ColdWetDog writes "Scientists now believe they've figured out what causes the uncanny valley response. They compared functional MRI scans of volunteers watching two different types of videos: those showing human-appearing androids, and those showing the humans that the robots were created to mimic. 'The results suggest that the uneasiness we feel could be caused by a "perceptual mismatch between appearance and motion."' Basically, the brain seemed to react in a strongly negative manner when the robotic motions of the android didn't match its human-like appearance."
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