Inner Cosmos with David Eagleman
Neuroscientist and author David Eagleman discusses how our brain interprets the world and what that means for us. Through storytelling, research, interviews, and experiments, David Eagleman tackles wild questions that illuminate new facets of our lives and our realities.
Mon, March 31, 2025
EP98 "What's the future of AI relationships?" (with Bethanie Maples)
How many people are having relationships with artificial neural networks? Should we think of AI lovers as traps, mirrors, or sandboxes? Is there a clear line between relationship bots and therapist bots? And what does this have to do with Eliza Doolittle, a doll cabinet in your head, loneliness epidemics, or suicide mitigation? Join Eagleman with guest researcher Bethanie Maples to discover where we are and where we're going.
Mon, March 24, 2025
Ep 97 "Can we rewrite the human code?" (with Trevor Martin)
You're defined in part by the genome you arrive with -- so what does it mean when you can edit it? What does this have to do with viruses, copy-pasting, and whether we will modify the story of our own species? Join Eagleman with guest Trevor Martin, CEO of Mammoth Biosciences, for this week's episode about the remarkable situation we find ourselves in, now that we know how to read and write our biological inheritance.
Mon, March 17, 2025
Ep96 "What’s the future of education in an AI world?" (Part 2: Sal Khan)
Now that we’re careening into our AI future, what are the most important things for our students to learn? Do we keep teaching as we always have, do we drop our heads on the desk, or are there clever ways to steer and optimize education? What would Sal Khan, founder of Khan Academy, say about all this? Find out in this week's episode.
Mon, March 10, 2025
Ep95 "What's the future of education in an AI world?" (Part 1)
How can we rethink schools to meet the future? What does this have to do with the invention of the printing press, the prevalence of desk calculators, or the spread of Google? And how is this connected to the writer Goethe, a digital replica of the philosopher Aristotle, or the two lasting bequests that we should give our children? Join Eagleman this week for surprises about what AI means for the next generation.
Mon, March 03, 2025
Ep94 "How does the brain construct reality?"
Do you perceive red the same way I do? What is wrong with the textbook model of vision? Why do brains have so many internal feedback loops? And what does any of this have to do with Plato’s cave, Ernest Hemingway, or artificial neural networks that perceive dogs everywhere? Join Eagleman with guest Anil Seth, author of “Being You”, to explore the scientific problem of consciousness.
Fri, February 28, 2025
David Eagleman on Joy A Podcast. Hosted by Craig Ferguson
Meet David Eagleman - neuroscientist, author, and more. He is best known for his work on sensory substitution, time perception, brain plasticity, synesthesia, and neurolaw and is currently a neuroscientist at Stanford University. I thoroughly enjoyed picking his brain and I hope you enJOY too!
Mon, February 24, 2025
Ep93 "Will AI kill our creativity or enhance it?"
How will creative people make a living in a world with AI? Is there a different way to think about the economy of the future -- and how might it involve mystifying and elevating humans? What does the term “data dignity" mean? Join Eagleman with guest Jaron Lanier -- computer scientist, artist, futurist -- as they discuss AI's boundless creative output and how we might thoughtfully navigate into the future.
Mon, February 17, 2025
Ep92 "Why is it hard to keep a secret?"
How are secrets in the brain like Abraham Lincoln’s political cabinet? Will AI in the near future hide things from you? And what does any of this have to do with political hierarchies, the formula for Coca-Cola, or deceptive chimpanzees? Join Eagleman to understand what neuroscience tells us about secrets: what they are, why they weigh on us, and how they sometimes grow into tangled webs we never meant to weave.
Mon, February 10, 2025
Ep91 "What is love?"
What are we talking about neurobiologically when we talk about love? What does it have to do with how you were raised, the symmetry of someone's face, or the smell of their underarms? What do we learn from heartbreak, rom-coms, and little rodents called prairie voles? And what is the future of love & AI? Join Eagleman for a Valentine's Day special to learn what unseen sparks in the skull set the heart ablaze.
Mon, February 03, 2025
Ep90 "What's the future of connecting our tech to our brains?"
A brain's 86 billion neurons are always chattering along with tiny electrical and chemical signals. But how can we get inside the brain to study the fine details? Can we eavesdrop on cells using other cells? What is the future of communication between brains? Join Eagleman with special guest Max Hodak, founder of Science Corp, a company pioneering stunning new methods in brain computer interfaces.
Mon, January 27, 2025
Ep89 "Why do you love some flavors and not others?"
Why do you like the taste of things that your friend doesn't? Why do kids not like coffee but adults do? What does any of this have to do with smelling people’s armpits, whether women really synchronize their menstruation, whether your culture eats a lot of spicy foods, and how animals sense the world? Join Eagleman this week to understand why there's no accounting for taste.
Mon, January 20, 2025
Ep88 "Might there exist very different kinds of minds?"
Why is it so difficult to define intelligence? What does this have to do with being a fish in water trying to describe water? Might we humans possess one kind of intelligence in a constellation of many other types? And what does this have to do with empathy, AI, and our search for extraterrestrial life? Join Eagleman with guest Kevin Kelly as they dive into whether there might exist very different kinds of minds.
Mon, January 13, 2025
Ep 87 "How do we operate in the present when we perceive the past?"
Because visual signals take time to process, we live slightly in the past. So how do we ever catch a baseball? And what does this have to do with certain visual illusions, or the view in New York City, or the things you were never taught in school, or the warp drive in Star Trek? Join Eagleman this week for a mind blowing look at the strange relationship between vision and time.
Mon, January 06, 2025
Ep86 "What are emotions?"
Are emotions something that happen to you, or are they bodily signals we interpret? Does everyone show emotions in the same way -- that is, are there particular markers of the face or the body that always mean anger, sadness, or joy? And what does this have to do with Charles Darwin, the truth about facial expressions, or the movie Inside Out? Join Eagleman with this week's guest, neuroscientist Lisa Feldman Barrett, author of hundreds of papers and "How Emotions are Made", for a deep dive into the truth about our feelings.
Mon, December 30, 2024
Ep39 rebroadcast "What is the future of AI relationships?"
