How to Be a Better Human - What makes you… you? (w/ Anil Seth)
Episode Date: June 30, 2025What is the aspect of being you that you cling to most tightly? Why are you you and not somebody else? How do you understand and make sense of your experiences? These are questions studied by Anil Set...h, Professor of Cognitive and Computational Neuroscience and the University of Sussex. Anil and Chris reflect on the limitations in describing the brain as a “supercomputer,” the ethical and morally grey areas of technological advancements and brain computer interfaces, and how hallucinogenic drugs affect consciousness.FollowHost: Chris Duffy (Instagram: @chrisiduffy | chrisduffycomedy.com)Guest: Anil Seth (Instagram: @profanilseth | LinkedIn: @anilseth | Website: https://www.anilseth.com/) LinksBeing You: A New Science of ConsciousnessSubscribe to TED Instagram: @tedYouTube: @TEDTikTok: @tedtoksLinkedIn: @ted-conferencesWebsite: ted.comPodcasts: ted.com/podcastsFor the full text transcript, visit go.ted.com/BHTranscriptsWant to help shape TED’s shows going forward? Fill out our survey here!Learn more about TED Next at ted.com/futureyouFor the Idea Search application, go to ted.com/ideasearch Hosted on Acast. See acast.com/privacy for more information.
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You're listening to How to be a Better Human.
I am your host, Chris Duffy.
But actually, how do I know that I'm your host, Chris Duffy?
How do I know that I am Chris Duffy?
Am I sure about that? How do I know that I am Chris Duffy? Am I sure about that?
How do I know that I am me?
How do you know that you are you?
Are we actually conscious beings?
Are we just figments of someone's imagination
or just bits in a simulation?
Today on the show,
our guest is cognitive and computational neuroscientist,
Anil Seth.
Anil is the author of Being You,
a New Science of consciousness.
And he and I are gonna get into some weird
and wild territory, the kind of topics
that you might discuss at 3 a.m. in a dorm room,
or after having eaten a very powerful edible.
But we're gonna be talking about this using real science
and trying to understand genuine advances
in technology and research that are happening right now.
Here's a clip from Enel's TED Talk.
(*Applause*)
So just over a year ago,
for the third time in my life, I ceased to exist.
I was having a small operation.
My brain was filling with anesthetic.
I remember a sense of detachment and falling apart,
coldness.
And then I was back, drowsy and disoriented,
but definitely there.
Now, when you wake from a deep sleep,
you might feel confused about the time or anxious about oversleeping,
but there's always a basic sense of time having passed,
of a continuity between then and now.
And coming around from anesthesia is very different.
I could have been under for five minutes, five hours, five years,
or even 50 years.
I simply wasn't there as total oblivion.
Anesthesia, it's a modern kind of magic.
It turns people into objects,
and then we hope back again into people.
And in this process is one of the greatest remaining mysteries
in science and philosophy.
How does consciousness happen?
Somehow, within each of our brains,
the combined activity of many billions of neurons,
each one a tiny biological machine,
is generating a conscious experience.
And not just any conscious experience,
your conscious experience right here and right now.
How does this happen?
Well, answering this question is so important,
because consciousness for each of us is all there is.
Without it, there's
no world, there's no self, there's nothing at all.
Well, we are very lucky today on the show because here to share a bit of his conscious
experience with us is Anil Seth.
Hi, I'm Anil Seth. I'm a professor of neuroscience at the University of Sussex and the author
of the book Being You, a New Science of Consciousness.
The first question that I have for you is,
for a regular person, just going about their day to day,
why is it important to think about consciousness?
Why does it matter?
It's really easy to take it for granted, isn't it?
I mean, we just are who we are and the world is how it is
and we get on with our daily lives.
But I think if you just reflect on it for a little bit,
and I should think children are very good at this
because I remember first getting interested
in consciousness as a child.
I think as many of us are like,
why am I me and not somebody else?
Questions like that, what happens when I die?
But this moment of reflection
suggests, I think makes it clear that everything that matters to us matters through the medium of
conscious experience. You know, we feel good, we feel bad, we see something beautiful, we see
something ugly. Without experiencing the world and the self, nothing really matters at all.
So I think it's a central concept.
It's a central aspect of what it means to be a living human being.
There are plenty of other reasons why it's important, plenty of other practical applications
in it.
