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Current signing avatars are often described as unnatural as they cannotaccurately reproduce all the subtleties of synchronized body behaviors of ahuman signer. In this paper, we propose a new dynamic approach for transitionsbetween signs, focusing on mouthing animations for Portuguese Sign Language.Although native signers preferred animations with dynamic transitions, we didnot find significant differences in comprehension and perceived naturalnessscores. On the other hand, we show that including mouthing behaviors improvedcomprehension and perceived naturalness for novice sign language learners.Results have implications in computational linguistics, human-computerinteraction, and synthetic animation of signing avatars.

Enhancing Portuguese Sign Language Animation with Dynamic Timing and Mouthing