Your brain on boredom

There is a network of regions in the human brain that switches on when nothing else is going on. Not when you are sleeping. Not when you are meditating. Not even when you are "relaxing" with a podcast. It comes online when you are, in the specific and increasingly rare sense of the word, bored.

It is called the Default Mode Network, and for twenty years it has been quietly rewriting the way neuroscientists think about what the brain does with its downtime.

The network that runs on nothing

In the late 1990s, a neurologist at Washington University named Marcus Raichle noticed something peculiar in positron emission tomography scans. When subjects were given no particular task — when they were simply resting in the scanner, eyes open, not thinking about anything in particular — their brains did not go quiet. A specific and reproducible set of regions became more active, not less. The medial prefrontal cortex. The posterior cingulate cortex. The angular gyrus. Parts of the medial temporal lobe.

These regions formed a coherent network. They were consistently more active during rest and consistently deactivated during goal-directed tasks. Raichle named it the Default Mode Network, on the grounds that it appeared to be what the brain defaulted to when nothing else was being asked of it (Raichle et al., 2001).

The finding was initially regarded with some suspicion. Network activity during rest sounded suspiciously like noise — an artefact of scanner baselines, perhaps, or a statistical mirage. Over the following two decades it turned out to be neither. The DMN is now one of the most studied large-scale networks in cognitive neuroscience, and it is not idle chatter. It is doing some of the brain's most important work.

What the Default Mode Network actually does

The DMN is active whenever attention is directed inward rather than outward — when the brain is engaged in what researchers call self-referential processing. Stated like that it sounds narcissistic. It is not. It is the neural substrate of some of the most essential cognitive functions a human being has.

Autobiographical memory. The DMN is heavily involved in the retrieval and consolidation of personal memories. When an unbidden memory from eight years ago surfaces while you are staring out a train window, that is the DMN doing the retrieving (Buckner, Andrews-Hanna, and Schacter, 2008).

Future simulation. The same network that replays the past also rehearses the future. It uses lived experience as raw material for imagining what might happen, a process researchers call prospection. The overlap between memory and imagination is not coincidental; they use much of the same neural machinery (Buckner and Carroll, 2007; Schacter, Addis, and Buckner, 2007).

Social cognition. Understanding what another person is thinking — their intentions, motivations, emotional state — relies on the DMN. It is the neural basis of what psychologists call theory of mind, and its dysfunction has been implicated in conditions from autism to schizophrenia (Mars et al., 2012; Li, Mai, and Liu, 2014).

Creative incubation. In a now-frequently-cited study, Baird and colleagues (2012) found that participants performed significantly better on the Unusual Uses Task — a standard creativity measure — after a period of mind-wandering than after a rest period, a demanding task, or no break at all. The mechanism they proposed is that unfocused thought allows ideas from different cognitive domains to collide in ways that focused attention prevents.

Consolidation of identity. Mary Helen Immordino-Yang and her colleagues at USC have argued, in a series of papers beginning in 2012, that the DMN is the network in which adolescents construct a stable sense of self and moral identity. "Rest is not idleness," they write. "It is during rest that we consolidate our experiences into our sense of self" (Immordino-Yang, Christodoulou, and Singh, 2012).

Collectively, the picture is that the DMN is doing some of the brain's most expensive and least substitutable work. It is how the brain knits the rest of its activity into a coherent life.

The problem

The problem is that the conditions under which the DMN naturally comes online — moments of undirected, unstimulated attention — have been engineered out of modern daily life.

The phone is the most obvious vector. Every moment that was once empty — the queue, the bus stop, the waiting room, the walk to the shop — is now filled. Estimates vary, but several recent studies put daily smartphone interactions in the range of 80 to 150 a day for the average adult, which works out to once every six to ten minutes of waking life (Andrews et al., 2015; Wilmer, Sherman, and Chein, 2017). A decade of further research has only pushed those numbers higher.

This is not merely a matter of time. It is a matter of what the time would otherwise have been for. If the DMN is the brain's consolidation and creative-incubation system, and if it only runs when attention is not being held elsewhere, then every instance of pocket-reach-and-scroll is a small interruption of something the brain was trying to do. Over thousands of such interruptions a week, the cost is not obviously zero.

There is some direct evidence that it is not. Mark Williams and colleagues at Oxford have documented associations between heavy smartphone use and reduced resting-state connectivity in DMN-adjacent regions, though the causal direction remains open. Sandi Mann at the University of Central Lancashire has shown experimentally that people who are allowed to be bored before a creative task outperform those who are not, a finding she interprets as evidence that boredom is not a bug but a signal: the brain, starved of external input, begins manufacturing its own (Mann and Cadman, 2014).

What boredom actually is

Let us be accurate about what is being discussed. Boredom is not a pleasant state. It is an aversive one — unpleasant by design. The standard evolutionary account is that it is a motivator: a bored organism seeks novelty, which in ancestral environments usually meant seeking food, status, or opportunities. Boredom evolved as a signal to go find something.

