A journey through Anil Seth’s revolutionary science of consciousness
We’re All Hallucinating Right Now
I was sitting in a coffee shop when I read this line: “We’re all hallucinating all the time; when we agree about our hallucinations, we call it ‘reality’.”
Wait. What?
Your brain, right now, is hallucinating this page. The words you’re reading, the chair you’re sitting in, the sounds around you—all of it is your brain’s best guess about what’s out there. You’ve been walking around your whole life thinking you’re seeing reality directly. You’re experiencing your brain’s prediction of reality.
“It may seem as though the self—your self—is the ‘thing’ that does the perceiving. But this is how things are. The self is another perception, another controlled hallucination, though of a very special kind.”
You are a hallucination too. The person you think you are—the experiencer, the observer, the one behind your eyes—is also being created, moment by moment, by prediction.
Your Brain is Sealed in Darkness
Imagine you’re a brain. Actually try this. You’re sealed inside a skull. Complete darkness. Total silence. Electrical signals are your only information about the world outside.
These signals come with labels attached. They announce their modality. Your brain has to figure it all out from electrical patterns.
“There’s light, sound, or anything—it’s completely dark and utterly silent.”
So what does your brain do? It makes predictions. Educated guesses. Controlled hallucinations about what’s causing those signals.
“Our perceptual world alive with colours, shapes, and sounds is nothing more and nothing less than our brain’s best guess of the hidden causes of its colourless, shapeless, and soundless sensory inputs.”
Your brain builds a model of reality from the inside out. Then it checks its predictions against incoming sensory data. When there’s a mismatch—a prediction error—it updates the model.
This is happening constantly. Millions of micro-updates per second. Your experience of “now” is actually your brain’s best guess about what’s happening, refined continuously by prediction errors.
The research shows: Studies using predictive processing frameworks reveal that conscious perception emerges from this continuous cycle of prediction and error correction. The brain maintains a hierarchical model, with each level making predictions about the level below.
Perception is Controlled Hallucination
“Understanding controlled hallucinations this way, we now have good reasons to recognize that top-down predictions do merely bias our perception. They are what we perceive.”
Read that again. Your predictions ARE your perception.
The coffee cup on your desk? That’s a prediction. The sound of traffic? Prediction. The feeling of your body in space? Prediction.
Bottom-up signals from your senses do influence these predictions, of course. But perception is primarily a top-down process. Your brain is generating your experiential world from within, using sensory input to keep the hallucination accurate.
“On the controlled hallucination view, the purpose of perception is to guide action and behaviour – to promote the organism’s prospects of survival. We perceive the world as it is, but as it is useful for us.”
You see what you need to see to survive and thrive. What you need to function. Your brain creates the reality that serves you best.
This is why two people can witness the same event and have genuinely different experiences of it. They’re each hallucinating their own version, constrained but determined by what they saw.
You’re a Beast Machine Built to Survive
“The beast machine theory proposes that consciousness in humans and other animals arose in evolution, emerges in each of us during development, and operates from moment to moment in ways intimately connected with our status as living systems.”
You are a beast machine. A biological prediction engine designed by evolution to keep itself alive.
Every perception you have stems from your nature as a self-sustaining living machine that cares about its own persistence. Your conscious experience is intimately tied to the business of staying alive—maintaining your body’s internal states within viable boundaries.
“All of our experiences and perceptions stem from our nature as self-sustaining living machines that care about their own persistence.”
This is why consciousness feels the way it does. Why pain hurts. Why pleasure feels good. Why hunger drives you. Why fear grabs your attention. These experiences exist because they helped your ancestors survive long enough to reproduce.
Your brain is constantly tracking your body’s internal state—your heartbeat, breathing, temperature, glucose levels, everything. Then it’s predicting what needs to happen next to keep you alive. That prediction is what you experience as “being you.”
Neuroscience connection: Research on interoception (internal body sensing) shows that conscious experience is deeply rooted in the brain’s model of the body’s physiological state. This aligns with the “beast machine” framework.
