The Cat Slow Blink: What It Means & How to Do It Back

By Sarah Bennett, Certified Animal Nutritionist

You're sitting across the room from your cat. They're watching you. Your eyes meet — and then, slowly, deliberately, they half-close their eyes and open them again. Maybe they do it twice. Then they look away casually, like nothing happened.

If you know cats, you know that meant something. That slow, deliberate eye-close is the feline equivalent of a smile — a gesture of trust, relaxation, and positive regard. And the remarkable thing is: you can do it back. This is one of those rare moments where science and cat-person intuition align perfectly.

What Is the Slow Blink?

The slow blink — sometimes called a "cat kiss" or "eye kiss" — is a slow, deliberate closing and opening of the eyes, often with a slight squint rather than a full close. It's different from a regular blink in both speed and intentionality. Regular blinks are rapid and reflexive; slow blinks are languid and directed, often accompanied by relaxed body posture and a slightly turned or neutral head.

In cat body language, direct unblinking eye contact is a threat signal. Sustained staring between cats can precede aggression. The slow blink is essentially the opposite: by partially closing the eyes, the cat is signaling that they are not threatened, not in threat-mode, and not monitoring for danger. It's a deliberate vulnerability — a communication of "I feel safe enough to close my eyes near you."

The Research: It's Scientifically Confirmed

In 2020, researchers at the University of Sussex published a peer-reviewed study specifically examining the cat slow blink. The study — led by Dr. Karen McComb — used two experiments to test whether slow blinks from humans elicited positive responses from cats.

The results were clear: cats were significantly more likely to slow blink back at a human who had slow-blinked at them compared to a human maintaining a neutral face. In a second experiment, cats were more likely to approach a slow-blinking experimenter than a neutral-faced one. The researchers concluded that slow blinking represents a positive emotional state and functions as a affiliative signal that works across species — humans can use it to communicate positively with cats, and cats respond.

This research, published in Scientific Reports, provided the first formal scientific evidence for what cat owners had long observed intuitively. Cornell's Feline Health Center includes slow blinking in their recommendations for building positive relationships with cats.

Why Does It Work Across Species?

The fact that cats respond to slow blinks from humans — not just from other cats — is fascinating. It suggests that either cats have generalized this social signal to apply to any trusted social partner, or that slow eye movements trigger positive associations across species because relaxed eye behavior is a cross-species signal of non-threat.

Many animals signal non-aggression through soft, relaxed facial expressions. Narrowed, soft eyes in many species indicate calmness rather than arousal. Cats may be picking up on this universal non-verbal cue and responding to it appropriately. Or they may have specifically learned to read human facial expressions through thousands of years of co-habitation. Probably both.

How to Do a Slow Blink at Your Cat

This is easier than it sounds, but technique matters:

1. Wait for the right moment: Choose a time when your cat is already calm and relaxed — resting, sitting comfortably, or watching you quietly. Don't try this when they're agitated or in play-mode.
2. Make soft eye contact: Look at your cat, but keep your facial muscles relaxed. Avoid staring intensely — your eyes should be soft, not wide.
3. Slowly close your eyes: Let your eyelids drop slowly — over about one to two seconds. You can squint to half-closed rather than going fully closed.
4. Hold briefly: Pause for a moment with eyes closed or squinted.
5. Open slowly: Open your eyes just as slowly, and then look away gently — don't maintain intense eye contact immediately after.
6. Be patient: Your cat may reciprocate immediately, or may take a few seconds, or may not respond to this particular attempt. Don't stare waiting for a response — that turns a friendly gesture back into a stare.

Reading Your Cat's Response

If the slow blink works, you may see your cat reciprocate with their own slow blink. They might also yawn (a calming signal in cats), look away (a social de-escalation signal meaning "I'm comfortable, no tension here"), or simply relax their body posture further. Any of these is a positive response.

If your cat looks away quickly or walks away, don't take it personally. Cats have complex social motivations and may simply not be in the mood for a social exchange at that moment. Try again another time.

Slow Blinks With Unfamiliar Cats

One of the most practical applications of the slow blink research is in interactions with unfamiliar or shy cats — at a shelter, a friend's home, or when meeting a stray. Rather than approaching directly or making sustained eye contact (which many cats find threatening), crouching to their level and offering a slow blink can signal non-threatening intent and make the cat more likely to approach.

The ASPCA recommends allowing cats to approach on their own terms and avoiding direct eye contact as a key principle of low-stress cat interaction — the slow blink neatly incorporates both of these principles.

What About Cats Who Don't Blink Back?

Some cats are less demonstrative than others. Just as some people are huggers and others prefer a respectful nod, cats vary in how openly they express affection. A cat who doesn't slow blink back isn't necessarily less bonded to you — they may express their comfort in other ways. The slow blink is a tool, not a test. Use it to communicate, not to score your cat's affection level.

The AVMA's feline resources emphasize respecting individual cat personality and recognizing that affection in cats is expressed across a wide spectrum of behaviors.