Why are our brains so wired for love? Could you fall head over heels for a bot? Might your romantic partner be more satisfied with a 5% better version of you? How does an AI bot plug right into your deep neural circuitry, and what are the pros and cons? And what will it mean when humans you love don’t have to die, but can live on in your phone forever? Join Eagleman for a deep dive into relationships, their AI future, and what it all means for our species.
Mon, December 23, 2024
Ep10 rebroadcast "Why is it so hard to spot a counterfeit bill?"
What do charlatans have to understand about human perception? Why are you so bad at recognizing a real penny among fakes? What did Eagleman have to do with the redesign of the Euro, and why did he campaign to the European Central Bank that all their bills should be blank with a single hologram in the middle? In this episode, explore the crossroads of perception and deception. Brief appearance from special guest Adam Savage.
Mon, December 16, 2024
Ep85 "What is a Thought?"
Brains bear thoughts like a peach tree bears peaches. Even for meditators it's almost impossible to stop the firehose of words and images and ideas. But what in the world is a thought, physically? How can you hear a voice in your head when there's no one speaking in the outside world? And what does any of this have to do with a small marine animal who eats its own brain? Join Eagleman for this week's deep dive into our inner life.
Mon, December 09, 2024
Ep84 "Why do brains love music?"
How can we understand music's effect on human brains? Is music universal or does it rely on your experiences? How is music similar to a language? Can music be leveraged to help anxiety, dementia, or Parkinson's disease? What does any of this have to do with Stevie Wonder on the high hat, or the relationship between music and color? Join Eagleman with guest Daniel Levitin -- neuroscientist, musician, and author of This Is Your Brain on Music and I Heard There Was A Secret Chord .
Mon, December 02, 2024
Ep83 "Why Do Your 30 Trillion Cells Feel Like a Self?" Part 2
Does our sense of self emerge from our brain's skill at lumping things into unchanging categories? What can we learn watching a caterpillar brain transition to a butterfly brain? Can we think of a memory as a pattern that stays alive and has its own life? Does an ant colony have a sense of self? Join Eagleman and biologist Michael Levin at Tufts – one of the most energetic and original thinkers in the field -- to dive into new territories of the self.
Mon, November 25, 2024
Ep82 "Why Do Your 30 Trillion Cells Feel Like a Self?" Part 1
Every cell in your body changes, so why do you have a sense of continuity of the self – as though you're the same person you were a month ago? What does this have to do with the watercraft of the Greek demigod Theseus, or the End-of-History illusion, or why you go through so much trouble to make things comfortable for your future self, even though you don't know that person? And if there really were an afterlife, what age would your deity make everyone for living out their eternities? Join this week for a two-parter about the mysteries of selfhood.
S3 E1 · Mon, November 18, 2024
Ep 81 "How close are we to longevity?"
Two certainties are death and taxes; a third is that people will work hard to avoid them both. But why is it so difficult to extend our lifespan? We know how to do it in worms and mice; why is it tricky in humans? Why do so few companies study longevity? What does the near future hold? What would it be like if everyone lived a much longer life? Join Eagleman this week with longevity expert Martin Borch Jensen to discuss the hopes and challenges of longevity science.
Mon, November 11, 2024
Ep51 rebroadcast "Why do brains dream?"
Why do brains dream, and why are dreams so bizarre? Why doesn't your clock work in your dreams? And even though you spend much of your working day looking at your cell phone and computer – why do they almost never make appearances in your dream content? Is dream content the same across cultures and across time? Are dreams experienced in black & white, or in color? Are dreams the strange love child of brain plasticity and the rotation of the planet? What is the relationship between schizophrenia and dreaming? In the future, will we be able to read out the content of somebody's dream? Join Eagleman this week to learn why and how we spend a fraction of our sleep time locked in different realities, swimming in plots which aren't real but which compel us entirely nonetheless.
Mon, November 04, 2024
Ep48 rebroadcast "Why do brains become depressed?"
What is depression? Why are brains able to slip into it? Is depression detectable in animals? Do animals have options beyond fight or flight? And what does any of this have to do with measuring depression medications in city water supplies, reward pathways in the brain, the prevalence of tuberculosis, and zapping the head with magnetic stimulation? Join today's episode with David Eagleman and his guest -- psychiatrist Jonathan Downar -- for a deep dive into the brain science behind depression and what new solutions are on the horizon.
Mon, October 28, 2024
Ep31 rebroadcast "Why do we see #TheDress differently?"
Why can you hear some sounds two different ways, depending on which word you’re looking at? Why do electrical outlets sometimes look like a face? How can you have rich visual experience with your eyes closed? Are some crosswalk buttons fake? Why are some pictures interpretable only once you’ve been told what to look for? And although brains are often celebrated for their parallel processing, what should they really be celebrated for? Tune in to learn what happens when the raw facts of the world collide with your expectations.
Mon, October 21, 2024
Ep1 rebroadcast "Does time really slow down when you're in fear for your life?"
When he was a child, Eagleman fell off a roof and time seemed to run in slow motion. When he became a neuroscientist, he grew curious about the experience and collected hundreds of similar stories from others. But is it true that your brain can actually see in slow motion, like Neo in the Matrix? And how would you test that? Hear how he dropped volunteers from a tower to put the science to the test, and what the answer reveals about our perception, memory, and experience of the world.
Mon, October 14, 2024
Ep80 "What's it like to never forget?"
What would it be like to have a vastly better memory than you do now? What if you could remember what you were wearing on any day a dozen years ago? Or who you were with, what the conversation was, and whether it rained? Would it be a blessing or a curse? And if you’re forgetting a lot of your life, what might you do to better remember it? Join Eagleman with actress Marilu Henner, one of only dozens of people in the world diagnosed with highly superior autobiographical memory.
Mon, October 07, 2024
Ep79 "Does everyone have different mind's eyes, mind's ears, and mind's tongues?"
When you imagine something -- like the sun peeking over a mountain during an early morning rainstorm -- do you see it with rich visual detail, or instead with very little internal picture? In an earlier episode we tackled the spectrum of visual imagination, from hyperphantasia to aphantasia -- and in this episode we dive even deeper with guest Joel Pearson to surface the most surprising differences between people's internal lives. How does your experience differ from other people's, and how does your brain cobble together the skills you have to accomplish what you need?
