http://en.wikipedia.org/wiki/Uncanny_valley

My hypothesis is that when people meet, they do a Turing test to determine if someone is “human enough”. That testing is done to see if their mirror neurons have sufficient consilience to be able to communicate, that is if their “theory of mind” has enough consilience.

http://daedalus2u.blogspot.com/2008/10/theory-of-mind-vs-theory-of-reality.html

If it doesn’t have enough consilience, then the error rate goes up and xenophobia is triggered. The xenophobia of the uncanny valley. It can be triggered through cultural differences (common xenophobia), or by the lack of corresponding neural structures (the antipathy exhibited toward people with autism).