The Body Clock: How We Experience the Passing of Time

"Lived time arises from our dynamic bodily self in the theatre of the present moment."

Updated October 2026

The passing of time is something your brain builds rather than reads off a single internal clock. It draws on changing signals from inside the body, such as heartbeat, breathing and arousal, along with attention, emotion and memory. Brain imaging studies consistently link time judgments to two regions: the insula and the supplementary motor area.

Why does time seem to speed by when we're having fun, yet slow to a crawl when we're bored or anxious? Why do the years go by faster as we age? Our subjective experience of time's passage is far more complex than any clock can convey. At the deepest level, we feel time through the interaction of body and brain.

Recent meta-analyses of neuroimaging data reveal that two key structures underlie the perception of time: the insular cortex and the supplementary motor area (SMA). Of these regions, the insula is particularly critical and acts as the main hub integrating interoceptive signals about the state of the body with other streams of sensory, cognitive, and emotional information.

This integrated data provides the raw materials for constructing our metacognitive sense of duration. In this dance between body and brain unfolds our flexible, relative experience of time in the moment.

What "the passing of time" means

Researchers separate two kinds of time experience: how long something lasted (a duration judgment) and how fast time seems to be moving right now (a passage-of-time judgment). In a small 2016 study of 27 adults, Droit-Volet and Wearden found the two were not significantly related. Happiness and absorption in an activity went with time feeling faster; sadness went with time feeling slower.

Is this the same as the circadian "body clock"?

Not quite. "Body clock" often means circadian rhythms, the roughly 24-hour cycles of sleep and hormones kept in step by a master clock in the brain, the suprachiasmatic nucleus. This article is about how we feel seconds and minutes going by.

The Brain's Role in Processing Time

To understand how we experience time, researchers have sought to pinpoint the brain areas most central for time perception and processing. Through studies of patients with brain lesions and functional MRI scans of activity during timing tasks, science has highlighted two consistent neural correlates.

One critical node is the insular cortex, or insula, a region deep within the brain that integrates visceral inputs from the body along with other sensory, memory, and emotional signals. PET scans show the insula remains active as we judge elapsed time in the seconds-to-minutes range.

Another key temporal processing center is the supplementary motor area (SMA), involved in planning and controlling volitional movement. The SMA monitors our unfolding sequence of motions and sensory input. It works closely with the insula to encode the raw "beats" of passing moments that underlie our capacity to judge duration.

The Body as Primal Timekeeper

But tracking these beats alone does not constitute the experience of time. Our perception of temporal flow relies profoundly on internal bodily sensations outside conscious control or awareness. These include our dynamic heartbeat, breathing rate, hunger signals, muscle tension, and hormonal cycles.

Together these form a kind of "body clock" that marks the passage of time and fuels temporal judgments. Think of how time seems to crawl when we're anxious, with our heart racing and muscles tense. Or how it speeds by when we're absorbed in pleasurable activities, as feel-good neurotransmitters enhance focus.

Emotions and arousal states bend our perception of time by altering interoceptive signals. Even body temperature and glucose levels modulate our temporal awareness. In essence, the body provides the embodied rhythms from which we abstract a sense of lived time.

Photo credit: Miguel Salgado @Unsplash

The Dance Between Body and Brain

Clearly time perception relies on interplay between bottom-up body signals and top-down cognitive processing. The insula acts as the key mediator, taking in "gut feelings" via its connections to the vagus nerve, which carries messages from the viscera.

This interoceptive data mingles with other sensory input, memories, and emotions within the insula. The integrated information gets synthesized with temporal calculations done by regions like the SMA. This combined output shapes our subjective feeling of time at any moment.

Focusing mindful attention on bodily sensations seems to expand experience of time by enhancing perception of this internal data stream. Disorders like depression that numb body awareness may alter individuals' time sense. Integrating signals from body and brain constructs a richer feeling of lived temporality.

Findings on the Insula's Role

The pivotal role of the insular cortex in time perception has gained increasing experimental support in recent years. For example, one study by Naghibi et al. analyzed the results of over 100 fMRI experiments. Across many different timing tasks, they found activation in the insula and SMA was reliably linked to processing time intervals in the range of seconds to minutes.

