Popcorn brain

Popcorn brain describes a mind that has grown used to the speed of a screen. Messages, clips and alerts arrive one after another, each one a small pop. After enough hours of that, slower things start to feel dull: a book, a long conversation, a walk without headphones.

The phrase is credited to David Levy, a researcher at the University of Washington, and it reached the public in a 2011 report by CNN. The article’s point is that a person can get so used to doing several things on screens at once that ordinary life, which moves more slowly, becomes hard to sit through. In CNN’s words, popcorn brain is “a brain so accustomed to the constant stimulation of electronic multitasking that we’re unfit for life offline, where things pop at a much slower pace.”

In an ordinary day popcorn brain looks like this. You open a document and reach for the phone before the first paragraph is done. You watch a show with a second screen in your hand. You sit down to read and stand up again within minutes, without having decided to.

Popcorn brain is a figure of speech. Nothing in the head is popping, and no doctor uses the phrase as a medical term. Popcorn brain is a name for a pattern of behavior, and a pattern of behavior is something a person can watch and change.

Popcorn brain is credited to David Levy, a professor at the Information School of the University of Washington. The term reached the public on CNN in June 2011, in an article by the network’s senior medical correspondent, Elizabeth Cohen, under the headline “Does life online give you ‘popcorn brain’?”

We looked for an earlier use and did not find one we could read. The CNN article says the worry is that life online is giving people what Levy “calls” popcorn brain. The word “calls” suggests he was already using the phrase in his talks. So the careful way to put it is that popcorn brain is Levy’s term, and that CNN first reported it widely that year.

Levy gave the reporter a story to show what he meant. After a speech at a technology company, an employee told him about the evening before. The man’s wife had asked him to give their young daughter a bath. He spent the bath time on his phone, sending texts and answering email, though no work was due. Nothing online needed him that evening, and he reached for the phone anyway.

The article also quoted Clifford Nass, a social psychologist at Stanford University who studied people who use several kinds of media at once. Nass worried that people who do many things online at once get too little practice at understanding what other people are feeling. A well-known experiment on multitasking from his lab is described in the section on attention spans further down this page.

Levy’s own advice in that article was modest, and it is still useful. Keep track of how much time you spend online and what you do with it, he said. “Everyone I’ve told to do this has come back with personal realizations.” He meant that people who kept track learned something about themselves. The rest of this page follows that advice.

TikTok brain is the nickname people now use for popcorn brain when the cause they have in mind is short video. TikTok brain is not a medical term either. The research on short videos is young, and one experiment shows both what that research can tell us and where it stops.

The experiment, by Chiossi and colleagues (2023), asked whether a short break on a phone changes how well people remember what they meant to do next. The researchers brought 60 adults into a lab, all fluent German speakers aged 19 to 34. Each person did a simple word task on a computer. While doing it, they also had to remember a plan: press a special key whenever one of three chosen words appeared. Psychologists call this prospective memory, the kind of memory you use when you remember to mail a letter on the way home.

Halfway through, everyone took a break of 10 minutes. The researchers split people into 4 groups. One group rested without a screen. One scrolled Twitter. One watched a single YouTube video. One scrolled TikTok. Then all of them went back to the task.

Only the TikTok group came back worse at carrying out the plan. Among its 15 members, the share of wrong responses on the remembering part rose from 20% before the break to 51% after it. The other three groups held steady. The plain word task was unaffected in every group, so people had not become slower or less able in general. They had forgotten what they meant to do.

The limits matter as much as the result. This was one session, with a small number of young adults, measured minutes after the break. The authors say more research is needed to explain the effect. A lasting change in anyone’s attention is not something this study measured.

There is a much larger set of studies of short videos, but it is of a kind that cannot show what causes what. A review by Nguyen and colleagues (2025) gathered 71 separate studies, added up their results, and found that people who use short videos more tend to do worse on attention tests. That is a link between two things, and a link cannot say which causes which. The page on brain rot goes through that review in detail.

Fix a short attention span by going longer between one look at your phone and the next, a little more each week. The six steps below start with two from David Levy, the researcher credited with the phrase popcorn brain. The other four come from the studies on this page.

