Eye-Tracking Measure of Joint Attention
This eye-tracking measure was developed and described in detail by Swanson et al. Participants viewed a series of 8 video clips, presented in random order. In the center of the screen, the participant saw the head and face of a model, while targets appeared and disappeared in each of the four corners. Half of the videos were congruent (i.e., the model’s gaze and concurrent head turn followed the target on the screen) and intended to engender a joint attention experience, while the other half of the videos were incongruent (i.e., the model’s gaze and head were directed elsewhere). See Fig. 1 for a detailed timeline of a sample video.