Page 137 - Emotions through the eyes of our closest living relatives- Exploring attentional and behavioral mechanisms

Figure 2. Stills of the videos used in the experiment with yawns on the left and controls on the right. A: Avatar*, B: Familiar adult 1, C: Familiar adult 2, D: Unfamiliar adult 1, E: Unfamiliar adult 2.
*To decrease the chances of pseudo-replication within this category we created horizontally mirrored copies of the yawn and control videos of the avatar such that – similar to the other triggers – we had two yawn and two control videos in total.
Evidence for yawn contagion in orangutans
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