October 26, 2026

Harvard Set People's Phones Buzzing at Random. Nearly Half the Time, Their Minds Were Somewhere Else

mindfulnessmind-wanderingoverthinkingmeditation

You read a whole page of a book, and you can't remember a thing. Your eyes followed the words, but your mind was somewhere else.

In 2010, a Harvard research team set out to catch that moment on purpose. They built an iPhone app that buzzed people at random times: while walking, eating, working. About 5,000 people sent nearly 250,000 answers, and the researchers analyzed the answers of 2,250 of those adults.

This post includes one small move you can make when your mind has drifted like that.

A faceless person sits reading an open book while a small grey cloud with one orange paper patch floats outside the book, away from the reader, in a paper collage

Nearly half of your waking hours go to thoughts about something other than what you're doing

People spend nearly half of their waking hours thinking about something other than what they're doing. In a 2010 study in Science by Matthew Killingsworth and Daniel Gilbert at Harvard, 46.9% of the moments sampled from 2,250 adults were moments when their minds were elsewhere. Killingsworth & Gilbert, Science, 2010.

The method was simple. Phones buzzed at random moments during the day and asked three things. How do you feel right now? What are you doing right now? And are you thinking about something other than what you're doing? People rated their mood on a slider from 0 (very bad) to 100 (very good) and picked their activity from 22 options.

Changing the activity barely changed the wandering. In every one of the 22 activities except sex, at least 30% of the answers were "yes, my mind was elsewhere." The paper notes this is considerably higher than the rates typically seen in lab experiments.

But what the researchers really wanted to know wasn't how often. It was how people felt in those moments.

Whatever people were doing, they felt worse when their minds were somewhere else

In the 2010 Harvard study, people were less happy when their minds were wandering than when they weren't, and this held across every activity, including the least enjoyable ones. The same activity felt different depending on whether the mind was on it.

What predicted mood better wasn't what people were doing but where their minds were. Of the ups and downs in a person's mood across the day, what they were doing accounted for 4.6%, and whether their mind was wandering accounted for 10.8%.

Mood tracked where people's minds were more than what they were doing.

So what if the wandering thought is a pleasant one?

Even pleasant wandering thoughts didn't leave people happier than staying focused

In the 2010 Harvard study, when the wandering thought was pleasant, people were about as happy as when they were focused on what they were doing. They were not happier for it. When the thought was neutral, mood was clearly lower, and when it was unpleasant, much lower.

The study also asked where minds went. In 42.5% of the wandering moments the thought was pleasant, in 31% neutral, and in 26.5% unpleasant. Pleasant thoughts were the most common, but they never lifted mood above what focus did.

One question is left. Do people wander because they feel bad?

Does a low mood cause the wandering, or does the wandering lower the mood?

The 2010 Harvard study's timing analysis suggested that mind-wandering was generally a cause, and not merely a consequence, of low mood, though it did not prove it. It's already known that feeling bad leads minds to wander, so the study's researchers analyzed the order of events. The wandering came first, and the dip in mood came after.

The limits matter too. Participants were volunteers who chose to use an iPhone app, and 73.9% lived in the United States. Mood was a momentary self-report. The study tracked the order of events rather than experimentally adding or removing wandering. So it's hard to say the same holds for everyone.

Still, the picture it gave is clear. Mind-wandering is extremely common, and moments of wandering came with lower mood.

Mind-wandering isn't something to stop. It's something to notice

Because the 2010 Harvard study found minds wandering nearly half the time, noticing that your mind has wandered comes before trying to stop it. When thoughts keep coming, it's tempting to force them to stop. But wandering isn't a malfunction to fix. It's something that happens all the time.

The real problem is that while your mind is wandering, you don't know it's wandering.

You only realize when someone talks to you, or you get stuck on what you were doing and snap back. In this experiment, the buzz was that signal. The moment it buzzed and asked, people looked at where their thoughts had been.

But in daily life, nobody buzzes you like that.

So could you prompt yourself?

Noticing your own wandering, again and again, is the heart of mindfulness meditation

Practicing noticing when your mind has wandered is the heart of mindfulness meditation. You breathe, notice that your mind has gone somewhere, and come back to the breath, again and again. The 2010 Harvard study did not test meditation. But mindfulness meditation is exactly this: practicing noticing, and coming back, again and again.

What you do is simple. Close your eyes and keep your attention on the feeling of breathing. Soon another thought appears, and before long you're following it. Then you notice, "oh, my mind wandered," and you come back to the breath. Noticing and coming back is the whole practice. A thought showing up isn't something to fight. It's one more chance to notice.

You don't need a cushion, a quiet room, or a long stretch of time. A wandering mind isn't a failure. The moment you notice is one repetition of the practice.

I'm the developer of True Meditation, the app on this site. On your own, it's easy to notice a wandering mind only long after the fact, so I built it to tell you in that moment. With your eyes closed, you count silently, one number per breath, and tap the screen twice for each number. When your mind wanders, the tapping rhythm falls apart, and the app notices and tells you with a small vibration.

If your mind drifted off for a moment while reading this, and then came back, that was noticing.

In short

A wandering mind is common: in the 2010 Harvard study, 46.9% of the sampled moments from 2,250 adults were moments when their minds were elsewhere. In those moments people felt worse whatever they were doing, and even pleasant wandering didn't lift mood above focus. Because the results come from volunteers using an iPhone app and from momentary self-reports, it's hard to say they hold for everyone. What's needed first isn't stopping thoughts but noticing that your mind is somewhere else, and mindfulness meditation (breathing, noticing the wandering, and coming back to the breath) is the practice for that.

True Meditation isn't an app you listen to. It's an app for doing mindfulness meditation yourself — practice in noticing your own thoughts, built into an app. It's free on the App Store and Google Play.