It's this ... It's a treatment for things like phobias, irrational fears. Say you're scared of snakes. The therapist shows you a picture of a snake so you can get used to it, train yourself not to be afraid of it. Then they show you a video, then a real snake in a cage across the room, then you get closer ...

[ She waves a hand. ] Et cetera et cetera. Make you face your fears, basically.