Would you reroute a train to run over one person to prevent it from running over five others? In the classic “Trolley Problem” survey, most people say they would. But I wanted to test what people would actually do in a real-life situation. In the world’s first realistic simulation of this controversial moral dilemma, unsuspecting subjects will be forced to make what they believe is a life-or-death decision.

Our nervous system is fundamentally electric. We move our arm by sending a signal to the muscles that control it. That means we can bypass our brains and use electricity to control our bodies, or use our minds to control other bodies. In this episode, I explore how we can use electricity and our brains to control cockroaches, move other people’s limbs, restore motion to people who are paralyzed, and even read people’s minds.

Scientists can’t dissect living people’s brains to study their function. But by examining the behavior of people whose brains are atypical (due to stroke, injury, or being born that way), we can learn a lot about all our brains. In this episode, I travel to London to meet a blind, autistic savant with astonishing musical abilities, and I volunteer to have my own brain’s function temporarily disrupted at UCLA’s Neuromodulation Lab.

Psychology. Neuroscience. Drugs. All can be tools of interrogation. In this episode, an expert shows me how to coerce unsuspecting subjects into signing false confessions; a police psychologist questions me about my personal life after I am injected with a truth serum; and I match wits against a new brainwave-reading lie-detection method developed at Northwestern University.

Humans are the only Earthlings with complex language. But at what cost was that ability acquired? In this episode, Michael Stevens visit Tetsuro Matsuzawa to learn about his influential cognitive tradeoff hypothesis.

What happens when your brain is deprived of stimulation? What effect does being cut off from interaction with the outside world have on a person? What effect does it have on Michael, when he is locked in a windowless, soundproof isolation chamber for three days? This episode of Mind Field is both an objective and a very intimate look at Isolation.

Exactly how do placebos work? Researchers believe that, through the power of suggestion, placebos may unleash the power of our own subconscious minds to cure ourselves. I was honored to participate in McGill University’s groundbreaking study of an accessory-assisted placebo. Could a fake, non-functioning “Sham Brain Scanner” enable children with ADHD and other neurological conditions to alleviate their own symptoms?

Technology isn’t just changing our lives. It’s literally changing our brains -- and maybe for the better. In this episode, I’m a human lab rat in a groundbreaking study at UC Irvine, where scientists test how playing 3D video games affects my spatial memory. Will 10 days of gaming improve my ability to physically navigate a giant, 60-foot maze? And will an fMRI machine detect any physical changes to my brain?

There are 100 billion individual neurons in the human brain. Working together, they allow us to make sense of, and move through, the world around us. Scientists have built replicas of the human brain with computers, but no one has ever successfully made a brain out of humans. On this episode, Michael Stevens travels back to his hometown of Stilwell, Kansas, and turn it into a working brain!

We are all unique individuals. We follow the beat of our own drum. We wouldn’t throw our own beliefs out the window just to fit in...or would we? In this episode of Mind Field, I demonstrate the strong, human urge to conform, and just how far people will go to fall in with the crowd.

We may value having Freedom of Choice, but are we actually happier when we have limited choices...or even no choice at all? Do we truly have control over our decisions, or are they really predetermined by other forces? My fellow YouTubers and I have our minds read by a “box” that reveals who - or what - is really calling the shots.

What makes a hero? Dr. Philip Zimbardo, the psychologist behind the infamous Stanford Prison Experiment, now runs seminars to teach everyday people how to be heroes. But can heroism be learned? I put his unsuspecting students into a fake crisis situation to see if they would act heroically. Also, I asked employees to help me run a seemingly dangerous experiment, to see if they would blow the whistle to stop me.

What makes you, you? If even the most basic parts of you, like your memories or your past, can be forgotten or manipulated, how can you know ever really know who “you” are? In this episode of Mind Field I look at how well Do You Know Yourself?

How much of the sensations we feel is determined by our physical bodies? Maybe our minds play a bigger role than we know. I’ll see if people can be tricked into feeling intense physical pain, even though it’s all in their heads. I’ll also look at a machine that makes it possible for you to tickle yourself, and I’ll show you a weird physical illusion you can do at home.

We humans love to build, create, and organize. So why do we also love to destroy things? Can violently breaking stuff really help to calm us down, or does it just make us more angry? In this episode of Mind Field, I take a hard look at our urge to destroy.

How much do we communicate through facial expressions? Are our expressions affected by our moods, or is it the other way around? And what happens to your ability to relate to others when your facial muscles are frozen by Botox? In this episode of Mind Field, I take a look at what’s In Your Face.

Are we alone in the universe? Even if we could contact aliens, what would we say? How would we say it? And, most importantly, should we even be trying to make contact at all? This episode takes me on a journey to compose and send my own personal message into outer space.

Do psychedelic drugs really bring about self-healing and personal enlightenment? New research says they may. In this episode, I travel to the Amazonian jungle of Peru to experience the mind-expanding effects of the psychedelic brew Ayahuasca. I’m joined by Imperial College London’s Head of Psychedelic Research, Dr. Robin Carhart-Harris, who measures the impact of Ayahuasca on my brain.

If I could live forever, should I? How does being reminded of our own mortality affect us psychologically? In this episode I speak with mortician and death positivity activist Caitlin Doughty and visit a cryonics facility trying to extend human life indefinitely. Will I take them up on their offer, or will I choose to die?

In this episode I visit a researcher who is studying memory by using machine learning and neuroimaging to detect and predict people's brain states. I also travel to Japan to meet with a team working on ways to record the content of peoples’ dreams.

How are our moral decisions influenced by factors we’re not aware of? A phenomenon known as Moral Licensing claims that when we do something good, we often subconsciously allow ourselves to then do something bad. In this episode, Michael Stevens takes a look at whether those who donate money to charity become more likely to let a kid take the blame for a crime they know they committed.

So you say you love your computer or smartphone...but can it love you back? As we become more dependent on technology, and our technology becomes more lifelike, where does the line between human and computer lie? And what happens when our relationships become romantic? In this episode of Mind Field, I look into Artificial Intelligence.

How can a lie become true? In this episode, Dr. Aaron Blaisdell and I create a game show that is actually a giant "human Skinner Box" to observe the formation of superstitious beliefs. And Dr. Samuel Veissière helps me design and perform a placebo reverse exorcism, harnessing the power of belief in both science and religion to convince normal people that a spirit has possessed their bodies.

Normal people can become monsters, given the right situation. That’s the standard narrative of the Stanford Prison Experiment, one of the most famous psychological experiments of all time. But what if the cause of its participants’ cruel behavior wasn’t what we’ve always been told?