What Does a Cat’s Slow Blink Reveal About Its Trust and Mood?

What Does a Cat’s Slow Blink Reveal About Its Trust and Mood?

When a cat slowly closes its eyes toward you, many pet owners instinctively read it as a sign of affection, trust, or relaxation. But what does the science say? In this article we unpack the subtle feline eye language, the research behind it, and what it means for the bond you share with your cat.

Understanding the Slow Blink

Scientists describe a cat’s slow blink as a “slow‑blink sequence.” It typically begins with a series of half‑blinks—partial eye closures—followed by a noticeably longer, full or near‑full eye closure.

A typical sequence might look like:

Half blink – Half blink – Half blink – Close the eyes.

Blinking vs. Slow Blinking

Unlike a reflexive blink that serves to lubricate the eye, a slow blink is a deliberate action. It does not serve the same physiological purposes—such as spreading tears or removing debris—but rather functions as a communicative signal.

Why We Pay Attention to Feline Eyes

Humans naturally read facial cues to gauge emotion, a skill that extends to our interactions with cats. Research has shown that cats, too, interpret human facial expressions and adjust their behavior accordingly.

A notable study involving 36 cat–owner pairs found that 79% of cats looked to their guardians for guidance when confronted with an unfamiliar object. A guardian’s calm expression encouraged the cat to remain nearby, whereas a fearful look prompted the cat to seek safety elsewhere.

The Slow Blink as a Sign of Contentment

Slow blinking shares similarities with the human “Duchenne smile,” a genuine expression of happiness that involves the orbicularis oculi muscle around the eyes. This muscle is also present in cats, suggesting that a slow blink may signal true contentment.

Other animals exhibit analogous eye‑wrinkling behaviors. Horses, for example, display subtle eye corners when they’re relaxed or rewarded, and cows show less white in their eyes when they’re in positive emotional states.

Mirror Images: Humans Influence Cat Behavior

Research with 18 shelter cats in the UK found that cats were more likely to slow‑blink at an owner who first slow‑blinked at them. A similar pattern emerged with 18 owned cats: they slow‑blinked more when their guardians or unfamiliar researchers slow‑blinked at them.

These findings suggest that slow blinking is a form of positive emotional communication between species.

Anxiety and the Slow Blink?

In the same shelter study, cats identified as anxious—those that hid or refused food—displayed more slow blinking. While the exact role of slow blinking in anxiety reduction remains unclear, it may function as a submissive or calming gesture.

Adoption Advantage

Interestingly, shelter cats that slow‑blinked more frequently were adopted faster, indicating that humans respond positively to the signal of calmness or affection. A survey of 1,100 UK cat guardians found that 69% associated a slow‑blinking cat with relaxation.

Share Your Love of Cats

Dawn LaFontaine

Dawn LaFontaine is a lifelong animal lover who always seems to have a little pet hair in her keyboard. Her blog, Kitty Contemplations, helps cat guardians better understand and care for the special beings they share their lives and homes with. Her cat‑products business, Cat in the Box, sells beautiful, well‑made, and award‑winning products that she designed to meet the biological needs of cats.

FOOTNOTES

[7] Are Eyes a Mirror of the Soul? What Eye Wrinkles Reveal about a Horse’s Emotional State. Hintze S, Smith S, Patt A, Bachmann I, Würbel H (2016). PLOS ONE 11(10): e0164017. https://doi.org/10.1371/journal.pone.0164017

[9] Humphrey T, Stringer F, Proops L, McComb K. Slow Blink Eye Closure in Shelter Cats is Related to Quicker Adoption. Animals (Basel). 2020 Nov 30;10(12):2256. doi: 10.3390/ani10122256. PMID: 33266179; PMCID: PMC7761381. https://pmc.ncbi.nlm.nih.gov/articles/PMC7761381/

[11] Humphrey T, Stringer F, Proops L, McComb K. Slow Blink Eye Closure in Shelter Cats is Related to Quicker Adoption.

[12] ibid