Mon, September 30, 2024
Ep78 "Does your brain have one model of the world or thousands?"
Why do you see a unified image when you open your eyes, even though each part of your visual cortex has access to only a small part of the world? What is special about the wrinkled outer layer of the brain, and what does that have to do with the way that you explore and come to understand the world? Are there new theories of how the brain operates? And in what ways is it doing something very different than current AI? Join Eagleman with guest Jeff Hawkins, theoretician and author of "A Thousand Brains" to dive into Hawkins' theory of many models running in the brain at once.
Mon, September 23, 2024
Ep77 "What is Life?"
How do you define what things are living and dead? You might look at a sprinting cheetah and say it's clearly alive, whereas a chunk of rock is not -- but where do we draw the line? What might we expect extraterrestrials to look like, and would we even have the capacity to recognize them? And what does any of this have to do with Frankenstein, ancient Greek philosophers, or the possibility of finding a cell phone on Mars? Join Eagleman with guest Sara Walker, theoretical physicist at Arizona State University and author of the book “Life as No One Knows It”.
Mon, September 16, 2024
Ep76 "How do you decide?" (Part 2)
Do brains time travel? What is a prediction error? What does any of this have to do with the 2008 crash of the economy, how we keep internal price tags, or a rational approach to drug addiction in society? Join Eagleman to learn how your 3-pound universe spends its whole existence nailing down choices.
Mon, September 09, 2024
Ep75 "How do you decide?" (Part 1)
When you make a decision about what food to order, what's happening in your brain? How do you clinch long-term decisions, like hitting the gym instead of doomscrolling? And what does any of this have to do with the ancient Greeks, alien hand syndrome, and constraining a president who wants to launch a nuclear bomb? Join Eagleman this week and next to discover how your brain weighs alternatives and nails down decisions.
Mon, September 02, 2024
Ep74 "Why do we laugh?"
From the brain’s point of view, what is humor? When something is funny, why do we breathe in and out rapidly? Do other animals laugh? Why do most jokes come in threes? What do mystery novelists, magicians, and comedians have in common? Could AI be truly funny? Join Eagleman this week to appreciate the tens of reasons and millions of years behind the tickling of your neural pathways.
Mon, August 26, 2024
Ep73 "How do we fool ourselves in the stock market?"
What does neuroscience have to do with investment, and what does that have to do with Isaac Newton, the Dutch East India company, Kodak, the way zebras herd, our emotions, and almost 200 cognitive biases? Join Eagleman with guest Mark Matson, whose new book The American Dream dives into the cognitive illusions we face when trying to make investments.
Mon, August 19, 2024
Ep72 "How do you put yourself in other people's shoes (and can AI do it)?"
You know that moment in the horror movie where the monster is coming closer, but the movie star doesn't see it? Why does that drive you crazy, and what does that teach us about brains? What is theory of mind, and why is it so important for everyone from poker players to conmen to stage magicians to novelists? Join us this week to dive into a fundamental skill of human brains -- and the question of whether current AI has any ability to simulate other people's minds.
Mon, August 12, 2024
Ep71 "Why do our memories drift? Part 2: Misremembering yourself"
Is your notion of yourself built on narrative that may or may not be accurate? If someone told you an entirely false story about yourself, could you come to believe it? What does that have to do with six people who spent over a decade in prison together for a crime they didn't commit? Join Eagleman for part 2 of some mind-blowing conclusions about your account of your own life.
Mon, August 05, 2024
Ep70 "Why do our memories drift? Part 1: The War of the Ghosts"
Why did lions look so strange in medieval European art? What does this have to do with Native American folklore, eyewitness memory of a car accident, or what a person remembers 3 years after witnessing the 9/11 attack on the World Trade Center? And what does any of this have to do with flashbulb memories, misinformation, and the telephone game that you played as a child? Join Eagleman for part 1 of an astonishing journey into what we believe about our memories.
Mon, July 29, 2024
Ep69 "Why do you see something everywhere after you've seen it once?"
What does the Baader-Meinhof Group, a West German terrorist group from the 1970s, have to do with the front of your brain, attention, salience, and synchronicity? And why might you soon hear about the Baader-Meinhof Group again, not for political reasons, but for reasons to do with your own neural networks? Join Eagleman for a dive into how we take in the world around us -- and how we get fooled about the frequencies of events.
Mon, July 22, 2024
Ep68 "What if our brains worked a trillion times faster?"
Why are the majority of stock trades decided by algorithms at timescales we can scarcely conceive of? What is it like to have the speed and power of a computer, and to be dealing with slow humans? Why are movies compelling, given that they are just a series of photographs flashed rapidly? And what happens if we someday discover planets with creatures who operate on totally different time scales? Join Eagleman this week for a deep dive into speed: the speed at which we operate, the speed at which our machines operate, and what this all means for the future as the divergence grows larger.
Mon, July 15, 2024
Ep67 "How did human brains get runaway intelligence? "
We're the single species who composes symphonies, erects skyscrapers, builds computers, and regularly gets off the planet. But how did human intelligence evolve from our ancestors in the animal kingdom? And now that our species is scintillatingly shrewd, what does a knowledge of our road mean as we work to build intelligence artificially? Join Eagleman this week with Max Bennett, an especially smart human who illuminates a path through the 600 million year story of brain power in his book "A Brief History of Intelligence".
Mon, July 08, 2024
Ep66 "Why do brains love conspiracy theories?"
Why are conspiracy theories a natural output of the brain? What do they have to do with puzzle-solving, cognitive dissonance, ingroups/outgroups, and storytelling? If you hear an unlikely explanation for something, what are effective and ineffective ways to assess it? Join Eagleman to understand from the point of view of the brain why conspiracy theories have always been so pervasive in human societies.
Mon, July 01, 2024
Ep65 "Why do brains so easily fall for magic tricks?"
Did magicians discover tricks of the mind centuries before neuroscientists? Why can’t you see what they’re doing right in front of you? How do magicians steer your attention or appear to read your mind? Dive into the trapdoors of the human brain which allow the mind to get fooled. Join Eagleman with several guests: magician Robert Strong and cognitive neuroscientists Stephen Macknik and Susana Martinez-Conde.
