1,721,021 research outputs found
Rappresentazione dell'espressività nella comunicazione non-verbale per gli agenti conversazionali
No full textTowards affective agent action: Modelling expressive ECA gestures
No full textTo enable individualized displays of personality and emotion in Embodied Conversational Agents (ECAs), a generic agent architecture is augmented to generate variable idiosyncratic gesturing behaviors. A set of dimensions of expressivity that characterize individual variability is proposed along with a mapping of the identified dimensions onto low-level animation parameters. Gesture synthesis is modified at multiple planning stages. Semantic information about the structure and communicative function of the behaviors is taken into account to guide modifications. The implementation is tested in two evaluation studies with large groups of non-expert users
Speaking with Emotions
No full textWe aim at the realization of an Embodied Conversational Agent able to interact naturally and emotionally with user(s). In previous work, we have elaborated a model that computes the nonverbal behaviors associated to a given set of communicative functions. Specifying for a given emotion, its corresponding facial expression will not produce the sensation of expressivity. To do so, one needs to specify parameters such as intensity, tension, movement property. Moreover, emotion affects also lip shapes during speech. Simply adding the facial expression of emotion to the lip shape does not produce lip readable movement. In this paper we present a model that adds expressivity to the animation of an agent at the level of facial expression as well as of the lip shape
A Model of Attention and Interest Using Gaze Behavior
No full textOne of the major problems of user’s interaction with Embodied Conversational Agents (ECAs) is to have the conversation last more than few second:after being amused and intrigued by the ECAs, users may find rapidly the restrictions and limitations of the dialog systems, they may perceive the repetition of the ECAs animation, they may find the behaviors of ECAs to be inconsistent and implausible, etc. We believe that some special links, or bonds, have to be established between users and ECAs during interaction. It is our view that showing and/or perceiving interest is the necessary premise to establish a relationship. In this paper we present a model of an ECA able to establish, maintain and end the conversation based on its perception of the level of interest of its interlocutor
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Empirical investigation of the temporal relations between speech and facial expressions of emotion
Get PDFLien vers l'article original : http://link.springer.com/article/10.1007/s12193-010-0050-4Behavior models implemented within Embodied Conversational Agents (ECAs) require nonverbal communication to be tightly coordinated with speech. In this paper we present an empirical study seeking to explore the influence of the temporal coordination between speech and facial expressions of emotions on the perception of these emotions by users (measuring their performance in this task, the perceived realism of behavior, and user preferences).We generated five different conditions of temporal coordination between facial expression and speech: facial expression displayed before a speech utterance, at the beginning of the utterance, throughout, at the end of, or following the utterance. 23 subjects participated in the experiment and saw these 5 conditions applied to the display of 6 emotions (fear, joy, anger, disgust, surprise and sadness). Subjects recognized emotions most efficiently when facial expressions were displayed at the end of the spoken sentence. However, the combination users viewed as most realistic, preferred over others, was the display of the facial expression throughout speech utterance. We review existing literature to position our work and discuss the relationship between realism and communication performance. We also provide animation guidelines and draw some avenues for future work
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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