It's not just the realm of philosophy.
It matters in our daily lives.
So I think that's fundamentally why we should be interested in it.
One of the many things that I admire about your work is how you take really big complex ideas
and you don't oversimplify them, but you do make them accessible. And so as we are going to have
this conversation that I think is going to touch on a lot of
big complex ideas about consciousness and conscious experience, let's actually get
started with what I found in your book and in just thinking about these ideas to be one
of the easiest, most concrete immediate examples, which is to think about color.
We have a conscious experience of say the color red or the color green.
And we all think that we understand what that is.
And yet it's possible, in fact, it's quite likely that other people's perception of those exact same colors is not the exact same as ours.
That their experience of the world, their conscious experience is not the same as ours.
Well, I think it's not only likely, it just is the case.
As that example, I think. do you remember it, Chris?
I don't know if people listening to this will, but about 10 years ago, there was this photo
of a dress that half the world saw as yellow and white, and the other half saw as blue
and black.
And that's a very clear example of how you can have the same exact stimulus, the same
image, but we can have a same exact stimulus, the same image,
but we can have a very different subjective experience.
I think color is an excellent example
that gets us into this whole issue of consciousness
and why it's important, because as you said,
we take it for granted.
We walk around the world and things are red
or things are green, the sky is blue,
and it feels to us as if,
but it exists out there in the world independently of us.
But we know that's not true.
And this is even before neuroscience gets going really.
From physics, we know that the electromagnetic spectrum
goes all the way from radio waves, which are very long,
to X-rays, gamma rays, which are really short.
And this so-called visible spectrum is somewhere in the middle.
It's a thin slice of reality.
And what's more, within that thin slice of reality, we just have cells that are sensitive to more or less three different wavelengths.
We call them red, green and blue, but they're not actually coloured.
They're just three wavelengths of electromagnetic radiation. And out of those
three wavelengths, the brain conjures up millions of different colours. So its colour just is
not there, out there in the world in the way that it seems. But it's also not made up. What's happening, as far as people who study this stuff
in detail think, is that surfaces reflect light.
And what we experience as color is a sort of property
of how different surfaces reflect light in different ways.
And that's why color is useful for us
because it helps
us keep track of objects when lighting conditions change and when things change. It's a very
useful thing for our visual systems to be able to do. But it's not this direct transduction
of something that exists in objective reality. It requires a brain and a world to experience
color.
One of the other reasons why I think color
is such an interesting place to start
is because my personal experience here is I am colorblind.
And so I struggle to differentiate between colors,
certain colors that many other people feel
are very clearly different.
So to me, my experience of the world
does not include this bright
line between say, lavender and light blue. Certain types of green and brown are more
on a spectrum to me, rather than like there's a there's a clear difference between them.
And one of the things that happens whenever people find out that I'm colorblind is we
play this game. It's like unavoidable and it doesn't bother me. I know it bothers some
other colorblind people, but we end up playing this game where they point at all the things around us
and they say, and what colour is that? And what colour is that? And what colour is that? And what
does this look like? And they're amazed that it's not always the same for me as it is for them.
The most common form of colour blindness, and see if this resonates with you, is when
and see if this resonates with you, is when what non-colorblind people would say is red
and then say is green,
people with the most common form of colorblindness
would perceive those things as being roughly the same.
Yes, it's a red-green colorblindness.
Every once in a while,
there'll be these photos that kind of go viral,
which is like how the world looks
to someone with red-green colorblindness.
And it'll be two photos that I'm told to someone who does not have this look very different. And to me,
those photos look exactly the same. I could not tell you which one is the altered one.
The photos of Thomas Nagel years ago, 50 years ago, actually wrote this wonderful essay called,
What is it like to be a bat? Now I'm not saying being colorblind is like being a bat. No, but his point was that for each of us,
we have our subjective world and that is unique to us. Everybody's world will be different.
The subjective world of a bat is going to be very different because they have echolocation
and all this other stuff. And the subjective world of someone with colorblinds, of you
Chris, is going to be different with respect to color. It's not a simple subtraction
of what my experience would be.
In being you, a new science of consciousness,
you describe one idea of seeing the world
as controlled hallucination.
So can you define that and talk to us about that?
Because I feel like it really ties in
with what we're talking about.