Mon, June 24, 2024
Ep64 "Why do familiar things lose their shine (& what can we do about it)? "
If you could get a kiss from your favorite celebrity, how long would you want to wait before receiving it? And why do things seem less meaningful or joyful over time than they were at the beginning? What does any of this have to do with Netflix releasing all the episodes of a new show at once, or why companies come out with new and improved products every year, or why French revolutionaries wanted to make a week five days long instead of seven? Join Eagleman and cognitive neuroscientist Tali Sharot to find out why everything dulls with time and what we can do to recover the shine.
S2 E63 · Mon, June 17, 2024
Ep63 "Why do brains love faces?"
Why do we have so much circuitry in the brain devoted to faces? Why does your electrical plug seem to look like a little face? Did aliens plant a signal for us on Mars, or are we looking at a quirk of our own brains? What is face blindness and what is a super recognizer? What does any of this have to do with looking at a magazine upside down, or why computer algorithms sometimes think a jack-o'-lantern is a person? Join Eagleman for a deep dive into something so fundamental as to be typically invisible.
Mon, June 10, 2024
Ep62 "Is it possible to rehumanize the enemy?"
The brain easily forms ingroups and outgroups – and shows different responses when viewing one or the other. At the extreme, the brain stops seeing outgroup members as people, but more like objects. But are there ways to rehumanize? And in this context, what do heroes look like? In this episode, Eagleman talks with two men -- Maoz Inon and Aziz Abu Sarah -- one Israeli and one Palestinian. The two men, full of pain and sorrow, are fighting. But they are fighting side by side. They are fighting to repair the future. Learn what peacebuilders are, how they function, and what this has to do with the neuroscience of dehumanization, ingroups, outgroups, and the possibilities -- both political and neural -- for rehumanization.
Mon, June 03, 2024
Ep61 "When should you (not) trust your intuition?"
Why do you sometimes feel that you trust this person but not that one -- for reasons you can't quite put your finger on? What signals does the brain vacuum up in your daily life, and what fraction of those does your conscious mind have access to? When does intuition steer us wrong? And what is the future of intuition, as we build new technologies to take the myriad signals racing around in the dark of our brains and bodies and bring them to light? Join Eagleman and his guest, cognitive neuroscientist Joel Pearson, to unpack when to trust and when to ignore the signals of intuition.
Mon, May 27, 2024
Ep60 "Can we think better by wrestling with conflicting ideas?"
Why do we believe our own truths so strongly? What is steel-manning, and why is it so important? What does any of this have to do with F. Scott Fitzgerald, John Keats, or the future of our society? This week's episode deals with polarization and what we might do about it. Join Eagleman and his guest Isaac Saul, who works to represent different points of view in his newsletter Tangle -- all in the name of the intellectual humility that can blossom from grappling with conflicting ideas.
Mon, May 20, 2024
Ep59 "Do you visualize like I do?"
How do brains picture things internally, and how might you and I imagine differently? How have recent discoveries completely changed the debate and the way we understand internal experience? What does this have to do with Disney's Fantasia , or Pixar's aphantasia? Strap in for some very wild surprises today about our internal experiences, with guest Ed Catmull, founder of Pixar Studios.
Mon, May 13, 2024
Ep58 "What do brains teach us about whether AI is creative?"
From a neuroscience point of view, what is creativity? How does it shine light on the current lawsuits over large language models and whether they produce anything fundamentally new... or are simply remixing the old? How do the arts expose something important about what's happening in the human brain? What do we know about the cultural evolution of ideas? And what does any of this have to do with how cell phones got their names, and why koala bears don’t write novels? Join Eagleman and his guest, composer Anthony Brandt, as they uncover the surprises about creativity.
Mon, May 06, 2024
Ep57 "When should new technologies enter the courtroom?"
Can we measure a lie from a blood pressure test, or pedophilia from a brain scan? And how should a judge decide whether the technology is good enough? What does this have to do with Ronald Reagan, or antisocial personality disorder, or how the television show CSI has impacted courtrooms? Today’s episode lives at the intersection of brains and the legal system. When are new neuroscience techniques allowed in courts, and when should they be?
Mon, April 29, 2024
Rebroadcast of Ep7 "Is AI truly intelligent? How would we know if it got there?"
David is taking his birthday week off and wanted to re-share this episode due to it's ongoing relevance. Modern AI is blowing everyone’s mind. But is it intelligent like humans, or is it just playing impressive statistical games? Could AI reach or exceed our level of intelligence, and how would we know when it gets there? Traditional tests for intelligence (Turing test, Lovelace test, etc) have long been surpassed, so Eagleman proposes a new kind of test.
Mon, April 22, 2024
Ep56 "Why do we care so much about touch?"
Why does a cold pool feel warmer the second time you dip your toes in? Why does a safecracker run his fingers over sandpaper? Why do Mediterranean cultures touch each other more than Scandinavian cultures? Would it be great -- or not so great -- if you were unable to feel physical pain? Why does stubbing your toe have different sensations through time? And what does any of this have to do with cuddle puddles, NBA players bumping chests, or puppies sleeping in dog piles? Today’s episode is a love story about our sense of touch: what it is, how it works, and why it plays such a critical role in our lives.
Mon, April 15, 2024
Ep55 "Could a brain plugin instantly teach you to fly a helicopter?"
Could you instantaneously learn to fly a helicopter -- not by practicing, but instead by uploading instructions directly to your brain? What would society do if children no longer had to go to school? And what does any of this have to do with suntan booths, nanorobots, or what a cowboy on a hill is not able to see? Join Eagleman to learn about the possibility of modifying the microscopic structure of your brain and leapfrogging education. What are the possibilities, the caveats, and the unexpected complexities?
Mon, April 08, 2024
Ep54 "Where do you end and others begin?"
From the brain’s point of view, what is the self? How do 30 trillion cells come to feel like a single entity? Does the "self" of a blind person include the tip of her walking stick? How flexible is our sense of self? And what does any of this have to do with psychedelics, trauma, synchronized swimmers, religious rituals, cheerleaders, or why soldiers across time and place love to march in lockstep? Join Eagleman for this week's episode of surprises about how the brain computes the self.
