the sunset, the love, or the child in your arms. You lose the weight of the past and the burden of authorship you never actually carried. You are not a defendant in this simulation, you are a witness to it. And the practical instruction survives the metaphysics intact: play like you have free will, because that is how an NPC wins the game.
Full transcript
In 2008, a team of neuroscientists in Berlin put people in an fMRI machine and asked them to press a button, left hand or right hand, whatever they wanted. The researchers then watched their brains. And what they saw demonstrated that free will is an illusion. Based on brain signals, the researchers could predict which button each person was going to press up to 10 seconds before the person became consciously aware of the fact that a decision had already been made. 10 seconds. The people weren't actually consciously choosing. Their conscious mind was the last to know. The unconscious processes were way ahead and the conscious mind just stepped in at the end, layered on a post hoc rationalization for the action and then took credit for something it actually had nothing to do with. The experiment has been reproduced with similar findings. And to be honest, if I'm right and we're all NPCs living inside of a simulation, this is exactly what you'd expect.
For a lot of people, that is a triggering idea that invalidates their entire world view and leaves them in a nihilistic spiral. But what I'm going to show you in this video is that while you have no free will whatsoever, this life is even more meaningful than you think. I know the primary objections, and I'm going to go through them all, including what many think is the silver bullet that destroys my entire argument, quantum randomness. And by the time you finish part four, I predict you'll not only agree that we have no free will and we live in a simulation, but you're going to feel better about life. But if you don't, be sure to let me know in the comments.
Welcome to part one. It's biology all the way down. On September 13th, 1848, a railroad foreman known as Phineas Gage was packing explosive powder into a bore hole with a 13 pound iron rod. A spark ignited the charge and the rod shot up through his cheek, passed through his frontal lobe, and exited the top of his skull. The injury took Gage from responsible and disciplined to impulsive, profane, unreliable, and unable to hold a job. His friend said he was no longer Gage simply because his brain was damaged. But that's what you'd expect, but only if we live in a deterministic universe that is computational in nature. If you don't yet believe that, make sure you watch this video right here.
The scientific literature is clear on the point of biological cause and effect. There are myriad studies documenting how changes in the brain change the very decisions we make. If you adjust the right chemical or physical structure in someone's brain, they become a fundamentally different person. There are countless stories of things like patients with tumors that turn them into sexual deviants only for them to return to normal once the tumor was removed. Or split brain patients who will give you different answers to the same question depending on which hemisphere of their brain you speak to. Or people who become more aggressive and risk-taking after being infected with the brain parasite toxoplasmosis which is found in cats by the way. The list goes on and on.
And these are the kind of phenomena that convinced the Stanford neuroscientist and MacArthur Genius Grant recipient Robert Sapolsky to write the book Determined, the seminal work on free will. Sapolsky is one of the most cited behavioral biologists ever. And in Determined, he offers up 700 pages and thousands of citations, convincingly making a single point. Free will is an illusion. Every decision you make is determined by the brain state that came just before it. That brain state was caused by the hormones and neurochemicals running through you an hour earlier. Those hormones were shaped by the sleep you got last night. The sleep you got last night was shaped by the stress you felt yesterday. The stress you felt yesterday was shaped by an email you got from your boss. The email your boss sent was shaped by his entire career, his upbringing, his genes, his culture, and the culture of his parents and his parents' parents and a hundred generations of selective pressures stretching back to the African savannah. It's biology all the way down.
There is no point in that chain where a free uncaused you reaches into the system and somehow changes the outcome. The laws of physics are always in control. There's no pause button that lets your soul make a decision or cast a vote. Give someone enough LSD and they are going to go on a trip and nothing but time is going to get them out of it. Free will can't step in and make you less high. And the same is true of every moment in your life. You're beholden to your biology, to your chemistry. As Sapolsky says, we are nothing more or less than the cumulative biological and environmental luck over which we had no control. Every input that goes into every decision is bound by your biology. The next decision you make will feel like it's yours, but it will inevitably be the output of a 100,000 inputs that you didn't author and can't control. There's no way to transcend your biology. The very notion doesn't even make sense. Imagine telling someone who is profoundly autistic to simply use their free will and act normal. It's an absurd idea on its face, but it's what you'd have to believe is possible in order to think that you have free will.
