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What breathes life into an embodied agent or avatar? While body motions suchas facial expressions, speech and gestures have been well studied, relativelylittle attention has been applied to subtle changes due to underlyingphysiology. We argue that subtle pulse signals are important for creating morelifelike and less disconcerting avatars. We propose a method for animatingblood flow patterns, based on a data-driven physiological model that can beused to directly augment the appearance of synthetic avatars andphoto-realistic faces. While the changes are difficult for participants to"see", they significantly more frequently select faces with blood flow as moreanthropomorphic and animated than faces without blood flow. Furthermore, bymanipulating the frequency of the heart rate in the underlying signal we canchange the perceived arousal of the character.

"Warm Bodies": A Post-Processing Technique for Animating Dynamic Blood Flow on Photos and Avatars