
Much like James Cameron, Robert Zemeckis has always been a director on the cutting edge of film technology. The most recent way he has cemented this title is through his exclusive use of motion capture in The Polar Express, Beowulf, and A Christmas Carol. There is a serious problem with this filming technique, however, and it is called "the uncanny valley."
In the recent issue of Scientific American a study was recently conducted at Princeton University where macaques were presented both real and animated images of monkey faces and the time looking at the faces was calculated. According to the results, the monkeys were quick to turn away from the animated faces, which scientists speculated was because, "realistic animations might resemble sickly or diseased animals because they lack subtle cues of health such as normal skin texture and hue—and that an aversion to such sights may have evolved to keep us healthy."
http://www.cinemablend.com/new/Even-Monkeys-Recognize-The-Uncanny-Valley-17463.h…