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. 2021 Aug 5;16(8):e0255570. doi: 10.1371/journal.pone.0255570

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© 2021 Kurosumi et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — (A) Viewpoint used as stimuli. Dynamically-changing facial expressions were filmed with a digital video camera from four different directions: (a) 0° rotation (front), (b) 45° rotated right in the yaw (right side), (c) 33° rotated right in the yaw and pitch above (right upward), and (d) 33° rotated right in the yaw and pitch below (right downward). (B) Equipment layout to film with a digital video camera. Dynamically changing facial expressions were filmed with a digital video camera from four different directions: (a) upper view of equipment layout, (b) front view of equipment layout.