Biology isn't a constraint on you. It is you. The very thing you think of as you is simply the way your unique brain turns inputs into outputs. That's why when something alters someone's brain, people that know them end up saying that's no longer the same person. When you change the substrate on which thought itself happens, the thoughts change. They become something else specifically because there is no you that exists. You're not some little man hiding in your brain driving your body. You are your body. And that is precisely why there is no free will.
Now, I know people will say that these are overly dramatic examples and that when a normal person is presented with options, they will be able to freely choose between them, even if they're limited in some way by their biology. That's where I'll point you back to the fMRI experiment we opened with, the one where the researchers could see the brain decide seconds before the person was consciously aware that the decision had already been made somewhere deep inside their biology. And of course it had. The universe is deterministic. We live in a world defined by and bound by physical rules that connect through a never ending string of cause and effect. Where would free will hide? How could it sit outside of that sequence of cause and effect? It couldn't. And while I share the strong intuition that I am in control of my decisions, the reality is that the belief in free will is the last holdout of a superstitious species that tries to make sense of the world through magic rather than by mapping cause and effect.
But the truth is the universe is mathematics, provably so. That's why every time mathematicians have invented something they thought was pure abstraction, physicists have later discovered that that mathematics isn't abstract at all. It actively describes some element of how the universe works. Newton and Leibniz discovered calculus simultaneously precisely because calculus was already there as a part of the fabric of the universe's operating code. Riemann's bizarre curved geometry sat on a shelf for 60 years until Einstein discovered it perfectly described gravity. Italian mathematicians thought they had invented fake numbers they needed as a bookkeeping trick. But it turns out that 300 years later, physicists would prove imaginary numbers, as they're known, are the core to describing quantum mechanics mathematically. Eugene Wigner, the Nobel laureate, called this pervasive truth the unreasonable effectiveness of mathematics. His point was that math has no obligation to describe physical reality. And yet it does every single time with unreasonable accuracy. The simplest explanation is that math describes the universe because the universe is math. The cosmos isn't a thing being described by equations. The cosmos is what appears when you run the equations. Physics is what the universe is doing. Mathematics is how the universe knows exactly what to do.
Your brain is a product of that structural framework. Your brain is running a program. Literally, your brain is a bundle of algorithms trying to make predictions about the world around you. The signals are being read. The decisions are being made, just not freely. The entire decision-making process is entirely constrained by your biology, which is entirely constrained by physics, which is entirely constrained by the mathematical instruction set that puts it all in motion. Free will never enters into the picture, despite the fact that you're programmed to feel like it does. And none of that means you can't change. You can and will. You know that. We've all experienced it. But it's all part of the endless sequence of cause and effect.
The programs our brains are designed to run include an algorithm for goal acquisition and adaptation. There's a brutal experiment that proves that that's true. If your decision sat outside of pure cause and effect, your emotions wouldn't control your decision-making. Your free will would. But unfortunately due to a cruel twist of fate, we know that people's decisions are completely controlled by their emotions, not their logical brain and not the magical idea of free will. If you selectively damage the area of the brain responsible for emotions, for instance, the person will suddenly be unable to make a decision. The neuroscientist Antonio Damasio had a patient named Elliot, a successful businessman, father, and husband. In the early 1980s, a tumor was discovered in his ventromedial prefrontal cortex known as the vmPFC, the part of the brain that integrates emotion into reasoning. The tumor and the surrounding damaged tissue were surgically removed, and post surgery, his IQ remained in the 97th percentile. His memory was still intact. His logical reasoning was still intact. He could discuss moral dilemmas with sophisticated analysis. And he could still solve complex problems on paper. But he lost the ability to make decisions in his actual life. Picking a restaurant for lunch was impossible. Choosing which color pen to use to fill out a form was a problem he simply could not solve. His marriage collapsed. Every business he started failed. His entire life just fell apart.
Biology drives all of our decisions. And to call the stochastically deterministic output of your biological system free will is to make the definition of free completely incoherent. I'm going to talk about the stochastic part of that when we get to the quantum section, but just know for now, this is a deterministic universe. Now, I know many of you are going to cry foul at the idea of the universe and your brain being deterministic. Many people are going to say that I'm ignoring quantum mechanics.
