Slow Blinking

The Science Behind It

A 2020 study published in Scientific Reports by researchers at the University of Sussex and the University of Portsmouth was the first to scientifically confirm what cat owners have long suspected: slow blinking really is a form of positive emotional communication. The study found that cats were significantly more likely to slow-blink back at humans who slow-blinked at them first, and that cats preferred to approach slow-blinking humans over those with a neutral expression.

In the wild, a sustained direct gaze is a threat — it signals a predator's focus or a dominant animal's challenge. By half-closing their eyes and breaking that gaze, a cat is deliberately communicating the absence of threat. It is the visual equivalent of putting down a weapon.

What It Means for You

The slow blink — sometimes called a "cat kiss" or "eye kiss" — is one of the most intimate signals in the feline communication repertoire. When your cat slow-blinks at you across the room, they are telling you:

• They feel completely safe in your presence
• They consider you part of their social group
• They are not threatened or on guard
• They may be inviting reciprocal affection

You can initiate a slow blink yourself: make eye contact with your cat, then slowly close your eyes halfway and let them stay partially closed for a moment before opening again. Many cats will respond in kind — and research suggests this can help build trust with unfamiliar cats as well.

Reading the Full Body Language

A genuine slow blink is accompanied by relaxed body posture: ears facing forward or slightly to the side, whiskers fanned out rather than pulled back, tail still or gently curved. If your cat's body language is tense while their eyes are half-closed, they may simply be drowsy or in pain — context always matters in feline communication.

When to Be Concerned

The slow blink itself is never a cause for concern — it is a sign of a well-adjusted, trusting cat. However, if your cat has stopped making eye contact or engaging socially when they previously did, this can signal pain, illness, or anxiety worth investigating with your vet.