Other research directly tested the hypothesis proposed by neuroscientist Bud Craig in 2009 that the insula generates our metacognitive sense of time duration by integrating changing body state signals. For instance, an fMRI study by Wittmann et al. in 2010 found insula activity increased the longer participants estimated durations, supporting its accumulation of interoceptive information over time.

Studies by Teghil and colleagues provide further evidence by correlating insula function and bodily signal perception with accuracy on timing tasks. Individuals with more interoceptive sensibility showed enhanced insula connectivity and were better at reproducing durations without external cues.

What these studies did and did not show

Craig's 2009 paper is a theoretical model, not an experiment. It proposes that the anterior insula provides an internal time base for intervals of seconds and less, and says the mechanism is not yet described. In Wittmann's 2010 study, people heard tones of 9 or 18 seconds; posterior insula activity built up across each interval and peaked at its end. Naghibi and colleagues pooled 95 neuroimaging studies and found the pre-supplementary motor area and both insulae were the most consistently active regions. Teghil and colleagues found awareness of visceral sensations predicted timing accuracy only when intervals were marked by irregularly spaced stimuli.

This work suggests the insula is involved in timing and that body signals may contribute. It does not show that the insula alone creates our sense of time.

The Flexibility of Perceived Time

Given its reliance on changeable bodily factors like arousal and emotions, our sense of time passing exhibits huge flexibility. Our relative temporal experience bends and shifts dramatically based on our state.

Studies show major deviations in duration estimates depending on age, culture, heart rate, neural chemistry, music tempo, lighting, glucose levels, and emotional engagement. The malleability means we each inhabit streams of different inner rhythms and pulses generated by our unique biology.

While clocks strive to objectively measure uniform time, subjectively we experience flowing relativity, not constancy. Understanding the source of our temporal perceptions in body-brain interactions allows us to better accept these nonlinearities.

Why time seems to speed up or slow down

Emotion and arousal

A review by Droit-Volet and Meck describes how emotional arousal and the pleasantness of an experience interact to change perceived time, partly by shifting attention and the speed of an internal clock.

Age

In a survey of 499 people aged 14 to 94, Wittmann and Lehnhoff found age was linked to how fast time felt, but the effects were small, explaining at most 10% of the differences between people. Droit-Volet and Wearden found no age difference. The evidence is mixed.

Mood and depression

A 2015 meta-analysis of 16 studies found that people with depression felt time passing more slowly, yet judged actual durations about as accurately as others. If time has felt heavy and slow for weeks alongside low mood, it is worth talking with a doctor or therapist.

Conclusion: Embracing the Relativity of Time

By elucidating the role of interoceptive signals in shaping time consciousness, recent neuroscience reveals a more holistic perspective. Rather than seeing time as an abstract absolute, we recognize it as grounded in the somatic reality of our embodied existence.

Tuning into our own inner "body clock" can provide a felt sense of time's passage beyond clocks. Above all, this research highlights the value of fully inhabiting the present as we ride the ever-changing waves of neurological sensations that form the elusive substance called time.

Frequently asked questions

How do humans sense the passage of time without clocks?

We have no single sense organ for time. The brain appears to combine many signals, including changing body states, attention, emotion and memory, into a felt sense of duration. Imaging studies consistently link timing to the insula and the supplementary motor area. Daylight and daily routines help anchor longer rhythms.

Is the sense of time a real sense?

Not in the way vision or hearing is, since there is no dedicated receptor for time. Researchers often describe it as constructed from other information. Some, following Bud Craig, propose that interoception, our sense of the body's internal state, is a main ingredient. That idea has supporting evidence but is still being tested.

What part of the brain senses the passing of time?

No single area does it alone. A meta-analysis of 95 imaging studies found the pre-supplementary motor area and the insula on both sides of the brain were the most consistently active during timing tasks. Other regions, including the striatum and parts of the frontal and parietal cortex, take part depending on the task.

Written by the Somatopia team. Reviewed October 2026.

Photo credit: Jon Tyson @Unsplash