Past research with 152 preschoolers found that having an imaginary companion or impersonating an imaginary character was positively correlated with theory of mind performance. Three years later, 100 children from this study were retested to assess the developmental course of play with imaginary companions and impersonation of imaginary characters and how these types of role play were related to emotion understanding, self-perception, and personality. The results showed that school-age children interact with imaginary companions and impersonate imaginary characters as much as preschoolers. Overall, 65% of children up to the age of 7 had imaginary companions at some point during their lives. School-age children who did not impersonate scored lower on emotion understanding. Theory of mind at age 4 predicted emotion understanding 3 years later.

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Role‐play (i.e., pretending in which children imagine and act out the part of another individual) was assessed with child interviews and parent questionnaires about invisible friends, personified objects, and pretend identities in a sample of 208 young children. Children who engaged in role‐play did not differ from other children in age or vocabulary comprehension. However, they were better able to generate a pretend conversation than other children and were rated by their parents as less shy. The overall pattern of results suggests that the capacity to interact with imaginary others (in and out of the lab) is more closely associated with individual differences in personality than developmental level.

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