Four studies probed preschoolers' understanding of diversity in the do
main of pretense. In Study 1, 3- and 4-year-olds were shown video skit
s in which two characters pretended different things with the same obj
ect. To assess preschoolers' understanding that the mind is involved i
n pretense, thought bubbles were superimposed over the actors' heads.
Results of this study indicated that both 3- and 4-year-olds appreciat
e the potential for diversity in pretense, and understand pretense to
be a mental activity. Results of Study 2 replicate Study 1, and argue
against alternative explanations for participants' good performance in
that study. Studies 3 and 4 compared the unique contributions made by
dialogs and thought bubbles and revealed that 3-year-olds relied more
on actors' mental contents than on their actions or dialogs when reas
oning about pretense. Results of the studies are discussed in terms of
children's developing understanding of the subjective and mental aspe
cts of pretense, and the implications of this understanding for the de
velopment of their understanding of mind more generally.