Researchers at the University of Sussex played back different kinds of cat cries to human subjects, some of whom didn’t own cats. They found that a particular kind of cat meow—” a purr mixed with a high-pitched cry,” as LiveScience describes it—was very difficult for people to ignore:
They found that humans, even if they had never had a cat themselves, judged the purrs recorded while cats were actively seeking food - the purrs with an embedded, high-pitched cry - as more urgent and less pleasant than those made in other contexts.
When the team re-synthesised the recorded purrs to remove the embedded cry, leaving all else unchanged, the human subjects’ urgency ratings for those calls decreased significantly.
McComb said she thinks this cry occurs at a low level in cats’ normal purring, “but we think that cats learn to dramatically exaggerate it when it proves effective in generating a response from humans.” In fact, not all cats use this form of purring at all, she said, noting that it seems to most often develop in cats that have a one-on-one relationship with their owners rather than those living in large households, where their purrs might be overlooked.
