Videos covered a rectangular space on the screen of 21.5 by 30.5 cm. Viewed at a distance of 60.0 cm, videos corresponded to a 20.3 by 28.5 visual angle. Face and Target AOIs were created to extend 1 cm past the silhouette of each face and target to compensate for the relative accuracy of the eye-tracker. In terms of average size, Face AOIs were 8.4 cm and circular, while Target AOIs were 7.0 cm and polygons. Viewed at a distance of 60.0 cm, Faces and Targets corresponded to an 8.0 and 6.7 visual angle. The eye-tracking system was completely non-invasive, allowing for free, unconstrained movement of the head and body.