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Welcome to part two. Quantum mechanics bury the notion of free will. In 2022, three physicists won the Nobel Prize for experimentally proving that quantum mechanics are real. The universe is not locally real. Einstein could not wrap his head around this. He called it spooky action at a distance. But it turns out to be true. Now, I covered that finding and the science behind it in this video here. So, check it out if you want the full version, but the short version is that at the quantum level, particles do not have definite properties until something measures them. The universe literally holds particles in a state of superposition. It's not a hypothesis. This is what's been proven. That superposition is a set of possible values, each with its own probability, but none of them definite until something forces the calculation to run and the concrete answer to be produced. Said super simply, three guys won the Nobel Prize for proving that the moon only exists when someone looks at it. Yes, that is literally correct.
The universe works exactly like a video game. If the system doesn't need to render something, it doesn't. The universe is not a static thing out there waiting to be discovered. It's a possible thing that only takes definitive shape when something needs to interact with it. Now, how is that relevant to free will? A lot of people hear about quantum mechanics and they think, "Aha, I knew it. Free will lives in the quantum realm where determinism doesn't exist. It's all random probabilities." If the universe isn't deterministic at the base layer, the argument goes, then maybe my decisions aren't determined either. Maybe somewhere in the quantum noise, there's room for an actual choice. And that is where free will hides. A lot of people find solace in that argument. But quantum mechanics actually prove the exact opposite.
The purpose of quantum mechanics is not to leave the door open for free will. It's there to make the simulation we all live in computationally efficient. Quantum mechanics is not the universe being mysterious. Quantum mechanics is a universe doing what every game engine does to avoid melting your computer while trying to render far too many polygons. When you're playing a video game, the hardware is super limited. So developers have to find clever ways to trick you into thinking you see a real world in front of you. But in fact, just like the real universe, it is all smoke and mirrors. The only thing that actually exists in our universe are the things something is interacting with. Everything else is just a probability. In a video game, that's called occlusion culling. Every modern game engine does it. It's how you build a system that has to create the illusion of an entire world in real time without cooking your GPU.
Okay, you might be thinking, fine, the universe functions like a video game. But just because it works like that for computational efficiency doesn't mean it doesn't also open the door for free will. Unfortunately, it does. It closes the door and padlocks it. My hypothesis is that the probability wave exists to ensure the universe is computationally efficient. But when a specific variable is needed, the wave function collapses into a definitive variable. It's all math. And the probability has to become specific when the time comes to run the computation that requires that variable. It's not about free will. It's about a system that has the math formula but needs the final variable to complete the deterministic process. And since this is happening at the level of particles, it's not like you see the variable set and choose the one you want. The process happens automatically and the probability wave collapses to a single variable and then the simulation just renders or the NPC chooses so on and so forth.
It's known as stochastic determinism. There is an element of randomness but the randomness is resolved procedurally by the system. It doesn't require a conscious agent to make a decision. In fact, it happens at a layer and a speed that a conscious agent could never access or process. When a quantum event happens in your neurons and the wave function collapses to a particular value, the value didn't come from you. It came from the same universal RNG, which is a random number generator. It's an idea from video games that's been running since the Big Bang. We're all downstream of that roll of the dice. We're not the roller. It's just the universe doing what the universe does. It's holding a probability set and then collapsing it to a specific value and then feeding that value into the next deterministic step.
The actual structure of stochastic determinism is very clean. Where the system is deterministic, you don't choose because cause and effect runs the show. Where the system is probabilistic, you don't choose because the dice run the show. And the dice aren't you. The dice are part of the same system the brain is running inside of. And the reason that it remains in a probability set instead of something specific and thus requiring the randomness is for the computational efficiency. If it's way out there and we're not interacting with it, then we're just going to say it's going to be something like this. And only when we need the specificity do we actually go and run the calculations. It's the only way to stay efficient.