Mon, April 01, 2024
Ep 53 " Can societies fight better? "
Presumably we're not going to solve the problem of conflict between groups of people -- but what would better conflict look like? And what does that have to do with brains, the spread of homo sapiens, social media recommender algorithms, tribalism, intellectual humility, or the Iroquois Native Americans? Join this week's episode with guest Jonathan Stray -- a conflict researcher -- for an episode about brain science, war, empathy, outgroups, and how we might do better.
Mon, March 25, 2024
Ep 52 "What is lucid dreaming?" (Sleeping & Dreaming Part 3)
Can you become conscious inside a dream? Can a researcher convey information to a dreamer, and can the dreamer find some way to answer back? Does 10 seconds inside a dream equal 10 seconds in real life? Could taking a drug inside a dream give you a placebo effect? Can you prompt your brain like a large language model? And if so, what would you pose to your unconscious brain? Join David Eagleman and guest Jonathan Berent to discover the what, why, and how of lucid dreaming.
Mon, March 18, 2024
Ep 51 "Why do brains dream?"
Why do brains dream, and why are dreams so bizarre? Why doesn't your clock work in your dreams? And even though you spend much of your working day looking at your cell phone and computer – why do they almost never make appearances in your dream content? Is dream content the same across cultures and across time? Are dreams experienced in black & white, or in color? Are dreams the strange love child of brain plasticity and the rotation of the planet? What is the relationship between schizophrenia and dreaming? In the future, will we be able to read out the content of somebody's dream? Join Eagleman this week to learn why and how we spend a fraction of our sleep time locked in different realities, swimming in plots which aren't real but which compel us entirely nonetheless.
Mon, March 11, 2024
Ep50 "Why do we spend 1/3 of our lives asleep?" (Sleeping & Dreaming Part 1)
Why do we spend 1/3 of our lives in the strange doppelganger state of sleep? Can we die from a lack of sleep? How long is it possible to keep yourself awake (and why does the Guinness Book of World Records no longer track that)? Why are some people night owls and some morning larks? What does any of this have to do with lightless underground caves, or with the length of a day on Mars? Join this week's episode to learn everything you've ever wanted to know about sleep and what your brain is actually doing during this time. This is the first of a 3-parter: next week we'll dive into dreams, and the week after that into lucid dreams.
Mon, March 04, 2024
Ep49 "Can you read the brain to detect a lie?
Could you get convicted of a crime based on your brain activity? Are brain scan lie detectors accepted in court, or would that count as illegal search and seizure? And what does this have to do with your mouth getting dry, the orbits under your eyes getting hot, and your voice constricting when you deceive? Join Eagleman to dive into the fascinating topic of whether societies can use technology to figure out whether a person is telling the truth -- and under what circumstances we would even want to go there.
Mon, February 26, 2024
Ep48 "Why do brains become depressed?"
What is depression? Why are brains able to slip into it? Is depression detectable in animals? Do animals have options beyond fight or flight? And what does any of this have to do with measuring depression medications in city water supplies, reward pathways in the brain, the prevalence of tuberculosis, and zapping the head with magnetic stimulation? Join today's episode with David Eagleman and his guest -- psychiatrist Jonathan Downar -- for a deep dive into the brain science behind depression and what new solutions are on the horizon.
Mon, February 19, 2024
Ep47 "Wheels rotate backwards on TV, but do they ever in real life?"
Do our visual systems see in frames like a movie camera or instead analyze the world continuously? Why do you see multiple hands when you clap under yellow street lamps? How did Hollywood launch from the question of whether all four legs of a galloping horse come off the ground at once? And what is the very surprising thing that happens if you stare at your ceiling fan for a long time while it turns? This week’s episode is about visual perception -- and a series of eye-opening revelations about how the brain takes in information from the world.
Mon, February 12, 2024
Ep46 "Who says you're dead?"
Can a person be declared legally dead even though he is very much alive? In December of 2010, why did a number of families choose to pull their loved ones off life support just before the new year? How do doctors decide when you've died, and how is it different from how lawyers decide? How is death a process rather than an event? What does any of this have to do with getting buried alive, your family's religious beliefs, or whether a head stays alive after the guillotine? Join Eagleman and guest Jacob Appel, an emergency room psychiatrist and head of ethics, for an episode about the science and the questions about death -- including who's domain it is to call it, and where this is all heading.
Mon, February 05, 2024
Ep45 "Why did a man shoot himself after hearing the lottery numbers?" (Time Traveling: Part 3)
Who is the most disappointed medalist at the Olympics? How do brains simulate what might have been? How can you get your kid to wear a jacket in the cold? What if you had to face more successful versions of yourself? And what does any of this have to do with why menus should be shorter, why empires divide, and why you should always put yourself in the shoes of future people? Join Eagleman to learn the capstone secrets of mental time travel, and what these have to do with the emotions of regret and relief.
Mon, January 29, 2024
Ep44 "Why can't you tickle yourself?" (Time Traveling Part 2)
Why are people who can't remember their past also unable to picture their future? Why do we get so anxious about the world changing around us? What should you advise the president if we find ourselves at war with extraterrestrials? And what does this have to do with Wayne Gretzky, or the Greek goddess of memory, or hitting a bottle to get ketchup onto your French fries? Join this week's episode to find out about one of the most important things brains do: simulations of possible futures.
Mon, January 22, 2024
Ep43 "How do we remember?" (Time Traveling Part 1)
How do billions of neurons store your home address, your ability to ride a bike, and the history of your life? How does memory work in the brain, and how is it different from the way a computer stores information? And what does any of this have to do with the Happy Birthday song, squirrels hiding acorns, bards memorizing epics, or people who cannot forget any of the events of their life? Join Eagleman to learn how and why your brain continually time travels to previous moments.
