The current study examined the relation between children's language development at 2 years of age and their theory of mind performance at 4 years of age. Twenty toddlers were initially tested when they were 2 years old. Measures of both lexical and grammatical development were obtained from: (1) parental completion of the MacArthur Communicative Development Inventory (MCDI), and (2) a naturalistic play session between mother and child. The children returned at 4 years and were given four standard theory of mind tasks to assess understanding of: (a) false belief, (b) representational change, and (c) appearance-reality. In addition, in order to control for general language and cognitive development, the Peabody Picture Vocabulary Test (PPVT) and the Woodcock-Johnson Memory for Sentences Test were also given. Strong associations were found between early language development and later theory of mind performance. These relationships may reflect similar social cognitive processes that govern the development of both language and theory of mind.
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