A Bottom-Up Exploration of the Dimensions of Dialog State in Spoken Interaction
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Models of dialog state are important, both scientifically and practically, but today's best build strongly on tradition. This paper presents a new way to identify the important dimensions of dialog state, more bottomup and empirical than previous approaches. Specifically, we applied Principal Component Analysis to a large number of low-level prosodic features to find the most important dimensions of variation. The top 20 out of 76 dimensions accounted for 81% of the variance, and each of these dimensions clearly related to dialog states and activities, including turn taking, topic structure, grounding, empathy, cognitive processes, attitude and rhetorical structure.
