This phenomenon is associated with forgotten memory. In this phenomenon, individuals tend to retrieve information from their brain assuming it new but they have already gone through it somewhere back in time and they do not realize this fact, believing it to be a new idea or new piece of information.
Diagrams
Originated from/Coined by
Alan Brown and Dana Murphy
Further Reading/ References
https://www.brainpickings.org/2014/09/26/cryptomnesia-psychology-of-writing/