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• W2249164927 abstract "User interaction with Embodied Conversational Agents (ECA) should involve a significant affective component to achieve realism in communication. This aspect has been studied through different frameworks describing the relationship between user and ECA, for instance alignment, rapport and empathy. We conducted an experiment to explore how an ECA's non-verbal expression can be controlled to respond to a single affective dimension generated by users as input. Our system is based on the mapping of a high-level affective dimension, approach/avoidance, onto a new ECA control mechanism in which Action Units (AU) are activated through a neural network. Since 'approach' has been associated to prefrontal cortex activation, we use a measure of prefrontal cortex left-asymmetry through fNIRS as a single input signal representing the user's attitude towards the ECA. We carried out the experiment with 10 subjects, who have been instructed to express a positive mental attitude towards the ECA. In return, the ECA facial expression would reflect the perceived attitude under a neurofeedback paradigm. Our results suggest that users are able to successfully interact with the ECA and perceive its response as consistent and realistic, both in terms of ECA responsiveness and in terms of relevance of facial expressions. From a system perspective, the empirical calibration of the network supports a progressive recruitment of various AUs, which provides a principled description of the ECA response and its intensity. Our findings suggest that complex ECA facial expressions can be successfully aligned with one high-level affective dimension. Furthermore, this use of a single dimension as input could support experiments in the fine-tuning of AU activation or their personalization to user preferred modalities." @default.
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• W2249164927 date "2015-11-09" @default.
• W2249164927 modified "2023-10-11" @default.
• W2249164927 title "ECA Control using a Single Affective User Dimension" @default.
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• W2249164927 doi "https://doi.org/10.1145/2818346.2820730" @default.
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