The Hole In Your Brain That Makes You Doomscroll

Source: The Hole In Your Brain That Makes You Doomscroll, The Rest Is Science, 46:17, uploaded 2026-07-19, Watch Later position 15.

Hannah Fry begins by giving Michael Stevens a sealed envelope with his name on it. She refuses to let him open it, then says that a card inside will become more tempting as the episode continues. The small act of withholding turns into the subject itself. Why does a closed envelope, a locked box, or a headline promising that “number one is mind-blowing” create such a strong need to know?

Curiosity against self-preservation

Fry starts with a 2016 experiment involving 54 students and a bowl of joke pens. The researchers tell one group which pens are safe and which will deliver an electric shock. Those students leave the pens alone. Another group hears only that some pens are safe and some are dangerous. The missing information changes their behaviour. They handle the pens about five times as often, despite having no prize to win and no game to complete. They want to discover which pens will shock them, and some of them find out by being shocked.

The researchers call this the Pandora effect. Fry uses it to frame curiosity as a drive that can overrule self-preservation. Schools put up banners that praise curiosity in children, yet the older stories attached to the impulse often end in pain. The question becomes evolutionary as well as moral. A trait that sends an animal towards danger needs to offer some benefit that makes the risk worthwhile.

From vice to virtue

For roughly 1,500 years, the culture Fry describes treats curiosity as a vice. Augustine, writing around 400 CE, calls it a “lust of the eyes” and describes it as a disease. Aquinas separates curiositas, the bad desire to know, from studiositas, the approved form of study. Questions about the world can therefore become sinful when they move beyond the knowledge that religious authority permits.

The old stories give the impulse a female body and a bad ending. Pandora wants to know what lies in the box. Eve wants to taste the apple. Lot’s wife turns back to look at Sodom and becomes a pillar of salt. The speakers notice the repeated figure of the foolish curious woman, then connect the moral to a culture in which scripture supplies the final truth. Fry suggests that curiosity also had a political use as a category of control: if people can decide what is known, they can decide more than an authority wants them to decide.

The reversal begins around the scientific revolution. Fry describes small groups such as the Academy of Secrets, which tried to ask questions that the Inquisition then shut down. The telescope and microscope change the status of hidden knowledge because they reveal a world full of things that can be investigated. The Enlightenment and the scientific revolution follow as periods in which discovery gives curiosity public value. The source places the change around the 1600s, although the caption track mangles the exact date.

Fry also reads the change through language. Curiositas comes from the Latin cura, meaning care, which shares a root with words such as cure and curator. Before the middle of the seventeenth century, she says, “curiosity” barely appears in English. By 1700 it has become common. The older saying was “care killed the cat”, first recorded in 1598. “Curiosity killed the cat” appears later, around 1900, after the meaning of the word has changed from anxious concern to a desire to investigate.

The episode keeps that long reversal beside its opening joke. A feeling once described as a disease now names a school virtue and a NASA rover. The change does not remove curiosity’s capacity to harm. It changes which harms a culture is willing to accept in exchange for discovery.

The information gap

The first modern theory in the episode comes from George Loewenstein in the 1990s. Earlier accounts treat curiosity as the pleasure of learning. Loewenstein describes a more specific state: a person notices a gap between what they know and what they have just realised they do not know. The new awareness gives the gap a location.

Fry compares it to a missing tooth. A person who knows nothing about sixteenth-century French poetry has no particular itch to learn more. Someone who sees that a precise piece of information belongs in an already familiar pattern can feel its absence. The tongue keeps returning to the empty place. Curiosity therefore feels like deprivation. It has the force of a need even when the missing answer offers no material reward.

Brain scans, as Fry reports them, show the reward circuit becoming active when people enter this state of deprivation. The same circuit appears in situations involving gambling, food, or an anticipated message from a romantic interest. Michael Stevens draws a line between wanting and liking. Dopamine marks motivation and pursuit, while satisfaction belongs to another system. Fry illustrates the difference with Parkinson’s patients who receive drugs that raise dopamine. Some develop compulsive gambling, shopping, or eating. They keep pursuing the activity without enjoying it or reaching a point of satiety.