The Self is Just Another Prediction
“The self is an immutable entity that lurks behind the windows of the eyes, looking out into the world and controlling the body as a pilot controls a plane. The experience of being me, or of being you, is a perception itself – or better, a collection of perceptions – a tightly woven bundle of neurally encoded predictions geared towards keeping your body alive.”
There’s someone home. There’s a “you” behind your eyes, pulling the levers, making decisions, experiencing life.
That feeling is also a controlled hallucination.
The self you experience—the continuous, unified “me” that seems to persist through time—is your brain’s prediction about who and what you are. It’s a useful fiction. A story your brain tells to make sense of the constant stream of sensory input and bodily states.
“We live with an exaggerated, extreme form of self-change-blindness, and to understand why, we need to understand the reason we perceive ourselves in the first place. We do perceive ourselves in order to know ourselves, we perceive ourselves in order to control ourselves.”
You perceive yourself so you can control yourself. The self is a control mechanism.
This is why the self feels so stable even though every cell in your body is constantly changing. Your brain maintains a continuous prediction of “you” across time, smoothing over the discontinuities, creating the illusion of a single, stable entity.
Free Will is Both Real and Illusory
“Free will – whatever you think about it, we’re determined to have it.”
Do you have free will? Yes and no. It depends on what you mean.
The spooky, magical kind of free will—where “you” as some non-physical entity reaches into the physical world and makes things happen? That’s an illusion.
“From another perspective, free will is illusory at all. So long as we have relatively undamaged brains and relatively normal upbringings, each of us has a very real capacity to execute and to inhibit voluntary action, thanks to our brain’s ability to control our many degrees of freedom.”
But you do have a real capacity for voluntary action. Your brain can inhibit impulses. It can plan. It can deliberate. It can choose between options based on your values and goals.
This is freedom from immediate causes in the world or in your body. Freedom from coercion by others. It’s freedom from the laws of nature or from the causal fabric of the universe. But it’s enough. It’s the kind of freedom that actually matters for living your life.
“The usefulness of feeling ‘I could have done otherwise’ is that, next time, you might.”
The feeling that you could have chosen differently? That’s useful. It helps you learn. It helps you adjust your behavior. It helps you navigate similar situations better in the future.
The physical world duplicates itself from day to day, even from millisecond to millisecond. Your brain changes with every experience. So next time, in a similar-but-different situation, you genuinely might choose differently.
Consciousness is Wider Than Human
“Human consciousness is just a tiny region in a vast space of possible consciousnesses.”
You think consciousness is rare. Special. Uniquely human, or maybe shared with a few mammals.
What if there are infinite varieties of conscious experience, most of which you’ve tasted?
“For a conscious creature, there is something that it is like to be that creature. There is something it is like to be me, something it is like to be you, and probably something it is like to be a sheep, or a dolphin.”
A bat experiences reality through echolocation. An octopus experiences reality with a distributed nervous system across eight arms. A dog experiences reality through scent in ways you can barely imagine.
Each creature that’s conscious has its own unique flavor of experience. Its own way of hallucinating reality based on its biology, its needs, its evolutionary history.
There is almost certainly nothing it is like to be a bacterium, a blade of grass, or a toy robot. For these things, there is (presumably) any subjective experience going on: inner universe, awareness, or consciousness.”
But somewhere between bacteria and humans, consciousness emerged. And it probably exists in forms and varieties we can scarcely imagine.
Research context: Studies on animal consciousness are revealing complex cognitive and emotional lives in creatures previously assumed to be mere automatons—from cephalopods to corvids to elephants.
Reality is Flexible
Your reality is fixed. It’s the way things are. Objective. Unchangeable.
But your reality is a prediction. And predictions can change.
This is why meditation works. Why psychedelics are so powerful. Why trauma can reshape your entire world. Why falling in love changes everything. Why depression makes even beautiful days feel gray.
Your brain is updating its predictions based on new information. When those predictions shift dramatically, your entire experience of reality shifts with them.
Studies on psychedelics and altered states show that substances like psilocybin create “decomposed predictions”—extra-detailed priors that can either enhance sensory experience or dissolve it completely into hallucination, depending on the precision of sensory input.
This is also why your past looks different in hindsight. Why memories feel so vivid even though they’re reconstructions. Why ten people can witness the same event and tell ten different stories.
