In a breif mention in Discovery magazine, they note that the University of California has found the countries with a high rate of toxoplasmosis (from a cat bourn parisite) have a high rate of neurosis.
Jokes aside, I wonder if there’s some sort of feedback loop going on with the stereotypical crazy cat lady. She’s got cats, they make her a bit off, she gets more cats, they make her a bit more off…