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Until now, research on arrangement of verbal and non-verbal information in multimedia presentations has not considered multimodal behavior of animated agents. In this paper, we will present an experiment exploring the effects of different types of speech–gesture cooperation in agents’ behavior: redundancy (gestures duplicate pieces of information conveyed by speech), complementarity (distribution of information across speech and gestures) and a control condition in which gesture does not convey semantic information. Using a Latin-square design, these strategies were attributed to agents of different appearances to present different objects. Fifty-four male and 54female users attended three short presentations performed by the agents, recalled the content of presentations and evaluated both the presentations and the agents. Although speech–gesture cooperation was not consciously perceived, it proved to influence users’ recall performance and subjective evaluations: redundancy increased verbal information recall, ratings of the quality of explanation, and expressiveness of agents. Redundancy also resulted in higher likeability scores for the agents and a more positive perception of their personality. Users’ gender had no influence on this set of results

The effects of speech–gesture cooperation in animated agents’ behavior in multimedia presentations