New York Time's Interview With A Robot (video here, no embed code) gives an interesting look at how we think about interaction and conversation. Much of the commentary around the video is on it's "disturbing" nature, reminding me of the idea I ran into once that if something attempts to appear human, but falls short of being 100%, we find it to be disturbing.
I recommend watching it. The video got me interested again in an old hobby of mine: conversing with the Jabberywacky artificial intelligence bot. Evidently the creators have now built the similar Cleverbot. I had a couple conversations with it below (the first couple of lines were cut off from the screenshot):
Kyle: Hi Cleverbot, let's talk about what it means to be human
Cleverbot: I know I am human.
Cleverbot got a little distracted at that point so I decided to start again:
Clearly, as in the above video, one of the problems we're still struggling with in terms of recreating intelligent conversation is understanding how humans react not to just individual fragments of conversations but maintain a memory of the context of entire conversations. As you might imagine this is no simple task; it requires a deceptively complex understanding of how memory works, in allowing us to relate just the right amount of information now to just the right amount of information from the past.
A good way to think of how this problem is exponentially complex is to think of the potential semiotic significance of one statement as limited to let's say just 5 different meanings. The potential expression is much more difficult to pin down when considering it within the context of an earlier statement with another five potential meanings, and another statement before that. Conversation is clearly much more than an exercise in reacting to the last thing stated.
(As an aside, I found it interesting to note that Cleverbot responds back in deliberately slow typed characters, simulating human typing. Nice touch.)