But the idea of controlled hallucination
is not just an account of how we experience color.
I mean, the power of the idea, at least for me,
and as I try to explain in the book,
it's a way of understanding everything that we experience,
whether it's an emotion or a sense of free will
or the sense of being Chris or being Anil.
It's a way of understanding everything
that we experience whatsoever.
The idea is pretty simple and it's pretty old.
I mean, in thinking about color,
it's already clear that what we experience
isn't this direct readout of what's objectively
out there in the world,
because colors aren't objectively out there in the world.
But now let's switch perspective a little bit and think about what things are like from
the perspective of a brain.
So imagine being a brain.
A brain is locked inside this bony vault of a skull and to a first approximation, what
it's trying to do is figure out what the hell is going on out there in the world or in here in the body.
All the brain has to go on are these electrical sensory signals that arrive via the eyes and
the ears and so on.
Light doesn't just get right into the brain.
It's dark in the brain and it's silent.
All the brain has are electrical signals that are only indirectly related to the things
out there in the world.
They don't have labels.
So the brain has to infer, has to make a best guess about what is happening in
the world based on these ambiguous, unlabeled, uncolored, unsounded sensory
signals.
The brain makes this best guess about what's happening in the world by continually
making predictions about the sensory signals that it's getting and then instead of just reading out
the sensory signals to sort of form this inner picture of the world, the brain is continually
updating the predictions so they explain away the sensory signals that are
coming in.
And the key idea here is that what we experience in this story is the content of these inside-out
predictions.
We don't read out the world from the outside in.
We always actively construct it, actively generate it from the inside out.
Now it turns out, if you do all the maths and all this stuff, that if you have a brain
which is continually updating its top-down inside out predictions to minimize the sensory
signals that are coming in, to try and explain them, predict them before they happen. That mathematically is a very, very good way for the brain to approximate exactly what
caused the sensory signals out there in the world.
It's a very good way to make a best guess.
And that's the claim.
That's what we experience.
And that's why I call it a controlled hallucination, which is a term I like all good analogies. I like the idea because it emphasizes
that our experiences come largely from within.
So that's the hallucination part.
One thing that I think is a way for me
to understand this inside out and outside in dance
is when I think about emotions.
So there's the idea, right,
let's just say with the line between fear and excitement,
I see something exciting and my heart starts pounding
and my heart is pounding because I am excited.
And then there's also the idea that I see something
and my heart starts pounding and then my brain has to decide are your is your heart pounding because you are terrified or because you are excited
and that increasingly the the science seems to be pointing towards the second rather than the first.
That's right there's a theory of emotion from William James who like many theories in psychology
came up with these ideas back in the 19th century.
It was James and another guy called Carl Langer who first put things this way.
They gave the example of seeing a bear.
You see a grizzly bear or something.
You feel very afraid and adrenaline starts coursing through your body and so you run
away.
In this way of thinking about it, you see the bear that causes an emotion of fear
and the emotion of fear sets in train all these bodily responses that allow you to run
away or fight if you really want to fight a grizzly bear, which is a bad idea.
And James kind of flipped that.
What James suggested was going on was that what we experience as the emotion of fear is mostly the
brain's perception of the body's response to the bear. So the chain of causation is now subtly but
importantly different. We see a bear, brain registers there's a bear because that's its
best controlled hallucination of
what's out there in the world.
That itself is still an inference.
That visual perception of the bear immediately sets in train all these physiological changes
in the body, cortisol, adrenaline, all of that.
And then it's the brain's perception of these changes in the
context of a bear being present that is the emotion of fear. And this is a useful way
to think about it because the interior of the body, the state of the body, even on the
body on the inside, the brain has to infer that too. One of the aha moments for me was to think of this James theory of emotion as actually
basically identical to these ideas about how visual perception works.
So just as the brain has to infer the causes of its visual signals and that's what we see,
it's making predictions about what's out there, the exact same mechanism can do what James was suggesting happens. It can make its best
guess about what's happening in the inside of the body and that becomes experiences of
emotion and that's kind of satisfying from a sort of, if you're a theory person, it's
very satisfying because you've got one simple principle, the brain making and updating predictions, that can now bring together what were previously
two quite different fields of understanding human experience. You know, visual perception
on the one hand and emotion on the other. I find very appealing when you have these
unifying principles and you can start to understand different domains of human experience
through the same underlying mechanism.
