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The term "uncanny valley" refers to a phenomenon in robotics, artificial intelligence, and computer graphics where humanoid objects or characters that closely resemble humans elicit a sense of unease or discomfort in observers. The concept was first introduced by the Japanese roboticist Masahiro Mori in 1970. According to Mori's hypothesis, as a robot’s appearance becomes more human-like, our emotional responses toward it become increasingly positive, but only up to a certain point.