Mon, January 15, 2024
Ep42 "Is there any such thing as true news?" (Truth Part 3: Artificial Intelligence)
What role will AI play in the future of fake news and misinformation? What does this have to do with our brains’ internal models, with voice passwords, and with what Eagleman calls "the tall intelligence problem"? And why does he believe that these earliest days of AI are its golden age, and we are quickly heading for a balkanization? Join for today's episode about truth, misinformation, and artificial intelligence.
Mon, January 08, 2024
Ep41 "Is there any such thing as true news?" (Truth Part 2: the Internet)
What is the future of misinformation on the internet? Is it possible that the invention of the internet has improved access to truth? What does any of this have to do with the Oxford English Dictionary, Soviet agriculture, liberation technology, Kenyan elections, Barbra Streisand's house, and Twitter revolutions? Join Eagleman for a surprising foray into the thorny forest of truth in the age of the internet.
Mon, January 01, 2024
Ep40 "Is there any such thing as true news?" (Truth Part1)
We all worry about fake news. But is misinformation and disinformation really new? Join Eagleman for a deep dive into the past, present, and future of truth. Why do cameras not tell us what we think they do? What should we not forget about pamphleteering? And what does this have to do with agriculture in the USSR, or book banning in America, or dog whistles, or apps that only tell facts? And why is it so hard to understand the viewpoints of millions of brains at once? This week's episode is the first of a three-parter -- and today we tackle truth in the media.
Mon, December 18, 2023
Ep39 "What is the future of AI relationships?"
Why are our brains so wired for love? Could you fall head over heels for a bot? Might your romantic partner be more satisfied with a 5% better version of you? How does an AI bot plug right into your deep neural circuitry, and what are the pros and cons? And what will it mean when humans you love don’t have to die, but can live on in your phone forever? Join Eagleman for a deep dive into relationships, their AI future, and what it all means for our species.
Mon, December 11, 2023
Ep38 "Why is it hard to teach an old brain new tricks?"
Is it always harder to teach an old dog new tricks? Why is an older person slower to learn a new language but able to learn new faces easily? Why does Arnold Schwartzenegger have an accent but Mila Kunis doesn’t, even though neither spoke English as a child? Why is there a correlation between how tall a person is and how much salary they're likely to earn? What would it mean to say that you are born as many people but die as a single one? This week's episode dives into surprises about brain plasticity and why your flexibility changes throughout your lifetime.
Mon, December 04, 2023
Ep37 "What is Insanity?" Part 2
What does the insanity defense mean in a court of law? And is there such a thing as temporary insanity? Is the twinkie defense a real thing? Can someone use premenstrual syndrome as a defense? And what does the legal wrestling around insanity tell us about the differences between brains: yours and other people’s, or even yours one day and yours the next day? How does law comport with science, and how are they sometimes like two people with quite different ways of looking at the world? Join to find out what happened to Andrea Yates, how the legal system deals with mental illness, and so much more.
Thu, November 30, 2023
Inner Cosmos Inbox 2
Eagleman answers listeners questions.
Mon, November 27, 2023
Ep36 "What is Insanity?" Part 1
What is the insanity defense? Are some people’s brains so different that it makes sense to use a different legal category? How does a legal system decide where the dividing line is? How are science and law strange bedfellows? Join us for the first of two episodes about the insanity defense: where it comes from, where it's going, and why it is so difficult to decide where to draw our societal lines.
Mon, November 20, 2023
Ep35 "What sticks in your brain and what doesn’t? "
f you look at a brain, how can you immediately tell if it belongs to a piano player or a violinist? How can a dog learn how to walk on its rear legs? And what does this have to do with expertise, or the good news about the brains of digital natives, or how governments respond to change just like brains do? While we all like to talk about brain plasticity, the truth is that most of what happens in your life makes no meaningful change to your brain. So what’s the difference between the stuff that sticks and the stuff that doesn’t?
Mon, November 13, 2023
Ep34 "What is intelligence?"
What would it be like to have a much lower or higher IQ than you currently have -- for example, to be a squirrel or an advanced space alien? This week's episode is about intelligence. What is it and what is its history and future? Join Eagleman on a whistle-stop tour of several schools of thought about what intelligence might mean in the brain.
Mon, November 06, 2023
Ep33 "Why do they start sprinters with a bang instead of a flash?"
Why do they use a gun at the Olympics? And why can you get off the blocks after the bang but still be disqualified for jumping the gun? Few things are as bizarre as our time perception. From sprinters to basketball players, from Kubla Khan to Oppenheimer, from television broadcasting to hallucinations, Eagleman unmasks illusions of time that surround us. Why does the brain work so hard to pull off editing tricks? And what does this tell us about our perception of reality?
Mon, October 30, 2023
Ep32 "Is death reversible?"
Does life end inevitably or instead only because we don’t understand biology well enough yet? Today’s episode is about understanding what happens when your molecular cycles grind to a halt... and whether there's anything we can do to hit control-Z. Join Eagleman and his guest Dr. Zvonimir Vrselja to dive into the weird possibility of understanding cells well enough to reverse death.
Wed, October 25, 2023
Inner Cosmos Inbox 1
Eagleman answers listeners questions.
Mon, October 23, 2023
Ep31 "Why do we see #TheDress differently?"
Why can you hear some sounds two different ways, depending on which word you’re looking at? Why do electrical outlets sometimes look like a face? How can you have rich visual experience with your eyes closed? Are some crosswalk buttons fake? Why are some pictures interpretable only once you’ve been told what to look for? And although brains are often celebrated for their parallel processing, what should they really be celebrated for? Tune in to learn what happens when the raw facts of the world collide with your expectations.
Mon, October 16, 2023
Ep30 "What does it mean to know thyself in the age of neuroscience?" Part 2
Can we explain our rich experience of life only by studying the molecules that compose us? How is the color of your passport related to your chances of presenting with schizophrenia? Males are more predisposed to commit crime, so why don’t all males commit crime? And what does any of this have to do with traffic jams, why Seinfeld is funny, and how we’re ever going to come to know ourselves from studying biology? Join Eagleman to talk about levels of understanding, what a meaningful explanation would look like, and the possibility that we are not near the conclusion of science's journey, but instead near the beginning.