The difficulty is that in an environment saturated with cheap stimulation, the easiest thing to "find" is a scroll. The phone offers instant, near-effortless relief from the aversive feeling. Variable reward schedules — a concept borrowed from operant conditioning and applied, with considerable sophistication, by the designers of modern social feeds — keep the relief available on demand. The boredom evaporates. What the boredom would have unlocked evaporates with it.

This is the loss that is difficult to notice, because it happens in a counterfactual. You do not experience the creative insight you would have had on the train if you had not opened the phone. You experience only the phone.

The first ten minutes

There is an old observation in the meditation and contemplative traditions — predating the neuroscience by several thousand years — that the first ten minutes of deliberate inactivity are the worst. The mind races. The hand reaches. The body fidgets. Anyone who has tried to sit still without a stimulus knows the feeling. It is uncomfortable, and it is, mechanically, a form of withdrawal from continuous input.

It also passes. This is the recurring finding, in the research and in ordinary experience: the acute discomfort of boredom is transient. After a handful of minutes it begins to settle. The racing thought slows. The restlessness gives way to something more spacious. Ideas surface. Memories surface. Sensory detail becomes available again — the sound of traffic, the texture of the bench, the colour of the sky.

That shift is the DMN coming online. That is what it feels like.

Practical boredom

Nothing in the research requires dramatic changes to get most of the benefit. It does not require meditation, or a retreat, or an app. It requires only that you permit yourself the occasional unfilled moment.

• Commute in silence once a week. No podcast, no playlist. Just the window and the noise of the vehicle.
• Wait without reaching. Queue, lift, waiting room. Leave the phone in the bag. Stand there. It will feel strange for the first minute.
• Sit somewhere for ten minutes. A bench, a step, a café. Nothing to read. Nothing to watch. Ten minutes.
• Walk without headphones. One walk a week, unaccompanied by voice or music. Listen to the neighbourhood instead.

None of these require willpower in the exhausting sense. They require only a short period of tolerated discomfort. What follows the discomfort is the thing worth the exercise.

The quiet conclusion

The neuroscience is not decisive on every point, and anyone who tells you otherwise is selling something. But the broad shape of the findings is robust enough to take seriously. The brain needs downtime. The downtime is not cosmetic. It is the condition under which a substantial portion of memory consolidation, creative insight, emotional processing, and self-understanding actually occurs.

The deeper point is smaller than that and also larger. In the silence, what tends to come back is your own thinking, rather than whatever the most recent feed was feeding you. You remember what you cared about before someone told you what to care about. You have ideas that are genuinely, unmistakably yours.

That is worth ten minutes of discomfort a day.

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References

• Andrews, S., Ellis, D. A., Shaw, H., & Piwek, L. (2015). Beyond self-report: tools to compare estimated and real-world smartphone use. PLoS ONE, 10(10), e0139004.
• Baird, B., Smallwood, J., Mrazek, M. D., Kam, J. W. Y., Franklin, M. S., & Schooler, J. W. (2012). Inspired by distraction: mind wandering facilitates creative incubation. Psychological Science, 23(10), 1117–1122.
• Buckner, R. L., & Carroll, D. C. (2007). Self-projection and the brain. Trends in Cognitive Sciences, 11(2), 49–57.
• Buckner, R. L., Andrews-Hanna, J. R., & Schacter, D. L. (2008). The brain's default network: anatomy, function, and relevance to disease. Annals of the New York Academy of Sciences, 1124(1), 1–38.
• Immordino-Yang, M. H., Christodoulou, J. A., & Singh, V. (2012). Rest is not idleness: implications of the brain's default mode for human development and education. Perspectives on Psychological Science, 7(4), 352–364.
• Li, W., Mai, X., & Liu, C. (2014). The default mode network and social understanding of others: what do brain connectivity studies tell us? Frontiers in Human Neuroscience, 8, 74.
• Mann, S., & Cadman, R. (2014). Does being bored make us more creative? Creativity Research Journal, 26(2), 165–173.
• Mars, R. B., Neubert, F. X., Noonan, M. P., Sallet, J., Toni, I., & Rushworth, M. F. S. (2012). On the relationship between the "default mode network" and the "social brain." Frontiers in Human Neuroscience, 6, 189.
• Raichle, M. E., MacLeod, A. M., Snyder, A. Z., Powers, W. J., Gusnard, D. A., & Shulman, G. L. (2001). A default mode of brain function. Proceedings of the National Academy of Sciences, 98(2), 676–682.
• Schacter, D. L., Addis, D. R., & Buckner, R. L. (2007). Remembering the past to imagine the future: the prospective brain. Nature Reviews Neuroscience, 8(9), 657–661.
• Wilmer, H. H., Sherman, L. E., & Chein, J. M. (2017). Smartphones and cognition: a review of research exploring the links between mobile technology habits and cognitive functioning. Frontiers in Psychology, 8, 605.