Last Updated on May 23, 2026 by admin
Your cat is staring at you across the room. Her eyes narrow into soft crescents. They close, halfway, then all the way, then open again. It looks like she’s about to fall asleep.
She isn’t. She’s talking to you.
Most owners read the slow blink as drowsiness, or as the cat tuning them out. Some assume it’s affection but they don’t quite know why. Almost nobody realises it is a directed, voluntary signal — one that researchers have now mapped in two separate published studies, and one that you can answer back in real time.
What is actually happening
In 2020, a research team at the University of Sussex and the University of Portsmouth published the first peer-reviewed analysis of cat eye-narrowing movements in cat–human communication. The paper appeared in Scientific Reports, a Nature journal. The team was led by Dr Tasmin Humphrey, with Professor Karen McComb, both animal behaviour scientists. You can read the original paper here.
They ran two experiments. In the first, owners slow-blinked at their own cats in a quiet room. The cats slow-blinked back significantly more often than they did during a baseline period when no one interacted with them.
In the second experiment, a stranger walked in and slow-blinked at the same cats. After the slow blink, the cats were measurably more likely to approach the stranger’s outstretched hand than when the stranger had kept a neutral face.
Translation: the slow blink is not just affection your cat aims at you. It is an opener. It works on cats who do not know you yet, too.
The shelter study almost nobody knows about
A second study, published the next month in the journal Animals, took the same question into a shelter at the National Cat Adoption Centre in Sussex. Researchers spent ten days, from late June through mid-July of 2017, watching what happened when humans slow-blinked at adoptable cats.
The result, reported in the open-access paper on PMC, was uncomfortable for anyone who has ever walked past a quiet cat at a shelter without a second look. Cats that returned the slow blink with more, and longer, eye closures were rehomed faster than cats that did not. The cats who looked most anxious around people produced the longest slow-blink sequences in response — meaning the cats most desperate for a safe human were the ones working hardest to send the signal.
They were trying. Most people did not know to look.
Why your cat does this to you specifically
Cats slow-blink at humans they feel safe with. The narrowing of the eyes — what Professor McComb’s team described, in the University of Sussex announcement, as the closest thing cats have to a smile — is a low-threat signal. A predator with its eyes half-closed is a predator standing down. When your cat does it to you, she is telling you, in the only language she has, that she is not braced for anything to go wrong.
If you have ever had a cat who never quite seemed to relax around you, look for the half-closed eyes. They will appear before purring does. Sometimes years before.
How to slow-blink back
You do not need to hold a long stare. The Sussex team described the action in plain instructions: narrow your eyes at her the way you would in a relaxed smile, then close them all the way for a couple of seconds, then open. Do not lean in. Do not reach. Just blink.
She will, most of the time, blink back. Sometimes she will add a small head tilt. Some cats will get up and walk over to you. The first time it happens you will feel like you have cheated at a game whose rules nobody told you.
You have not. You have just learned to listen.
Does your cat slow-blink at you? Tell us her name in the comments 👇