There’s always an implicit comparison when we talk about cats as aloof little jerks, says Mikel Maria Delgado, a postdoctoral researcher on cat behavior at the University of California at Davis. And that comparison is with dogs, which humans have spent thousands more years domesticating and molding in our image. Cats, she pointed out, simply don’t have the facial muscles to make the variety of expressions a dog (or human) can. So when we look at a cat staring at us impassively, it looks like a psychopath who cannot feel or show emotion. But that’s just its face.