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So I think that many people,
especially in the Western world,
have this idea of the brain as a supercomputer,
like a very hyper-intelligent machine
that is processing information.
And that image of the brain is often as like,
it is its own thing,
quite separate from the rest of the body.
But it seems to me, like you are saying,
that it is quite a bit more of the full body experience
than just the locked away supercomputer in the top type situation.
I think this idea of the brain as a computer has been an extremely powerful metaphor, but
it's reaching its limits.
The brain is pretty implacable in its complexity and I think scientists have always struggled
to figure out how can we conceptualize
what's happening in this grey goo inside our heads. And initially it was a system of
pipes and plumbing and then a telephone network. And since the 1950s, this metaphor of a computer
has been very powerful. So powerful that we just sort of take it for granted that the
brain computes and processes information and if you programmed
a real silicon computer in the right way, you'd get everything that you get from real
brains including, and we'll come back to this, consciousness. This is where I start to get
really uncomfortable about this metaphor. But the computer, it relies on something to implement the computations, but it's not nearly as intimately
related to the body as our brains are related to our physical bodies.
And I think that's super important if we're ever to really understand how brains work
and what they're for.
The body isn't just this kind of meat-based robot that can take our brain computer
from one meeting to the next.
If you zoom backwards in evolutionary time, every brain that ever existed evolved to control
and regulate and guide the body.
That's what brains are fundamentally for.
I'm inclined to think that we've reached the limits of the brain as computer metaphor.
And the brain is actually much richer, much more complex than computers.
There's one key difference that I'll just mention and then I'd love to see what you
think of it, which is a key principle of all the computers we have is that we have the sharp separation
between software and hardware.
I can run the same version of whatever it is, Word on my computer will do the same thing
on yours.
And on my computer, I can run many different programs and it'll do the same thing every
time if it's working properly.
Even a single neuron is a very complicated biological machine that is trying to keep
itself going, right down into the furnaces of metabolism. And when you see brains like
that and understand their richness and see how different they are from computers, then
it really undermines the idea that what they're doing is computation, because
computation makes sense when you've got this sharp separation.
And to the extent you don't have that, then it makes much less sense to think of the brain
as a computer.
Yeah.
I think that the connection between our body and our brain in the sense of like, you know,
if you exercise, if you lift heavy weights
or go for a run, it changes how you feel in your brain.
It doesn't just change your body.
In a way that I think, if I get a new mouse,
I don't perceive that as changing how my computer feels.
You're right that there is this tight interaction
between our bodies, our brains and our minds.
I mean, our brains are part of our bodies.
I think this is also something we often neglect,
but the brain is an organ, just as much as our heart,
our liver, our kidneys are organs.
But it's a distinctive one.
It's probably, if you're going to have an organ transplant,
the brain is the one operation for which you want to be
the donor and not the recipient.
So you ask a question in your book on page 209 towards the end that I want to ask you
and I think is a really important question for anyone who is listening to this or watching
this to ask themselves as well.
What is the aspect of being you that you cling to most tightly?
So it's your question, but I would like to put it to you
first, what is the aspect of being you that you cling to
most tightly?
Well, of course I clearly remember what I wrote on page 209,
but I think the aspect of self that I cling to most tightly
is this sense of free will.
I mean, one of the other, I think, ways in which our intuition
can mislead us when we think about consciousness
is the idea that the self is just one thing,
that there is a single essence of Christoffy,
there isn't a single essence of Anil Seth.
But that's not the case.
And there are many ways in neurology, psychiatry,
but also in the lab where we can show
that the experience
of being a self has all these different aspects, which are all present in a kind of unified
way for most of us most of the time, but which can come apart. So for instance, emotion,
we already talked about is one part of the experience of self.
It feels like those are on the verge of crossing from the interesting academic questions
into a really practical, applicable question
in a way that is quite frankly to me scary.
So I'll give you just my example
that I'm curious what you think about is,
for me the aspect of being me that I cling to most tightly
is I think some version of uniqueness
that like I am me and there isn't another me out there.
And yet if it was possible to upload my consciousness
or to have an artificial intelligence that was trained
on my voice and my writing and my thinking so much so
that it was the same as me, but not me,
that feels quite disturbing to me.