Mon, October 09, 2023
Ep29 "What does it mean to know thyself?" Part 1
Did Joan of Arc turn the tide of the 100 Years War as the result of a brain disorder? Would you appreciate Taylor Swift if you only had an internal camera to watch her vocal chords? What do almost all drugs of abuse have in common? How can the tiny molecules of rabies virus control your behavior? Join Eagleman on a two-part deep dive into the fundamental question of how biological insights can shed light on the ancient question of who we are.
Mon, October 02, 2023
Ep28 "Does your language shape your thinking?"
Are there really dozens of words for snow in northern cultures? What did the movie Arrival have to do with language and cognition? Why are Russians better than Americans at distinguishing certain shades of blue? And what does any of this have to do with space, time, gender, and how your language influences your thought? Join Eagleman and his guest, cognitive scientist Lera Boroditsky, as they take a deep dive into the intersection of words and understanding.
Mon, September 25, 2023
Ep27 "Can we read brains at an airport to know who's going to bomb a plane?"
Can your thoughts be read with neurotechnology? When is measuring the brain like reading the mind? How close or far are we from being able to know if you're thinking about some particular thing you did or intend to do? What's hype and what's real? Join Eagleman for a deep dive into mind reading: what it means, where we are now, and whether your thoughts could ever be readable with new technologies.
Mon, September 18, 2023
Ep26 "Why do people dislike moist more than moose, but not as much as merts?"
We all know people who hate the word "moist". But why are they fine with synonyms such as "damp" or "wet"? What’s going on in their brains, and what does this have to do with synesthesia, autism, shapes, slacks, and sound probabilities? Join this week's episode as Eagleman leads us into the new and wild world of word aversion.
Mon, September 11, 2023
Ep25 "Why are we so easy to fool?"
Why are we humans so easily deceived? What are the tricks of the trade, and how can we train ourselves to be more aware of them? What does all this have to do with Theranos, forged letters, and the shell game? Although you presumably wouldn't cheat a stranger out of all her money, there are people who would -- so how can we beef up our immunity against deception? Join Eagleman with guests Christopher Chabris and Dan Simons to discuss their new book, Nobody's Fool .
Mon, September 04, 2023
Ep24 "What does drug withdrawal have in common with heartbreak?"
Why do you still feel the waves after getting off a boat? Why does the wall seem to come at you faster after you step off the treadmill? Why do the rocks seem to move upward after you stare at a waterfall? Why did people in the 1980s think their book pages had some red color in them… but no one thought that before or after the 80s? And what does any of this have to do with drugs, heartbreak, yellow sunglasses, or Aristotle watching a horse stuck in a river? Join Eagleman to understand how the brain constantly readjusts its circuitry to best read the world, and what it means for our (sometimes strange) perceptions of what's out there.
Mon, August 28, 2023
Ep23 "How can we learn to speak alien?"
If we meet extraterrestrials someday, how will we figure out what they're saying? We currently face this problem right here at home: we have 2 million species of animals on our planet... and we have no Google Translate for any of them. We’re not having conversations with (or listening to podcasts by) anyone but ourselves. Join Eagleman and his guest Aza Raskin to see the glimmer of a pathway that might get us to animal translation, and relatively soon.
Mon, August 21, 2023
Ep22 "What do we find beautiful?"
Why do briefly glimpsed people appear to be more attractive? Why did portrait photographers put Vaseline on their lenses, and what does that have to do with Instagram filters? Why are thirsty people more likely to perceive something as transparent? And what does any of that have to do with mating, optimal decision making, puberty, frogs, and movie stars? In this episode, Eagleman gets us to view the familiar as strange as we examine beauty, instincts, and what drives us.
Mon, August 14, 2023
Ep21 "How far would you follow authority?"
Would you torture someone if you were commanded by an authority figure? To what degree are your decisions contextual, and what does this have to do with matching the length of a line, the Iroquois Native Americans, the banality of evil, soldiers posing with dead bodies of their enemies, propaganda, giving shocks to a stranger, or how we should educate our children? Join Eagleman for part 2 of the exploration into brains, dehumanization, and what we can do to improve our possible future.
Mon, August 07, 2023
Ep20 "Why does your brain care more about some people than others?"
Why do we so naturally form ingroups and outgroups? And what does that have to do with evolution, monkeys, Greeks, psychopaths, Syndrome E, and propaganda posters? Join Eagleman to learn why our brains are so wired for tribalism, what the consequences are for the world, and how a bit of knowledge goes a long way to making us more immune to propaganda.
Mon, July 31, 2023
Ep19 "How far can you trust your memory?"
How good is your memory, really? Why do we feel so certain about our memory, even while it is so suspect? Can something told to you after an event change your memory of the event? Why is it so hard to reconstruct a face? Is there a relationship between confidence and accuracy? How is your ability to remember a scene changed if there's a gun pointed at you? Join Eagleman to find out why eyewitness testimony is the most questionable technology we allow in courts.
Mon, July 24, 2023
Ep18 "Could you upload your brain to live forever?"
How would we know if we were living in a simulation? What if you were a butterfly having a dream it was a human? What does any of this have to do with John Lennon, or Renee Descartes, or freezing yourself in a vat of liquid nitrogen? How will we eventually solve the problem that human bodies can’t do space travel? Join Eagleman for a wild ride into the strange possibility of making brains immortal.
Mon, July 17, 2023
Ep17 "What is consciousness?"
How do your billions of tiny brain cells build consciousness as they chatter away with electrical spikes and chemical signals? And why is your laptop, with its sophisticated algorithms and billions of parts, presumably not conscious? Could other large systems like a city become conscious? And what does this have to do with ant hills, blue birds, or your memory of your first kiss? Join Eagleman on a journey into one of the central mysteries of neuroscience: why we have awareness.
Mon, July 10, 2023
Ep16 "Why is everyone who disagrees with you misinformed?"
Why is there so much polarization, and what does this have to do with neuroscience? Why do people on all sides of the political spectrum feel that if they could shout loudly enough in all caps on Twitter, everyone would come to see they’re right? And what does any of this have to do with literature, genetics, nobleman Lord Gordon, bumperstickers, visualization, or the Iroquois Native Americans? Join as Eagleman draws from distant fields to show why we always feel so certain we know the truth.
