How Animals Experience Time: The Science of Timescapes

Try swatting a fly and it may disappear before your hand reaches it, making even your quickest movement seem barely fast at all.

We often explain encounters like this with a straightforward idea: some animals operate on a faster clock than humans, taking in more snapshots of their surroundings every second.

But that neat explanation may conceal something more unusual. The difference between a fly’s world and ours might have less to do with speed than with the way each creature joins raw sensations into a developing moment.

An animal’s perception of time

For decades, scientists studying how animals sense time relied on a single measure: the speed at which a flickering light’s flashes merge into a continuous glow.

That threshold became the standard yardstick for comparing animal time perception.

A new paper argues that the flicker measure captures only a narrow aspect of visual processing. Its authors say the field’s reliance on it has quietly led researchers astray for years.

Ishan Singhal, a postdoctoral fellow at the University of Sussex, and his colleagues put forward a broader approach.

They call it an animal’s timescape: the way a creature’s perceptions are joined together and refreshed as the world moves.

Five moving windows into animal timescapes

Singhal’s team divides the timescape into five measurable components, each representing a window that can be tested in a laboratory.

The first follows how a creature combines separate sights and sounds into one moment. The second measures how rapidly new input replaces what came a heartbeat earlier.

A third concerns how long attention remains fixed on something. A fourth measures how long an image persists after the thing itself has disappeared.

The final window tracks how long a perception lasts before the brain exchanges it for the next one.

The duration of each window varies enormously between species, and that variation is central to the idea. It suggests that animals do more than see faster or slower: they organise the raw stream of experience into genuinely different patterns.

Filling the gaps

A clever experiment with sound brings one of these windows to life. Researchers played squirrels and starlings recordings of calls made by their own species, inserting bursts of static into the middle of the calls.

The animals responded as though the static had never interrupted them, answering as if each call had played without interference.

Something about their hearing appears to bridge the interruption, much as you can still make out a word when a cough cuts across it. That filling-in worked only up to a certain point, however.

When the static was extended beyond a particular length, the effect disappeared.

That limit was reached much sooner in birds and squirrels than in people, telling researchers exactly how long a perception remains editable before it becomes fixed.

Tricks of timing

Visual illusions offer some of the sharpest tools for investigating these differences. Show someone a flash beside a moving object and the flash appears to lag behind, even though both occupy the same position.

Other animals are susceptible to the same illusion, but for them the phantom flash appears in a different place.

Then there is the peacock. When a male spreads his feathers and shivers them during a display, the shimmering eyespots appear to float ahead of the rest of his train, suspended apart from the feathers carrying them.

This illusion of depth is created by timing alone.

Mice and humans even differ over whether a sequence of still images looks like smooth motion. The field once lacked a common language for differences such as these, but a review of the old flicker measure has highlighted how easily a single figure can be misleading.

Why one number fails

Before this paper, the field had no organised framework for examining these questions alongside one another.

The old threshold could show that a beetle registers up to roughly 500 flashes per second, while a human sees steady light beyond about 60. But that was where it stopped.

The result was an odd situation: researchers could rank animals on one scale of visual speed, and go no further.

The deeper differences beneath that ranking had no name. Speed by itself never explained how a creature assembled its world.

The timescape divides that single blurry figure into five sharper measures. Each can be tested through its own experiment and compared across species to map how experience is organised in time.

How animals experience time

The potential benefits extend well beyond the laboratory.

Understanding how a bird perceives fast movement could affect where wind turbines are placed: the edges of spinning blades may blur until they are almost invisible to some species, leading to fatal collisions.

The same reasoning applies wherever animals share space with human machinery. A creature’s window of attention or persistence determines what it can avoid or pursue, yet designers have rarely had access to data of this kind.

For the first time, researchers have a method for measuring and comparing how different animals experience time.

Scientists can now map the world a starling inhabits, second by second.