After taking turns to generate examples from a random category, participants were later asked to suggest new, previously unmentioned examples
They inadvertantly plagiarised others participants suggestions around 3-9% of the time.
We sometimes suggest others’ ideas as our own, genuinely forgetting that they are not original
See the full study here :
Brown, A. S., & Murphy, D. R. (1989). Cryptomnesia: Delineating inadvertent plagiarism. Journal of Experimental Psychology: Learning, Memory, and Cognition, 15(3), 432, https://doi.org/10.1037/0278-7393.15.3.432