The aim of this work was to analyze the performance of hypothetically
hallucination-prone subjects in source discrimination tasks. Two exper
iments were carried out with external source (pictorial and verbal) di
scrimination tasks. In Experiment 1, material and encoding task (namin
g, function, and mental imagery) were manipulated. In Experiment 2, th
e variables were material, encoding task and delay of memory test. Res
ults showed that hypothetically hallucination-prone subjects encode ex
ternal information and make use of information about prototypical feat
ures of memory traces in a similar way to non-prone subjects. These fi
ndings, discussed within Johnson and Raye's reality monitoring model,
may serve to define the conditions under which normal and abnormal sou
rce discrimination failures occur.