(a) Single frame from the video stimulus. (b) Regions of interest (ROIs) used in analysis for the frame in Figure 1a. Labeled regions are Eyes (E), Mouth (M), Body (B), Hands Area (H), Toys (T), and Background (BG). The scene subtended 27 × 21 degrees of visual angle, the Face 3.9 × 5.6, Mouth 3.5 × 2.0, and the individual Toys 5.8 × 6.4.