Infants' understanding of occlusion of others' line-of-sight: Implications for an emerging theory of mind

Infants' gaze following provides information about their understanding of others' perception and attention. Gaze following when the other looks in the presence (and absence) of visual obstacles can be especially informative. In the present study the gaze-following behaviour of 14- and 18-month-old infants was examined in opaque barrier, clear barrier, and non-barrier situations in order to investigate whether infants at this age understand the referential nature of looking. A hypothesis positing that infants grasp the referential nature of gaze would predict that infants would not follow gaze when the looker's gaze is blocked (as in an opaque barrier situation), but would follow gaze in both non-barrier and clear barrier situations. This hypothesis was contrasted with two other leaner'' interpretations predicting contrasting patterns of looking in the same situations. Results showed that both 18- and 14-month-old infants followed gaze as predicted by the richer, referential account.