Declarative joint attention as a foundation of theory of mind.

Theories of social-cognitive development have attributed a foundational role to declarative joint attention. The present longitudinal study of 83 children, who were assessed on a battery of social-cognitive tasks at multiple measurement points from the age of 12 to 50 months, tested a predictive model of theory of mind (false-belief understanding). Thereby, declarative, but not imperative, point production predicted false-belief understanding at 50 months. Predictive relations, which remained significant beyond the influence of child gender and language abilities, and were unrelated to child temperament and emotion recognition, were not mediated by mirror self-recognition or Level 1 visual perspective taking, which were both related to joint attention. These findings conform to theoretical predictions and provide empirical support for conceptual continuity in the social domain.