Scientists Confirm You Can Communicate With Your Cat by Blinking Very Slowly [View all]
As someone who has both studied animal behavior and is a cat owner, it's great to be able to show that cats and humans can communicate in this way," psychologist Karen McComb of the University of Sussex in the UK explained when the results of the study were published.

"It's something that many cat owners had already suspected, so it's exciting to have found evidence for it."
If you've spent any time around cats, you've probably seen their 'partially closed eyes' facial expression, accompanied by slow blinking. It's similar to how human eyes narrow when smiling, and usually occurs when puss is relaxed and content. The expression is interpreted as a kind of cat smile.
Anecdotal evidence from cat owners has hinted that humans can copy this expression to communicate to cats that we are friendly and open to interaction.
Interesting article about cat/human communication:
https://www.sciencealert.com/scientists-confirm-you-can-communicate-with-your-cat-by-blinking-very-slowly