And yet it doesn't feel impossible to imagine a world
where we get to that place.
So I'm curious to hear your take on that.
I think you're absolutely right
that these are the times we live in
and that's both scary, but also quite exciting
and certainly very interesting place to be
as someone who's followed these things,
of course, both in popular culture as we all do, but just watching what's happening and certainly very interesting place to be as someone who's followed these things, of
course, both in popular cultures, as we all do, but just watching what's happening in
the underlying science too. And it's happening in many ways. So there's the example about
these avatars is really, is really fascinating. And I've had a couple of opportunities to
have a digital avatar. I haven't yet taken them up because I'm slightly worried about,
they're very ethical things about that
that I'm concerned about.
But the fact is it's now possible.
I think it would be still distinguishable from me,
but things will just get better and better for sure.
The other example where I think we're on the cusp
of something that's going to be ethically
and morally very challenging is with brain-computer interfaces.
When you say brain-computer interface, you mean something that literally is going directly
between a brain and a computer.
Like, signals from the brain are directly controlling a robotic limb or they're going
straight into a computer or vice versa.
A signal from a computer is going straight into a brain.
And here's a situation where on the one hand, you've got all these amazing
clinical benefits that you just can't argue against and you really shouldn't
argue against because they're brilliant.
You can help people with Parkinson's disease.
You can restore paralysis to people.
You can restore sight to people, you can restore sight
to blind people potentially, I mean that's coming.
All these amazing interventions that are on the horizon or even here now in some cases.
But then you get to this other terrain of cognitive enhancement.
Can someone who's not got paralysis or blindness or Parkinson's disease. Should we all have
brain computer interfaces just as we all have cell phones these days? Well, that's a very,
very different world. And it's a world where if you take it to an extreme, something like
free will, which is, at least for me, pretty central and part of uniqueness too. I feel
that the thoughts are my thoughts. I feel that the thoughts are my thoughts.
I feel that my actions are my actions.
But if now there's a brain-computer interface that is not merely reading out my intentions
to get something done, but actually causing me to have intentions and thoughts that I
feel are my own,
but I would not have otherwise thought,
that's pretty scary to me.
Because once you've got into the brain,
there's nowhere else to go.
What should we be doing as regular people
to protect our consciousness or to think about it
in a way where we won't just wake up in
a world that's not the world we want to live in. What can we do or how can we understand
this in a different level?
Yeah, it's a very difficult question to answer. I think the good side of the optimistic view
is that there's still time to shape the future in these things. We're not already at the stage of fixing problems
that have already come to exist as we are, for instance,
in how do we rein in the societally problematic
consequences of social media.
We can still decide what kinds of technologies we want
and what kinds of technology we don't want
and how
they should be regulated and made available. But I think there are things that regular
folk can do, we can all do. And it may sound slightly cliched or try to say it, but the
most important thing is to just not be scared of trying to understand what's going on.
Right? We have to be informed. If we're not informed about what these technologies do,
also how our own brains work too. We don't have to understand every detail,
not asking people to go and do whole neuroscience degrees and so on. But the more we understand how our own minds work,
I think the better we'll be able to make informed decisions
about the kinds of technologies that we want.
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by experts who have been where you are now and have gone where you want to go. Booking is easy And we are back with the author of Being You, a New Science of Consciousness, Anil Seth.
In the book, you talk about your experience of caring for your mother and how she had
a medical issue that caused her to have a brief period of amnesia or not necessarily
understanding who you were and what your relationship was.
I'd love for you to talk to about that personal experience, but also to people who are caring
for family members and loved ones who have cognitive decline and dementia, where this
question of, is this my mother?
Is this my father?
Is this the person that I've known? Is not a hypothetical question
and it's not a far off technological question,
but it's kind of a practical day to day question
of like, who is this person that I love and that I care for
and are they the same person they have been?
Because you've been in that situation.
So the episode I described in the book,
my mother was in a hospital for operation.
She was just shy of 80 years old. There were problems in the book, my mother was in a hospital for operation. She was just shy of 80 years old, but there were problems in the hospital.
And she had what I later learned was what the doctors call hospital induced
delirium, which I'd never heard of before.
And it's apparently very common, especially in older people.
