When viewing the real human and the metallic robot, the brains showed very typical reactions. But when presented with the uncanny android, the brain "lit up" like a Christmas tree.
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It suggests that the brain couldn't compute the incongruity between the android's human-like appearance and its robotic motion. In the other experiments -- when the onscreen perfomer looks human and moves likes a human, or looks like a robot and moves like a robot -- our brains are fine. But when the two states are in conflict, trouble arises.
