Inadvertent "plagiarism" that occurs when people come up with an idea that they think is original, when they were actually exposed to it earlier, is known as

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Cryptomnesia is when someone comes up with an idea that they believe to be original but is actually an idea that they were exposed to before but have forgotten where or when. This type of inadvertent plagiarism can occur when the person's memory of the original source is forgotten or obscured.

Inadvertent "Plagiarism" That Occurs When People Come Up with an Idea