Development of social attention 1 Running head: DEVELOPMENT OF SOCIAL ATTENTION Measuring the development of social attention using free-viewing

How do young children direct their attention to other people in the natural world? While many studies have examined the perception of faces and of goal-directed actions, relatively little work has focused on what children will look at in unconstrained viewing environments. To address this question we showed videos of objects, faces, children playing with toys, and complex social scenes to a large sample of infants and toddlers between 3 and 30 months old. We found systematic developmental changes in what children looked at. When viewing faces alone, younger children looked more at eyes and older children more at mouths, especially when the faces were making expressions or talking. In the more complex videos, older children looked increasingly more at hands, especially when the hands were performing actions. Our results suggest that older children’s social attention is increasingly sensitive to the content of actions. Development of social attention 3 Measuring the development of social attention using