This study investigated the relation between mothers' utterances and theory of mind in a longitudinal study involving three time points over 1 year. Mothers were asked to describe some pictures to 82 children at all three time points. Mothers' use of mental state utterances in these descriptions at early time points was consistently correlated with later theory-of-mind understanding. This was true even when a number of potential mediators were accounted for, including children's own use of mental state language, their earlier theory-of-mind understanding, their language ability, their age, mothers' education, and other types of mother utterances. Mothers' mental state utterances seemed genuinely causal because early theory-of-mind ability was not related to later mother mental state utterances (i.e., it was not a reciprocal relation). Results also showed that children's desire talk preceded their talk about beliefs.
Forty-four children (mean 3.8 years) were given three false belief, a working memory, and four language tasks (each designed to tap a different aspect of syntax or semantics), and were tested again 6 months later. Once the range of scores in the language and false belief tasks were equated, there was a bidirectional relation between language and theory of mind. There was no evidence for syntax playing a unique role in the contribution of language to theory of mind. No one measure of syntax or semantics was more likely than any other to predict later false belief. Nor was false belief related more to one aspect of later language (syntax vs. semantics) than another. Our data, taken with other findings, are consistent with the idea that both syntax and semantics contribute to false belief understanding. Working memory did not mediate the relation between language and theory of mind, nor did it facilitate later false belief.
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