Several movies have tried but all failed to produce lifelike cartoons of humans.For example，the lifeless faces in the movie Polar Express made people uncomfortable because they tried to emulate(仿真)life，but didn't get it quite right.

　　“There's something basically important about seeing a face and knowing that it is real，”says Thalia Wheatley from Dartmouth College，who co­wrote the study with his graduate student Christine Looser.Humans can see faces in anything，but we are much more discriminating when it comes to deciding what is alive and what is not.

　　Wheatley and Looser set out to explain exactly the point at which a face starts to look alive.Looser drove around New Hampshire visiting toy stores and taking pictures of dolls' faces.He then paired each doll face with a similar­looking human face and used the computer to mix the two.This made a whole continuum of pictures that were part human and part doll.

　　Volunteers looked at each picture and decided which were human and which were dolls.Looser and Wheatley found that the point，where volunteers decided that the faces were alive，was about two­thirds of the way between all­human and all­doll，closer to the human side than to the doll side.

　　The results suggest that people look at faces，particularly the eyes，for evidence that a face is alive.Objects with faces may look human，but telling the difference lets us keep our social energies for faces that can think，feel，and communicate with us.

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