Slow Blinking: What It Signals and How to Do It Right

A slow blink is a deliberate, unhurried closing of the eyes that lasts roughly half a second to two seconds, often with the eyes still half-shut at the end. In cats it functions as a low-threat signal: it says "I am not watching you as a target" and it lowers the tension in an encounter. Cats return slow blinks to familiar humans, and a slow blink from an unfamiliar person makes a cat more likely to approach and accept a hand. It is one of the few things you can do to a cat that reliably reduces distance rather than increasing it.

Why closing your eyes is a message

For a predator that hunts by sight, eye closure is a moment of vulnerability. A cat that closes its eyes in your presence is briefly giving up surveillance, and that is only worth doing around something it does not need to monitor. The blink is therefore read as a signal of non-hostility rather than affection in the human sense. It appears in friendly greetings between cats, in relaxed resting, and in the pause before a cat settles next to another cat.

The signal is also reciprocal. In a 2020 study by Humphrey and colleagues published in Scientific Reports, cats were more likely to slow blink back at an experimenter who slow blinked at them, and were more likely to approach the experimenter's outstretched hand afterwards. The effect was strongest when the person blinked slowly and waited, rather than blinking and reaching at the same time.

How to do it

• Get the distance right. Sit or crouch one to two metres away, at the cat's level if possible, slightly to the side rather than head-on.
• Relax your face first. Soften the jaw, drop the shoulders, and stop staring. A hard stare with a blink tacked on reads as a threat with a twitch.
• Close your eyes slowly over about one second, hold them closed for one to two seconds, then open them slowly. Aim for the speed of a cat's own blink, not a human wink.
• Repeat three to five times, then look away and wait. Do not follow the blink with a reach.
• Watch for the return. A half-blink, a slow close, or a yawn is an answer. So is the cat settling down where it is, or walking over and sitting with its back to you.
• Pair it with something good. Blink, then toss a treat to the side. Within a week most cats start approaching when they see the blink.

When it works, and when it does not

Slow blinking is a distance-reducing signal, not a reset button. It works best with a cat that is already alert and curious, at a distance where the cat is willing to eat. It does very little for a cat that is already panicking, and it can be counterproductive if you use it as a substitute for giving space: a fearful cat that is cornered does not need a blink, it needs an exit.

Do not use a slow blink as an invitation to touch. The blink lowers threat; it does not grant permission. Let the cat close the last metre, and offer a hand at nose height, below the cat's eye line, with the palm turned down or to the side.

Also be careful with direct eye contact in general. Between cats, a stare is a challenge, and a long stare followed by a slow blink is not the same message as a blink given while looking slightly away. If a cat responds to your blink by flattening its ears or lashing its tail, stop; you are too close or too direct.

What not to do

• Do not blink at a cat that is hissing, growling, or pressed into a corner. Give it distance and an escape route instead.
• Do not combine a blink with a reach, a lean, or a loud voice. The body does the talking; the eyes only confirm it.
• Do not stare and call it blinking. Prolonged eye contact with the eyelids half lowered is a stare, and cats read it as one.
• Do not assume a returned blink means the cat wants to be picked up. Many cats blink and then walk away, which is a successful interaction, not a rejection.
• Do not use blinking with a cat that is in pain or unwell as a substitute for a vet visit. Reduced interaction and half-closed eyes in a sick cat are symptoms, not communication.

When a squint is not a blink

A slow blink is symmetrical, relaxed, and ends with the eyes fully open. A squint that stays half-closed, especially on one side, with discharge, redness, rubbing, or a visible third eyelid, is blepharospasm — the eye is being held shut because it hurts. Corneal ulcers, uveitis, conjunctivitis, entropion and glaucoma all present this way, and a corneal ulcer can worsen quickly. See a vet the same day if the eye is held closed, if there is coloured discharge, or if the cat is pawing at its face. Note also that a cat with a painful eye may blink slowly when you blink at it — the response looks the same, so check the eye itself rather than assuming rapport. More on reading cats in the behaviour section; eye problems and routine checks are covered under health.

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