cryptomnesia
/ˌkrɪptə(ʊ)mˈniːzɪə/ /ˌkrɪptə(ʊ)mˈniːʒə/Chiefly Psychology
noun
The phenomenon of perceiving a latent or subconscious memory as an original thought or idea; latent or subconscious recollection.
Origin
Early 20th century. From crypto- + -mnesia, after French cryptomnésie.