And the name is immediately suggestive of people actually don't know what's going
on at all. It's sort of a name straight out of the 18th century, it sounded like to me.
But it's a severe disorientation, but also a change of personality. She didn't recognize
me. She thought I was somebody else and appeared to be a very different person. That resolved,
but yes, in the years since then, it's been a continual process in which she
and I have had to adapt to very different circumstances.
So there are many ways in which a person can continue to be the same person, even if they
no longer know much about who they are or where they are, who other people are.
And for me, that's been, you know, I think that's been a useful strategy.
It helps me recognize that there's a deep continuity underlying these fairly dramatic
changes, but there's nonetheless a continuity.
And of course, the same is true for us.
You know, we're changing too,
but we just don't experience the change in ourselves
because we, you know, to cut the long story there,
very short, when things change very slowly,
we tend not to perceive them as changing.
I find that to be so profound and so comforting,
it's impossible to lose it
because it is a continuous transformation through the years.
That's right. It was never there in the first place to be lost, right? It's always been this process.
And I think it's important just talking about these things to just to point out that these ideas have of course been central to many spiritual traditions in Buddhism, in a lot of meditative
practice in Hinduism as well to some extent. The idea of the self as process, as identity,
as multifaceted, as constructed. I mean, this is not news to many people from different
cultures. And what I find quite fascinating is the confluence, the convergence between these different ways of thinking.
And it's not that just science is basically telling the same story, but 2,000 years later,
it's telling a different story. It's a story in which what we are learning from the neuroscience and the philosophy,
modern philosophy about the self, I think enriches the stories that were already
there, but also vice versa. Understanding consciousness, that's part of the battle.
We come with all these preconceptions about what it is that we're trying to understand.
But actually the experience of being a self is not simple. And when we widen the lens
to other cultures and other traditions, I think we get a richer view
of what consciousness research should be about.
I feel like it would be professional malpractice
to have had a conversation about consciousness and the self
and to not ask you about drugs, hallucinogenic drugs,
and also legal anesthetic drugs, right?
Like how does the fact that I can be put under to undergo an operation and wake up and have
no memory or any possible way of accessing that time, how does that affect your ideas
about consciousness?
And then relatedly, if I can take LSD or hallucinogenic mushrooms or any of these other types of substances and change my experience of the world. How does that affect consciousness?
The more hallucinogenic drugs, in particular psychedelic drugs, emphasizes the intimate connection between consciousness and the brain.
You take a different chemical now, interfere in the brain's business with a different kind of electrochemical manipulation,
pharmacological manipulation.
And now instead of losing consciousness, it changes and it changes extremely dramatically.
So I find this very, very good evidence.
It's highly compatible with a sort of view that consciousness is something the brain
does.
You intervene in the brain and consciousness changes.
Interestingly, you can take it in a very different way.
You could take the experiences that you have on psychedelics
as some sort of insight into the nature of reality
and come to a very different conclusion that,
oh, look, I've experienced consciousness is in fact a fundamental property of the universe
and so it doesn't depend on the brain at all. It all depends on your prior, what you come into it with. I've experienced consciousness is in fact a fundamental property of the universe and
so it doesn't depend on the brain at all.
It all depends on your prior, it's what you come into it with.
For me, it sort of reinforces the dependence of consciousness on the brain.
But I think in each case, psychedelics can show, well maybe not in each case, but certainly
from the perspective that psychedelics change
the brain and that changes consciousness.
It really underlines that what we experience is a construction because you change aspects
of the brain function.
Aspects of our conscious experience that we might otherwise take for granted, we can realize are things that the brain is doing because they're
changed or they go away.
So for me, it provides a lot of insight into those aspects of consciousness which need
explaining.
And that's entirely separate from all the potential therapeutic benefits, which I think
are also very exciting, very interesting. I think
the jury is going to be out for a little while on their overall efficacy, but there's certainly
a lot of rich potential there. Thank you so much for being on the show. Thank you for your work,
and thank you for taking the time to explain it to us. Thanks, Chris. It's been a real pleasure.
Thanks a lot for having me on the show. That is it for this episode of How to Be a Better Human.
Thank you so much to today's guest, Anil Seth.
His book is called Being You, a New Science of Consciousness.
I am your host, Chris Duffy, and you can find more from me, including my weekly newsletter
and other projects at chrisduffycomedy.com.
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