Uncanny valley

The uncanny valley is a hypothesis in the field of human aesthetics which holds that when human features look and move almost, but not exactly, like natural human beings, it causes a response of revulsion among some human observers. The "valley" refers to the dip in a graph of the comfort level of humans as subjects move toward a healthy, natural human likeness described in a function of a subject's aesthetic acceptability. Examples can be found in the fields of robotics and 3D computer animation, among others.

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

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