Current laboratory paradigms used to assess unconscious plagiarism con
sist of three tasks. first, participants generate solutions to a puzzl
e task with a partner (initial generation task); second, they recall t
heir individual contribution (recall-own task); and third, they attemp
t to create new solutions that were not offered previously (generate-n
ew task). An analysis of these tasks indicated that they differ in ter
ms of the source monitoring they require. The two generative tasks req
uire less differentiated information (e.g., familiarity) and relativel
y lax decision criteria. The recall-own task, however, demands more di
fferentiated information and more extended decision criteria. In two e
xperiments, factors known to influence source monitoring were manipula
ted. Consistent with the analysis, no effects were associated with the
generative tasks. Recall-own plagiarisms increased when self- and oth
er-generated solutions were difficult to distinguish (Experiment 1) an
d decreased when the two sources were easier to distinguish (Experimen
t 2).