We help create time. In creating it, we create memory.
Deep within the brain's reward circuitry, UCLA researchers have found that dopamine does something far older and stranger than deliver pleasure — it stretches time itself. When 32 volunteers encountered novelty during a brain-scanning experiment, dopamine surged in the ventral tegmental area, causing them to perceive greater distance between moments than actually existed. This distortion, it turns out, is not a flaw but a feature: the brain uses it to carve continuous experience into distinct, retrievable episodes. Time, in this view, is not a river we float down but a landscape we quietly build as we go.
- A UCLA study reveals that dopamine surges not only at moments of reward but at any boundary where something new begins — upending the popular 'dopamine hit' narrative.
- Participants in an MRI experiment consistently misremembered the timing of images separated by a sensory change, perceiving those moments as farther apart than they truly were.
- A surprising detail sharpened the picture: people blinked more at event transitions, and those who blinked more remembered time as more expanded — a physiological signature written into the body itself.
- The COVID-19 lockdowns offer a haunting real-world echo: weeks of sameness collapsed in memory while chaotic early pandemic days feel stretched, suggesting dopamine-driven boundaries shape how entire life periods are retained.
- Researchers caution that brain scans cannot directly confirm dopamine as the cause, and laboratory conditions remain far simpler than the texture of lived experience — but the trajectory of inquiry is unmistakable.
Inside an MRI machine, volunteers watched neutral images flash at perfectly even intervals — but when a tone switched pitch or ear between images, something shifted in the brain. Deep in the ventral tegmental area, dopamine surged. And when participants were later asked how far apart those images had felt in time, they consistently placed the boundary-crossing moments farther apart than the others, even though the actual intervals were identical.
The UCLA team, led by doctoral student Erin Morrow and psychology professor David Clewett, published their findings in Nature Communications. What they uncovered challenges the popular reduction of dopamine to a pleasure chemical. Dopamine, they found, responds to novelty and change — and when it fires, it appears to stretch subjective time, helping the brain segment the continuous flow of experience into distinct, storable episodes. Clewett describes it as inserting small wedges into an otherwise unbroken stream, pushing neighboring events apart so they can be more clearly remembered and used.
A quieter detail in the data proved equally striking: participants blinked more often at event boundaries, and the more they blinked across a given window, the more expanded their time memory became. Blinking, linked in other research to dopamine signaling, appeared to function as a physiological marker of transition — the brain literally punctuating experience with a flutter of the eye.
The implications reach beyond the laboratory. During COVID-19 lockdowns, many people experienced a temporal paradox: days dragged while months disappeared. The researchers suggest this may reflect dopamine's role in memory construction. Monotonous stretches offered few novelty signals, few boundaries, few wedges — and so those periods collapsed into undifferentiated blur. The chaotic early weeks of the pandemic, by contrast, were rich with change and stress, both of which activate dopamine, leaving behind a memory that feels wide and full.
The study's authors are careful about its limits — brain imaging cannot prove causation, and simple tones are a long way from the complexity of real life. But the larger suggestion stands: we do not merely pass through time. We construct it, boundary by boundary, blink by blink, and in doing so, we construct the shape of what we remember.
You sit in an MRI machine watching neutral objects flash across a screen. Between each image, a tone plays in your ear—the same tone, the same ear, eight times in a row. Then it switches. The pitch changes. The ear changes. Your brain registers: something new is happening. And in that moment, deep in a region called the ventral tegmental area, dopamine surges.
This is what UCLA researchers discovered when they scanned the brains of 32 volunteers and asked them a deceptively simple question: how far apart in time did these images appear? The trick was that all the images were actually the same distance apart. Yet when people saw images separated by a tone switch—a boundary marking the end of one event and the start of another—they consistently remembered them as occurring farther apart in time than they actually were.
The finding upends a common misconception about dopamine. We hear "dopamine hit" and think of pleasure: the rush from good food, a social media scroll, a moment of joy. But dopamine does something else too, something more fundamental. It responds to novelty and change. When your brain detects that something new is beginning, dopamine floods in. And when it does, time stretches. The brain, it seems, uses this distortion to carve up the continuous stream of experience into distinct episodes that can be stored, retrieved, and flexibly reconstructed later.
Erin Morrow, the UCLA doctoral student who led the study published in Nature Communications, noticed something else in the data: people blinked more often when event boundaries occurred. Blinking, other research suggests, is linked to dopamine signaling. And sure enough, the more people blinked across a time window, the more they remembered those moments as being spread apart. The brain was literally marking transitions with a physiological signature—a blink—that correlated with expanded time memory.
David Clewett, the psychology professor overseeing the work, frames it this way: time is not a fixed dimension we move through. It's something the brain constructs, shapes by experience, and uses to understand change. "I think of it as inserting small wedges into an otherwise continuous stream," he said, "helping neighboring events stand apart." This matters because memory's purpose isn't perfect accuracy. It's utility. The brain remembers experiences in ways that help us learn and change our future behavior. A distorted sense of time—one that pushes distinct events farther apart in memory—serves that goal.
The implications ripple outward. During the COVID-19 lockdowns, many people reported a strange temporal paradox: the days felt slow and endless, yet months seemed to vanish from memory. The explanation may lie in dopamine and event boundaries. Long stretches of identical Zoom meetings, of sameness, offered few contextual changes. Without novelty, without dopamine surges marking transitions, those periods became compressed and indistinguishable in memory. By contrast, the early pandemic—chaotic, stressful, full of upheaval—pumped dopamine through the brain constantly. Stress, like novelty, activates the dopamine system. Those weeks feel expanded in memory because the brain had more information to work with, more boundaries to mark, more wedges to insert.
The study has limits. Brain scans cannot directly measure dopamine release or prove it causes time dilation. The laboratory setup—simple tones and neutral images—is far removed from the complexity of lived experience. More research will be needed to see whether these effects hold in the real world, where events are richer, messier, more emotionally laden. But the direction is clear. We do not simply move through time. We help create it. And in creating it, we create memory. In creating memory, we create the shape of our lives.
Notable Quotes
The purpose of memory is not always to reconstruct the past completely accurately. It helps us remember past experiences in the most useful way possible so that we can change our future behavior.— Erin Morrow, UCLA doctoral student
Time is something the brain constructs and is shaped by experience. Our sense of time is evolution's way of allowing us to understand change.— David Clewett, UCLA psychology professor
The Hearth Conversation Another angle on the story
So the brain is deliberately making time feel longer when something new happens. Why would it do that?
It's not about making things feel good. It's about organization. Imagine your brain as an archivist trying to sort a continuous stream of experience into folders. If everything felt like one long blur, you couldn't retrieve anything useful. By stretching time at boundaries—when something new starts—the brain creates separation. It says: this event ends here, that one begins there.
But the time distortion isn't accurate. People remember things as farther apart than they actually were. Isn't that a bug, not a feature?
That's the insight. It's not a bug. It's a feature. Memory doesn't need to be accurate about time. It needs to be useful. If you remember two events as more separated than they were, they're easier to distinguish later. You can learn from them independently instead of blurring them together.
The blinking thing is strange. Why would dopamine make you blink more?
We don't fully know yet. But the correlation is there. When dopamine surges at event boundaries, people blink more. And the more they blink, the more they remember time as expanded. It's like the brain is marking the moment with a physical stamp.
What about the lockdown example? Why did time feel slow but then disappear from memory?
Because lockdown was paradoxical. Stressful, yes—dopamine was active. But also repetitive. The same Zoom call, the same room, day after day. Without novelty, without new events to mark, those stretches became indistinguishable. Your brain had nothing to segment. So months of sameness compressed into almost nothing in memory.