i don't think this is directly related to the topic, but i am familiar with the question (neanderthal theory etc.). in my opinion, the uncanny valley phenomenon most likely stems from an evolutionary trait. it enables us to recognize subtle but abnormal changes in a person's facial expressions or body movements (muscle dynamics), which could help us instinctively avoid diseased individuals or refrain from interacting with corpses. i am no animal expert but i'm quite sure deer and bovine can recognize and avoid members of their herd that are infected with brain rotting diseases and such.
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