About 10 years ago when I was reading a lot about AI game dev I remember reading about Fuzzy State Machines ( http://www.coniserver.net/wiki/index.php/FuSM ) which were seen as an improvement from classical FSM.
I think I read it in one of the "AI programming Gems" books.
Going by the name, those are based on Fuzzy Logic, I assume - which makes sense. Some people say that the first nation to develop a true AI will be Japan, because they've been studying Fuzzy Logic theory as a field of science since decades.
I think I read it in one of the "AI programming Gems" books.