Curiosity also prepares memory. Once a person cares about the missing answer, the hippocampus becomes ready to retain what fills the gap. The effect has a shape. Someone who knows nothing about a subject has no place for the answer to attach. Someone who knows everything has no gap left. Curiosity reaches its highest point when a person knows enough to identify the missing piece and still believes it can be found.

That middle range explains clickbait. “You’ll enjoy this” leaves the gap too vague. “You will never believe what happened next” points towards an unfinished event, and “number one is mind-blowing” places a particular answer behind a promise. The headline opens a gap that feels small enough to fill. A person clicks because leaving it open feels harder than finding out.

A lesson in leaving the gap open

Fry demonstrates the mechanism with the seven dwarfs. She names Doc, Grumpy, Happy, Sleepy, and Sneezy, then asks Stevens for the other two. He knows that Bashful is one of them. The remaining name escapes him, which makes the envelope more compelling because Fry has written the answers inside it.

She gives three conditions for making someone curious and helping them remember the answer. The first opens a gap in which the person nearly knows the answer. The second leaves it open for a while instead of supplying immediate gratification. The third allows wrong guesses. An error makes the shape of the gap clearer, which gives the eventual answer somewhere to settle.

The teaching example is the stomach. A statement that the stomach lining regenerates in three days carries little force by itself. A question about stomach acid being strong enough to melt metal creates a sharper problem: why does the body avoid melting from the inside? Once people have proposed wrong answers, the fact about the lining supplies a satisfying resolution. The source presents the memory effect as Loewenstein’s finding rather than as a settled rule for every lesson.

Fry then recalls a 1992 study in which Loewenstein asked people which US state reaches furthest east. Stevens answers Maine because it lies close to Africa on a conventional map. The answer is Alaska. Parts of Alaska extend across the 180-degree meridian, so the state reaches further east in the system of longitude used here. Being told that Maine is wrong makes Stevens more curious and helps him retain the answer. A confident correct guess would have closed the gap before he had felt its shape.

The episode connects this result to a science educator’s doctoral research and street interviews. The captions render his name unclearly. People enjoy easy questions, yet they remember more when a video shows wrong guesses before giving the answer. The frustration keeps the problem active long enough for the hippocampus to treat the solution as worth retaining. The difficulty has to remain within reach. A gap that feels impossible produces indifference, whilst a gap that closes at once leaves little trace.

An experiment with 11-month-old babies makes the same point without language. Researchers show a ball passing through a wall by means of a hidden lever, then let the babies handle it alongside ordinary balls. The babies choose the surprising ball and test it against tables, walls, and chairs. When the trick changes so that the ball floats, they pick it up and drop it. Their actions resemble experiments on a physical model: they find the place where what they saw conflicts with what they expected, then probe the object to repair the model.

The babies lose interest when the event becomes too chaotic to understand or too simple to explain. Curiosity needs a gap with a recognisable shape and a plausible route towards an answer. Stevens is still trying to name the seventh dwarf in the background. The withheld answer has become a task he wants to finish for its own sake.

Who keeps looking, and why

The speakers ask whether people differ in how much an open question bothers them. Fry says that curiosity can decline with age as the dopamine system that motivates discovery weakens in some people. She does not give a measure for that claim, so it remains part of the episode’s account of individual variation.

The evolutionary question returns through other animals. In one experiment, two levers give the same fifty percent chance of food after five seconds. One lever also tells the animal immediately whether food is coming. Humans choose the information, as do macaques and birds. Goldfish show little interest in the extra signal. The result separates information from the reward itself. Some animals treat knowledge about an outcome as a reward with value of its own.

That value can produce useful risk. Augustine describes people gathering around a mangled corpse to look at it and become sad. Fry calls this morbid curiosity, then gives a more functional example. Some guppies leave the safety of their shoal to inspect a predator. They approach its tail rather than its mouth, and the inspection makes the predator lose its element of surprise. The predator sometimes abandons the hunt, which reduces the risk for the inspecting fish and the rest of the shoal.