Each brain is generating its own controlled hallucination, constrained by sensory input but determined by what it predicts.
Being You is Being Your Predictions
“I predict myself, therefore I am.”
This is the update to Descartes. “I think, therefore I am.”
Thought is what makes you conscious. Prediction is what makes you conscious. Your brain’s constant, ongoing project of predicting what’s happening—outside you and inside you—is what creates the experience of being you.
“Instead of that being the case, if we ask what might be the most fundamental kind of experience, it might be something much more common among other animals, maybe the experience of pain, of suffering, of hunger, of thirst, something very deeply embodied rather than something abstract like thought.”
The most basic form of consciousness is deeply embodied. The feeling of pain. Hunger. Thirst. These are predictions about your body’s state and what it needs.
Higher-level consciousness—thinking, reflecting, imagining—builds on top of this foundation. But it all starts with a body that needs to stay alive and a brain that’s predicting how to make that happen.
Truths to Carry With You
We’re all hallucinating reality together.
Your brain is sealed in darkness, making educated guesses.
Perception is prediction confirmed by sensory input.
You are a beast machine built to survive.
The self is a useful fiction, a control mechanism.
Free will is real enough to matter.
Consciousness exists in infinite varieties across species.
Your reality is flexible, prediction-based, constantly updating.
Pain and pleasure exist because they helped ancestors survive.
Thought is what makes you conscious.
The “you” behind your eyes is also a prediction.
Your memories are reconstructions, predictions about the past.
Different brains create genuinely different realities.
The purpose of perception is guiding action, seeing truth.
Every experience stems from your body’s need to persist.
Consciousness emerged somewhere between bacteria and humans.
Psychedelics alter consciousness by changing prediction precision.
Your past looks different in hindsight because predictions shift.
Understanding consciousness requires understanding prediction.
Being you is being your brain’s best guess about being you.
The Real Problem of Consciousness
“The ‘hard problem’ of consciousness—why we have subjective experience at all—is a fascinating philosophical puzzle. But the ‘real problem’ is explaining, predicting, and controlling the phenomenal properties of consciousness.”
We spend so much time asking: Why does consciousness exist? How does matter give rise to experience?
These are important questions. But they might be the wrong questions to start with.
The real problem—the one we can actually make progress on—is understanding how consciousness works. How different brain states correspond to different experiences. How perception happens. How the self arises. How attention works. How emotions feel the way they do.
Solve enough of these real problems, and the hard problem might dissolve. Like the mystery of life dissolved once we understood biology deeply enough.
Your brain is already doing all of this. Generating experience. Creating the self. Building reality from prediction. You’re already a walking, talking solution to the problem of consciousness.
Now we’re finally starting to understand how.
Resources for Going Deeper
Anil Seth’s Work:
- Being You: A New Science of Consciousness (2021)
- TED Talk: “Your brain hallucinates your conscious reality” (11+ million views)
- Sackler Centre for Consciousness Science at University of Sussex
- Website: anilseth.com
Predictive Processing Research:
- Hohwy, J., & Seth, A. (2020). “Predictive processing as a systematic basis for identifying the neural correlates of consciousness.” Philosophy and the Mind Sciences
- Clark, A. (2015). Surfing Uncertainty: Prediction, Action, and the Embodied Mind
- Friston, K. (2010). “The free-energy principle: a unified brain theory?” Nature Reviews Neuroscience
Related Consciousness Research:
- Tononi, G. – Integrated Information Theory
- Dehaene, S. – Global Workspace Theory
- Barrett, L. F. – Theory of Constructed Emotion (predictive processing applied to emotion)
Neuroscience of Consciousness:
- Meta-analyses on predictive processing neural networks
- Studies on interoception and bodily awareness
- Research on altered states (psychedelics, meditation, dreaming)
“As often in science, from Copernicus ‘we’re at the centre of the universe’ to Darwin ‘we’re related to all other creatures’ to the present day, with a greater sense of understanding comes a greater sense of wonder, and a greater realization that we are part of and apart from the rest of nature.”
Your brain is hallucinating you into existence right now. Moment by moment. Prediction by prediction.
Welcome to being you.
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