Three-year olds participated in a deceptive action as part of another person's false-belief test. Found that children who had strategically planned a deception were better at answering questions about another's false beliefs than children who had merely watched the deceptive action. This effect was not found when children performed the same action…

To determine whether children younger than four have an authentic theory of mind, studies relying on deceptive hiding measures for indexing false belief were carried out. Children accurately anticipated the impact of deceptive strategies on the behavior and belief of opponents and used information management to help and hinder others' efforts. (BC)

Children's use of the terms "lie" and "truth" was examined. Participants were 150 subjects in five groups: nursery schoolers, preschoolers, first graders, fifth graders, and adults. Results support the development of definitional prototypes for the concepts of lie and truth. (RH)