So, welcome to part three, the last hiding places of free will. Take three rocks. Throw them into outer space. Keep them close enough that their gravity pulls on each other. Now, write down a formula that tells you exactly where all three rocks will be in a thousand years. You can't. Not because we lack the math. We don't. Newton discovered that in 1687, and today, every physicist on Earth understands it. The problem is that while two rocks pulling on each other is easy enough to compute, when you add a third rock, the whole computation breaks down. There is no closed form solution. This is known as the three body problem. And the physicist and mathematician Stephen Wolfram gave our inability to instantly compute the final answer a name, computational irreducibility. For most complex systems, there is no formula that lets you jump ahead to the answer. The only way to know what the system does is to actually run every step. Even an infinitely powerful computer can't skip ahead. It has to compute the whole thing moment by moment exactly like reality works. Therefore, the only way to find out where our three rocks are going to end up is to simulate every single moment between now and then, step by step, year by year. The universe does not offer us any shortcuts.
And this is the truth that puts another nail in the coffin of free will. How? Because it proves that a system can be completely determined and completely unpredictable at the same time. Exactly like life. When looking at the three body problem and computational irreducibility, you'll realize that those rocks are following physical law with perfect obedience. Nothing about their path is free. Nothing about it is chosen. Every position is dictated by gravity and momentum and the positions that came before. The system is 100% deterministic, even if stochastically so. And it is also impossible to predict ahead of time. You just have to sit back and watch as things unfold. And that's one of the things that fools our intuition into thinking we must have choice. We can't be predicted. Your future feels open, undetermined, full of choices that you haven't made yet. And you take that feeling of openness as proof that you are free. But the three body problem demonstrates that unpredictability and freedom are not the same thing. The fact that nobody can predict what you'll do next, including you, does not mean you're choosing it. It means you're a complex enough system that the only way to find out what you'll do is to watch you do it.
That's the gateway to the remaining defenses of free will, and I'm going to address them. Now, other than the quantum argument, the next one is probably the one that people feel most profoundly. People can change and they change because of their choices. An addict who gets clean, someone with a temper who learns to control it, getting stronger, deciding not to eat bad food. People cannot help but have the feeling that all of those were conscious choices. I know how sacred that feeling of agency is, but stick with me until the end because my position is not nihilism. It's the exact opposite. I think you're going to feel better about all of this once you realize how it actually operates. Because the reality is you did change. The change is real. But when you look at what actually happened, you'll realize that you changed because some input came into your system and altered it. You hit a bottom that rewired your priorities. You met a person who showed you a different way to look at life. You read a book and you had a kid. You got scared. You got inspired. You grew up and your brain just reorganized itself. That is what we're designed to do. Your brain runs an algorithm for adaptation. It's one of the most powerful programs our brain has. You take in new inputs and the system updates and the outputs change. Not only within us, but from generation to generation, we literally evolve. That's what growth is. It doesn't need to happen on a magical plane outside of our biology or outside of physics for it to be incredibly cool. It is the program doing what the program is built to do. You may not have authored the change, but you are the change.
Now, the next defense of free will goes something like this. But Tom, I deliberate. I don't just react. I sit. I weigh the options for hours, sometimes days, months, or even years. That agonizing careful weighing has to be free will. But it isn't. And we already proved why. Remember Elliot, the man who lost the ability to make decisions when his brain stopped integrating emotion? Deliberation isn't some free agent weighing pure logic. Deliberation is computation that takes a while. It's your brain running a longer calculation, pulling in more variables, waiting for an input that triggers a sufficient enough emotional response to force the system to return a value for all the probabilistic stuff, left or right, yes or no, up or down, marry or divorce. The fact that it took a long time doesn't make it free. It just makes it slow. A computer running a hard problem isn't exercising free will. It's just working through more steps or contending with a decision gate that requires a high emotional amplitude to get a response. This is why so many people fail to change until they hit rock bottom. Rock bottom is a euphemism for sufficient emotional intensity to prompt a specific response. I know how much people initially hate that reasoning, but either physics doesn't matter at all and physics is the illusion or the persistent feeling that we sit outside of our biology is the illusion.
And that brings us to the next common defense of free will. This is the one that almost everybody falls back on in the end. They're going to say, "There's nothing you can tell me that will change my mind. I can feel the free will. Physics is the illusion. Everything about my life tells me I'm making choices." As I constantly remind myself, the emotions themselves make dots feel like they connect that don't actually connect. If you try to hold that world view, you end up existing entirely on a magical plane, having to divorce yourself from everything you can see, touch, feel around you. Whereas if you adopt the frame that this is a stochastically deterministic universe and emotions are a necessary part of the processing, you only have to get over one thing, which is that it feels like I have free will, even when I don't.
