Fig. 2.

Illustrations of the experimental method. (A) The six novel toys used in the study. The heavy and light sets of toys were perceptually identical except for their weight. (B) The experimental setup. Left and right: Eye-tracker images from the child’s and parent’s egocentric views. Middle: child and parent both wore a head-mounted eye tracker. (C) Sample data from a participant. Three streams of time-locked sensory data—eye gaze (top stream), left-hand hand contact (middle stream), and right-hand hand contact (bottom stream)—are shown from the onset of the experiment to 35 s later. Colors represent the three regions of interest: blue → the blue object; red → the red object; green → the green object.