Back in the 1980s, I used to work in artificial intelligence, and it was a very wide and open discipline. Today, for some reason, I just don't see myself as working in artificial intelligence; if asked, I would describe myself as a cognitive scientist. Part of this was a shift that happened during the early stages of my PhD, when I started looking at a problem in AI, got stuck, and found myself looking at the problem itself in the field of cognitive science. But that's another and much longer story, not really worth telling now - if at all.