The feeling that we have free will is the single most convincing illusion that our biology produces, but it's still a product of our biology. There are a lot of things that feel true, but aren't. It feels like the sun goes around the earth, but it doesn't. It feels like the ground is solid. But the truth is, it's almost entirely empty space. It feels like the table in front of you is one continuous object instead of a humming cloud of particles held together by forces you can't see, but that's what it is. Your feelings about reality are not measurements of reality. They are renderings generated by a computational system whose job is to turn inputs into outputs based entirely on mathematics. Whatever a soul is, whatever consciousness is, it arises as a mathematical phenomenon inside of a computational system. Some people will say that a soul is from God. And they'll be perfectly comfortable living on that magical plane. Others will say consciousness is broadcast from the outside. Others still will say that everything is consciousness itself. Sure, no problem. But for whatever reason, the substrate that it moves through and acts upon is pure stochastically determined mathematics. Nothing sits outside of that. The feeling of free will creates a sense of immersion, but is still provably an illusion. Even if we are all touched by God, he's chosen to create us inside of a deterministic universe.
So, what does this all mean? Welcome to part 4. Why being an NPC is the best news you'll ever get. As far as we can see in every direction, the cosmos is dead and silent. And as I argued in my first video in this trilogy, that silence is exactly what a resource efficient simulation would have to look like. It doesn't render the empty parts. Given that, my hypothesis is that this whole thing, all 13.8 billion years, trillions of dark galaxies, oceans of vacuum, it's all a sandbox built to run an evolution simulator. So whoever is running it forward can see what emerges. That's why almost all of it stays switched off. The universe is simply the computational context that the simulation needs to run. And anything that doesn't need to be precisely measured just remains as a probability cloud. The only thing that collapses into a definitive state is what the simulation needs to render. And right now on this tiny blue dot, one of the things it spends the energy to render is you.
When you realize that your entire life is a simulation, you realize that the fullness, the richness, the loves, the losses, the triumphs, the tragedies, all of it is precisely what it feels like to be an NPC in a simulation. And it is incredible. Discovering that the substrate God, whatever God is, chooses to work with is mathematics, shouldn't be distressing in the least. Think about love. We've known for decades exactly what it is. Oxytocin, dopamine, and pair bonding circuitry that evolved to keep our ancestors' children alive long enough to reproduce. Just chemicals in context. Knowing how it works, knowing that it isn't magic, still doesn't make it feel any less magical. No one in love cares how it works. They just know it works and it's awesome. Free will is the same. Sure, we're all NPCs running code that we didn't write, but the sunset is still staggering. Sex is still incredible. Holding your child still feels profound.
This sandbox simulation has run for 13.8 billion years. Hydrogen has formed into stars, stars into elements, elements into chemistry, chemistry into life, and the entire time was reaching for something that could do exactly what you're doing right now. It wanted to see what you would do, what you would become. The simulation hypothesis is probably an incomplete metaphor. Every model is. But sharpening the metaphor is how we unlock what comes next. By freeing ourselves from the mystical metaphors we have historically been bound by, we prime ourselves for new insights that will drive a new era of results. And if this is what it feels like to be a bunch of lines of code in a video game, I'm here for it. It can be hard and terrifying at times, but the juice is worth the squeeze.
Now look, I know I didn't choose to say that sentence and I know you won't choose how you react. But I also know we are all changed by the ideas that we encounter. And despite the fact that we are stochastically determined, no one knows what tomorrow holds. And that's why this is the ride of a lifetime. And the cool thing is we're not being judged by whatever is running the simulation. We're being witnessed. And here's the great irony. The more you realize that you don't have free will, the less weight the past has, the more free you are from the burdens that weigh some people down to the point of being crushed by them. And honestly, the more hope the future holds. Even if you don't have free will, even if we are NPCs inside of a video game, the way to win this game is to play like you do have free will.
All right, if you want to see me explore ideas like this in real time, be sure to hit that subscribe button and join me Monday, Wednesday, and Friday at 7 a.m. Pacific time. I hope to see you there. Till next time, my friends, be legendary. Take care. Peace. If you like this conversation, check out this episode to learn more.