Summary. There are several characteristics not optimally suited for the user state classification with Wizard-of-Oz (WOZ) data like the nonuniform distribution of emotions in the utterances and the distribution of emotional utterances in speech, facial expression, and gesture. In particular, the fact that most of the data collected in the WOZ experiments are without any emotional expression gives rise to the problem of getting enough representative data for training the classifiers. Because of this problem we collected data in our own database. These data are also relevant for several demonstration sessions, where the functionality of the SMARTKOM system is shown in accordance with the defined use cases. In the following we first describe the system environment for data collection and then the collected data. At the end we will discuss the tool to demonstrate user states detected in the different modalities. 1 Database with Acted User States Because of the lack of training data we decided to build our own database and to collect uniformly distributed data containing emotional expression of user state in all three handled modalities — speech, gesture and facial expression (see Streit et al. (2006) and for an online demonstration refer to our website 1). We collected data of instructed subjects, who should express four user states for recording. Because SMARTKOM is a demonstration system it is sufficient to use instructed data for the training database. For our study we collected data from 63 naive subjects (41 male/22 female). They were instructed to act as if they had asked the SMARTKOM system for the TV program and felt content, unsatisfied, helpless or neutral with the system feedbacks. Different genres such as news, daily soap and science reports were projected onto the display for selection. The subjects were prompted with an utterance displayed on the screen and were then to indicate their internal state through voice and gesture, and at the same time, through different facial expressions.
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