The Theory of Mind

There's been a big, big push in the last 20 years of putting some computational meat on the theoretical bones. One of the principles has been proposed for this thing is like, well, if I think that you have a mind that your mind might be different from my own. So how can we test that? And there you get these like classic studies of a particular aspect of theory of mind, which is false belief. The three year olds don't seem to behave as though they understand false belief and four year olds do.