User modeling and adaptation in health promotion dialogs with an animated character

Authors:
Fiorella de Rosis;Nicole Novielli;Valeria Carofiglio;Addolorata Cavalluzzi;Berardina De Carolis
Affiliations:
Department of Informatics, University of Bari, Italy;Department of Informatics, University of Bari, Italy;Department of Informatics, University of Bari, Italy;Department of Informatics, University of Bari, Italy;Department of Informatics, University of Bari, Italy
Venue:
Journal of Biomedical Informatics - Special issue: Dialog systems for health communications
Year:
2006

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Abstract

In this paper, we describe our experience with the design and implementation of an embodied conversational agent (ECA) that converses with users to change their dietary behavior. Our intent is to develop a system that dynamically models the agent and the user and adapts the agent's counseling dialog accordingly. Towards this end, we discuss our efforts to automatically determine the user's dietary behavior stage of change and attitude towards the agent on the basis of unconstrained typed text dialog, first with another person and then with an ECA controlled by an experimenter in a wizard of Oz study. We describe how the results of these studies have been incorporated into an algorithm that combines the results from simple parsing rules together with contextual features using a Bayesian network to determine user stage and attitude automatically.