We investigated inadvertent plagiarism by inducing participants into a happy or sad mood before they generated items in a puzzle task. Compared to happy mood, participants induced into a sad mood made fewer memory errors in which they claimed a previously-generated idea to be new; confidence ratings in these errors, however, was higher.
Gingerich, Amanda C., "The Effect of Emotional State on Inadvertent Plagiarism Memory Errors" (2009). Scholarship and Professional Work - LAS. Paper 182.