“…Even preschoolers discriminate happy faces from negatively valenced emotions (Widen & Russell, 2008a), and by 5 years of age children have adult-like sensitivity thresholds for facial displays of happiness (Gao & Maurer, 2009). In contrast, children continue to confuse fear with other negatively valenced emotions until at least 10 years of age (Camras & Allison, 1985;Durand et al, 2007;Gao & Maurer, 2009;Kolb et al, 1992;Vicari et al, 2000;Widen & Russell, 2003;Widen & Russell, 2008b). Given the ease with which children categorized happy and sad expressions, I hypothesized that, like adults, children's categorization of happy versus sad expressions would not be influenced by body posture.…”