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A Model for the Generation and Combination of Emotional Expressions

In this paper we introduce a model, called Expression Generator, which generates facial expressions related to pseudo emotions and behavior of chatterbots, which are characters used as front ends of dialogue systems employed in Web sites. The emotions are articulated as sequences of MPEG-4 compliant facial displays, and visualized in a browser-embedded player. We define a set of operators to combine facial displays and propose an algebraic model to control the stream of expressions.