A week of vacation in an unfamiliar place can feel longer than a whole month spent at the office once you’re back home. This isn’t a nostalgic illusion: researchers have just pinpointed the precise mechanism that explains why childhood summers stretch out in memory far more than an entire adult year. The key lies in one word: novelty. The brain does not record time like a clock ticking; it reconstructs it afterward from the number of new things it had to process.
Key takeaways
- The brain counts events, not hours — which explains the illusion of time stretching
- An MRI study of 557 people shows younger brains change state much more often than older brains
- Good news: breaking routine at any age suffices to recover that sensation of thickened time
The brain counts events, not hours
Neurologist Marc Wittmann, from the Institute for the Frontiers of Psychology in Freiburg, describes a simple mechanism: time is processed by the brain according to the amount of “new” information it records, with novelty acting as a mental timestamp where the freshest experiences make a day feel longer when recalled later. Each time the brain encounters something it has never processed before, a spike of attention marks the event as worth preserving. The more of these markers there are, the thicker the mental log becomes, and the period in question will seem longer in hindsight.
That is exactly what happens during a ten-year summer. Children fill their days with firsts: a first swim in the pool, a first attempt at long division, a first night away from home. By contrast, adult life often unfolds in loops: subway rides, emails, the same routes, the same gestures, and in the end memory compresses. The result? An entire month of routine can shrink in memory to a handful of blurry images, while three weeks of camping with camp friends occupy dozens of distinct scenes.
An MRI study confirms the phenomenon in 557 people
An international team set out to test this intuition with brain-imaging tools. They studied 557 people aged 18 to 88 who watched an eight-minute video while their brain activity was scanned. The result is clear: older brains changed state less frequently and more slowly than younger ones. The study authors, published in Communications Biology, summarize the mechanism in one sentence: when the brain records fewer changes, it receives fewer “reference points,” memories become rarer, and segments of time begin to feel shorter when recalled.
This fragmentation of experience into distinct episodes is not trivial. A young brain segments reality into many micro-chapters; an older brain, faced with days that resemble each other, merges these chapters into a single long paragraph with little relief. A young brain records numerous micro-events that “stretch” time, while an older brain records fewer, which helps explain why adulthood feels swift and childhood seems endless. The explanation aligns with earlier work by Adrian Bejan of Duke University, who already pointed to a progressive neural-network diversification with age, slowing down information flow and reducing the number of mental images recorded.
Note: memory alone does not explain everything
Things get a bit more complex when looking at more recent work, published in Psychology Today by researchers at Sapienza University of Rome and Freiburg’s Institute for the Frontiers of Psychology. Testing 120 adults aged 20 to 91, this team set out to directly verify the memory hypothesis about the perception of the past decade. Surprise: no link was found between the feeling that the last ten years flew by and the number of autobiographical memories reported. Furthermore, with age, participants described their memories as more vivid and meaningful than younger adults. The decisive factor, according to these researchers, would be the gradual decline of certain cognitive abilities, which produces the sensation of time speeding up in the last decade.
These two lines of inquiry do not entirely contradict each other; they apply to different time scales. The density of novelty explains well why a ten-year summer seems endless compared with forty years of office life. But on the longer scale of a decade, processing speed, attention, and short-term memory—gradually declining—tip the balance. The two mechanisms coexist: one affects the thickness of the immediate memory, the other affects how we judge long periods in hindsight.
Breaking the routine to regain the thickness of time
The good news is that novelty remains within reach, even after fifty years. Changing your route to work, trying a cuisine you’ve never tasted, learning a few words of a foreign language: these aren’t vacations, but they are markers. Three simple directions frequently recur in research on the topic:
- Vary your routes and places visited, even over short distances
- Learn a concrete skill, an instrument, a language, a recipe
- Multiply meetings and unusual social activities
Introducing novelty into life when possible will bring memories to the surface and extend time in that sense: visit new places, meet new people, be spontaneous when you can. It isn’t about filling your calendar to the brim; a Sunday afternoon spent discovering a neighborhood you don’t know in your own city often yields more memorable moments than a week ruled by the same schedules. One final caveat should be kept in mind: this memory-dense effect mainly concerns short-term time—the season or a summer. On the scale of a lifetime, other biological clocks—cardiac, respiratory, hormonal—continue to slow down in the background, further complicating the equation of time that slips away.
Sources: anpere.fr | minty-wendy.com
