[vmception]

I’ve read that before, it engages well but I’m not sure they all know what human babies sound like, it just gets a reliable response and other frequencies are either ignored or don’t get then the response they like the most

[bitwize]

Yeah, cats don't necessarily know that, they stumble across it by trial and error. We respond to it because we are to some extent hardwired to have our attention grasped by that kind of sound, so we tend to our crying babies.