That takes us back to the study mentioned at the start, _Perception of psychopathy and the Uncanny Valley in virtual characters. _Angela Tinwell and her team asked subjects to rate a series of computer generated characters exhibiting a variety of facial expressions in order to test for uncanniness (the degree to which something is not familiar). The subjects were shown characters with full facial animation, a lack of upper facial animation (the eye region), and a human. What they found was that the same traits that cause us to be weirded out by some people, are the same as those that correlated highly to feelings of uncanniness—perceptions of coldness, unconcern, untrustworthiness, and in particular, a lack of a startle reaction. Which makes sense. One of the basic human indicators of a faked smile is a lack of crinkling in the eyes. The suspicion that somebody is faking their emotions makes us uneasy.