Date of Submission

Spring 2013

Academic Program


Project Advisor 1

Sarah Dunphy-Lelii

Abstract/Artist's Statement


Theory of Mind and Executive Function are both crucial aspects of cognitive development that are seen to emerge between ages three and five. Past research has indicated there is a relationship formed between these two competencies, but the link is still unclear. The current study tests the hypothesis that this relationship is influenced by the presence of siblings. This study assessed 40 three to five year olds’ abilities on Theory of Mind and Executive Function tasks. The children with siblings were compared to only-children, specifically looking to see if older siblings have an effect. The results did not show that siblings had a significant impact on the relationship between Theory of Mind and Executive Function. However, higher scores on Theory of Mind tasks were correlated with higher scores on Executive Function Tasks.

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