Mon, July 03, 2023
Ep15 "What should happen when someone with a brain tumor breaks the law?"
When does neuroscience overlap with the legal system? Do we have free will or don't we? Did changes in Charles Whitman's brain have something to do with him becoming a mass shooter? Why was the heir to the Gucci fashion fortune killed by his wife? Join Eagleman on a wild journey to understand what happens when the study of the brain and the law end up in the same courtroom.
Mon, June 26, 2023
Ep14 "Why do we have so little access to what’s happening under the hood?"
Who is doing the choosing when you make a choice? Is there someone in your head but it’s not you? What is a chicken-sexer, and what do they have to do with British plane spotters during WWII? Do we have free will or don’t we? Dive in to discover the ways in which you typically operate with no conscious access to your behaviors.
Mon, June 19, 2023
Ep13 "Will you perceive the event that kills you?"
How far in the past do you live? Why are live television shows not actually live? What does any of this have to do with nuclear bombs, car accidents, plane crashes, volcanos, or the last episode of the Sopranos? Join Eagleman in a mind-bending dive into the neuroscience of time and what it could mean for your last moment.
Mon, June 12, 2023
Ep12 "Can we create new senses for humans?"
Can a blind person come to see through her tongue? What would it be like to smell with the nose of a dog? How can we perceive streams of information that are normally invisible to us? And what does any of this have to do with pilots or Westworld or tinnitus or friendly fire or a wristband with vibratory motors? We don't detect most of the action going on in the world around us... and today we'll explore how technology might change that.
Mon, June 05, 2023
Ep11 "What does dreaming have to do with the rotation of the planet?"
Why are some of the best musicians blind? Can blind people learn how to echolocate, like a bat? What do your nightly dreams have to do with the rotation of the planet? Once we find alien life on other planets, should we expect that aliens have dreams at night? Find out why dreaming might be the strange lovechild of brain plasticity.
Mon, May 29, 2023
Ep10 "Why is it so hard to spot a counterfeit bill?"
What do charlatans have to understand about human perception? Why are you so bad at recognizing a real penny among fakes? What did Eagleman have to do with the redesign of the Euro, and why did he campaign to the European Central Bank that all their bills should be blank with a single hologram in the middle? In this episode, explore the crossroads of perception and deception. Brief appearance from special guest Adam Savage.
Mon, May 22, 2023
Ep9 "What does eating that cookie have to do with the hero of the Trojan war?"
We all have goals, and we all face temptations that get in the way. So what's happening in the brain when we act in a manner that isn't in accordance with who we want to be? Computers don’t have these problems, but being human can be tough. In the previous two episodes we exposed the rivaling networks battling it out under the surface. Today we’re going to talk about the gap between what you intend to do and what you actually do when temptation is there.
Mon, May 15, 2023
Ep8 "How does your brain decide what to buy?"
What’s happening when you stand in the supermarket aisle and stare at the shelf full of options? It may not look like there’s much going on from the outside, but inside there’s a war of networks raging. How is your brain's decision-making influenced by price, emotions, and your group of friends? How would you choose between a nice candle and a chocolate bar in the shape of a computer keyboard? And what does any of this have to do with Starbucks or Tiger Woods or Burger King?
Mon, May 08, 2023
Ep7 "Is AI truly intelligent? How would we know if it got there?"
Modern AI is blowing everyone’s mind. But is it intelligent like humans, or is it just playing impressive statistical games? Could AI reach or exceed our level of intelligence, and how would we know when it gets there? Traditional tests for intelligence (Turing test, Lovelace test, etc) have long been surpassed, so Eagleman proposes a new kind of test.
Tue, May 02, 2023
Ep6 "What will AI mean for artists?"
Will writers, artists, and musicians find themselves unemployed by AI? What are the new capabilities we’re seeing and what does it all mean for human creativity? And what does this have to do with diamonds, Westworld, effort, Frankenstein, photography, Beethoven, and the Stark family in Game of Thrones?
Mon, April 24, 2023
Ep5 "How is your brain like a team of rivals?"
Would you kill one person to save the lives of five others? Why do you find yourself on the horns of a dilemma when someone offers you a chocolate cake? How can you believe different things at once? Find out what's running under the hood in this first episode of a three-parter about our decision making -- and how a little knowledge of neuroscience can allow us to make better decisions.
Mon, April 17, 2023
Ep4 "Do people experience different realities?"
Do you see blue the same way I do on the inside? Why do some people think the northern lights make noise? Why do you think the low note on the piano is larger, and the high note brighter? Join Eagleman on a wild ride into the world of synesthesia, a topic his neuroscience laboratory has pioneered for years.
Mon, April 10, 2023
Ep3 "Could animals learn to speak human?"
What is intelligence? Why don’t gophers write novels? Why didn't crows invent the internet? And what does any of this have to do with brain algorithms, finding aliens on earth, and why World War 5 could involve species besides Homo sapiens?
Mon, April 03, 2023
Ep2 "What would you do with robotic wings? (or How to get a better body)"
How is it possible for a dog to become a champion surfer? Why does the world’s best archer have no arms? Why might someone come to believe that her leg doesn’t belong to her? How can we build robots that simply figure themselves out? In this episode, Eagleman unmasks mysteries about the brain's shocking flexibility -- revealing how it comes to drive whatever body it finds itself in, how it determines what the "self" is, and what this tells us about our future as humans.
Mon, March 27, 2023
Ep1 "Does time really slow down when you're in fear for your life?"
When he was a child, Eagleman fell off a roof and time seemed to run in slow motion. When he became a neuroscientist, he grew curious about the experience and collected hundreds of similar stories from others. But is it true that your brain can actually see in slow motion, like Neo in the Matrix? And how would you test that? Hear how he dropped volunteers from a tower to put the science to the test, and what the answer reveals about our perception, memory, and experience of the world.
Trailer · Mon, March 20, 2023
Introducing: Inner Cosmos with David Eagleman
Neuroscientist and author David Eagleman discusses how our brain interprets the world and what that means for us. Through storytelling, research, interviews, and experiments, David Eagleman tackles wild questions that illuminate new facets of our lives and our realities.
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