Fifty-nine 3-year-olds were tested 3 times over a period of 7 months in order to assess the contribution of theory of mind to language development and of language to theory-of-mind development (including the independent contributions of syntax and semantics). Language competence was assessed with a standardized measure of reception and production of syntax and semantics (the Test of Early Language Development). Theory of mind was assessed with false-belief tasks and appearance-reality tasks. Earlier language abilities predicted later theory-of-mind test performance (controlling for earlier theory of mind), but earlier theory of mind did not predict later language test performance (controlling for earlier language). These findings are consistent with the argument that language is fundamental to theory-of-mind development.

This meta-analysis investigates the relationship between attention-deficit/hyperactivity disorder (ADHD) and parenting stress. ADHD is a chronic, pervasive condition characterized by inattention, impulsivity, and hyperactivity

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Thirty-seven mothers and fathers were observed in their homes interacting with their 2- and 4-year-old-children at Time 1 and 2 years later. Parental mental state talk to children varied as a function of children's age, the context in which talk occurred, and the gender of the parent. Four-year-old children, with an older sibling, produced and heard more cognitive talk and less desire talk than children without an older sibling. Cognitive and feeling talk by family members at Time 1 predicted change in younger children's cognitive and feeling talk (respectively) 2 years later, after controlling for initial levels of younger children's talk and general language ability. Findings are discussed in the context of theory of mind understanding and family talk about the mind.