1. Keep a record for a week. This is Levy’s first step. Note when you go online and what you do there. People who try it, he said, often find they reach for a screen when they are bored or uneasy.
2. Practice doing nothing for two minutes. Levy’s other suggestion was to look out of a window for 2 minutes. He told CNN it can help a person slow down a little. It costs nothing to try, and it shows you quickly how strong the urge to pick up the phone is.
3. Give the phone set times. Choose a few times a day for messages and feeds, as in the quiet gap counter on this page. Outside those times, do not pick up the phone.
4. Keep the phone in another room in between. In the experiment by Ward and colleagues (2017), where every phone was silenced, people did worse with the phone on the desk than with it in another room.
5. Silence the alerts. Stothart and colleagues (2015) found that a notification alone disrupted people who were doing a demanding task, even when they did not pick the phone up. We read the summary of that paper, which gives no figures.
6. Lengthen one stretch each week. Pick one activity, such as reading, and stay with it a few minutes longer than last week before the next phone time. The page on how to increase your attention span has a week-by-week plan for this.

Two related problems have their own pages. If the phone time is mostly bad news you cannot stop reading, see how to stop doomscrolling. If the problem is the total number of hours on your phone, see how to break phone addiction.

Feeling steadier is a weak test of popcorn brain, because a calm day and a restless day feel different for reasons that have nothing to do with your habits. A stretch of reading has a start time and an end time, so it can be measured.

A good way to run this test takes the start and the end from what you already write or say about your day: when you sat down with the book and when you picked up the phone. You should not have to remember a stopwatch. Most journaling apps record how the day felt and nothing more. They keep a note that you felt restless, which matters, but they do not count the minutes that would show whether that is changing.

One app built for this is Think in Numbers, a smart journaling app with time tracking built in.

You write or say your day in your own words, as it happens or all at once. The app reads what you wrote and counts the hours that went to each part of it: your reading or focused work, the longest stretch of it, your phone, and the time you never mentioned (shown as unaccounted). Then it shows those hours over days and weeks. A weekly view puts this week’s hours next to last week’s.

Write my first day

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The example person on this page, a made-up designer who wanted to read after dinner, shows the test in practice. In week one this person opened a book on 2 evenings, and neither try at reading lasted longer than 10m.

By week three the book was open on 6 evenings, and the longest stretch had grown to 40m. The one evening without reading came after a bad day at work, and this person read again the next evening.

Every figure on this page links to one of these sources. We read the CNN article, the short-video experiment, the BBC report, the interview with Gloria Mark and the two phone and multitasking papers in full. For the review of short-video studies and the notification study we read the published summaries.

1. CNN (archived by the Internet Archive) (read October 6, 2026). Does life online give you ‘popcorn brain’?
2. Chiossi, F., Haliburton, L., Ou, C., Butz, A. and Schmidt, A. (2023). Short-form videos degrade our capacity to retain intentions: Effect of context switching on prospective memory. Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (CHI ’23), article 30.
3. Nguyen, L., Walters, J., Paul, S., Monreal Ijurco, S., Rainey, G. E., Parekh, N., Blair, G. and Darrah, M. (2025). Feeds, feelings, and focus: A systematic review and meta-analysis examining the cognitive and mental health correlates of short-form video use. Psychological Bulletin, 151(9), 1125-1146.
4. BBC News (BBC World Service, More or Less) (read October 4, 2026). Busting the attention span myth.
5. University of California (read October 4, 2026). Can’t pay attention? You’re not alone.
6. Ward, A. F., Duke, K., Gneezy, A. and Bos, M. W. (2017). Brain drain: the mere presence of one’s own smartphone reduces available cognitive capacity. Journal of the Association for Consumer Research, 2(2), 140-154.
7. Ophir, E., Nass, C. and Wagner, A. D. (2009). Cognitive control in media multitaskers. Proceedings of the National Academy of Sciences, 106(37), 15583-15587.
8. Stothart, C., Mitchum, A. and Yehnert, C. (2015). The attentional cost of receiving a cell phone notification. Journal of Experimental Psychology: Human Perception and Performance, 41(4), 893-897.

This page reports what a news article and researchers have said about a popular phrase. It is not medical advice.