Figure 1.

An infant and parent playing with a set of toys during a naturalistic free-flowing interaction. Both participants wore a head-mounted eye tracking system that recorded eye gaze data from a first-person view. Crosshairs indicated frame-by-frame gaze direction. Two gaze streams from the parent and infant indicate region of interest fixations. The bracket corresponds to which ROIs the infant and parent were gazing towards: the infant’s and parent’s gaze were on the red object. White blocks indicate when an infant or parent is not looking at either an object or face.