Recent research on children's developing theory of mind (ToM) has identified the development of executive function (EF) as an essential factor that contributes to children's developing understanding of false belief (Carlson & Moses, 2001; Perner & Lang, 1999). Two particular aspects of EF (conflict inhibition and working memory), contribute to ToM, but no study had shown any relationship between ToM and EF in Japan. The present study examined aspects of EF as related to understanding of false belief in Japanese young children. Seventy children, ages 3 to 6, were given two false belief tasks, a receptive vocabulary task, and six EF tasks. The results showed that working memory was significantly related to ToM, after age and receptive vocabulary were controlled. In addition, there was a strong correlation between conflict inhibition and working memory factors. These findings suggested that conflict inhibition requires a substantial amount of working memory capacity, and that working memory capacity enables young children to operate with multiple representations in one task situation.
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