The same logic appears in human interest in horror and true crime. Fry says that, during the early weeks of the 2020 pandemic, people with high scores for morbid curiosity showed greater psychological resilience and less distress. The episode treats frightening material as a form of rehearsal. Looking at danger from a safe distance can provide information that helps a person recognise or prepare for it. The study and its measurements receive no source details in the video, so the result remains a claim attributed to Fry.

The feed as an endless information gap

Curiosity becomes vulnerable when a system can manufacture gaps faster than a person can close them. The episode uses a 2018 OpenAI experiment to make the point. Agents rewarded only for curiosity learn to play Mario and explore their environment. When the researchers add a television showing random static, the agents stop moving. The static offers maximal unpredictability, so the agents become fixed on the most curious stimulus available.

Human beings need a gap with the right size and shape. Doomscrolling gets close enough by promising that the next item may answer a question or open another one. Each swipe asks what the next video will show. Clickbait improves the system’s hold by presenting a gap in a form that encourages a longer watch. The episode argues that the attention economy therefore builds an exploitation of curiosity into an algorithmic system that already measures how long people stay.

Each person’s feed finds a different way to do this. One person receives outrage, another receives puzzles, and another receives something else that keeps the relevant gap open. Stevens describes seeing a short puzzle that asks viewers to name the seven dwarfs. He may think about it for a second, screenshot it, and promise to return later before continuing to scroll. The answer never has time to become a proper problem. A stream of one- or two-minute videos resolves each gap almost as soon as it opens, so the hippocampus has little time to retain what the person saw.

Fry then extends the food comparison. Curiosity needs hunger, which means it needs some deprivation. Constant short-form content acts like snacking: it gives the reward system small amounts of novelty whilst preventing the deeper hunger that might send someone towards a difficult question. She says that evidence is mounting that the attention economy can dampen curiosity over time. The claim goes beyond the episode’s directly described experiments, so it belongs to Fry’s interpretation of the research.

Easy access to information and AI assistance can reduce that hunger further. A person who can ask a system to solve a logistical problem receives an answer before the problem has developed into a sustained question. The episode does not treat assistance as harmful in every case. It says that an unanswered problem can provide the pressure that makes someone seek a deeper answer, and that a life of constant small resolutions can leave little appetite for that work.

The rover named Curiosity

The episode ends with a public naming competition for a Mars rover that NASA ran in 2009. A sixth-grade student from Lenexa, Kansas, Clara Ma, proposes “Curiosity” and writes a 250-word essay about an everlasting flame in the mind that drives people through ordinary days. NASA accepts the name, and Ma gets to sign it on the rover.

The story brings the episode back to its opening history. Curiosity has been called a disease, punished in myths, and shown to overrule fear of an electric shock. It also sends a machine across space, attached to a nuclear battery and named by a child who describes the impulse in terms that the adults recognise. The name carries the whole change in status and leaves curiosity’s capacity to harm intact.

Limits

The captions and description identify the episode as a conversation between Hannah Fry and Michael Stevens. The scientific claims about the shock-pen experiment, dopamine, Parkinson’s medication, hippocampal memory, wrong answers, infant learning, ageing, animal information-seeking, morbid curiosity, and the OpenAI agents remain claims made in that conversation. The video gives few study titles, methods, or links, so the note keeps its reported findings attached to the speakers.

The source describes the Academy of Secrets, the Inquisition, Augustine, Aquinas, the history of “care killed the cat”, George Loewenstein’s work, a science educator’s teaching, and NASA’s naming competition without supplying a bibliography. The dates and names in the captions also contain transcription errors, including the date of the historical reversal and the spelling of Lenexa. The episode’s link points to Cancer Research UK and belongs to its sponsorship, which has been omitted along with the production credits and outro.

Further reading / references

• George Loewenstein’s work on curiosity and information gaps, including the 1992 study and the 1990s theory discussed in the episode. The video gives no paper title or link.
• The science educator’s doctoral research and street-interview teaching examples, mentioned in the episode without a clear name or link in the captions.
• NASA’s 2009 public naming competition for the Mars rover Curiosity, described in the episode without a linked source.