2,182 research outputs found
Agents for educational games and simulations
This book consists mainly of revised papers that were presented at the Agents for Educational Games and Simulation (AEGS) workshop held on May 2, 2011, as part of the Autonomous Agents and MultiAgent Systems (AAMAS) conference in Taipei, Taiwan. The 12 full papers presented were carefully reviewed and selected from various submissions. The papers are organized topical sections on middleware applications, dialogues and learning, adaption and convergence, and agent applications
Towards Learning ‘Self’ and Emotional Knowledge in Social and Cultural Human-Agent Interactions
Original article can be found at: http://www.igi-global.com/articles/details.asp?ID=35052 Copyright IGI. Posted by permission of the publisher.This article presents research towards the development of a virtual learning environment (VLE) inhabited by intelligent virtual agents (IVAs) and modeling a scenario of inter-cultural interactions. The ultimate aim of this VLE is to allow users to reflect upon and learn about intercultural communication and collaboration. Rather than predefining the interactions among the virtual agents and scripting the possible interactions afforded by this environment, we pursue a bottomup approach whereby inter-cultural communication emerges from interactions with and among autonomous agents and the user(s). The intelligent virtual agents that are inhabiting this environment are expected to be able to broaden their knowledge about the world and other agents, which may be of different cultural backgrounds, through interactions. This work is part of a collaborative effort within a European research project called eCIRCUS. Specifically, this article focuses on our continuing research concerned with emotional knowledge learning in autobiographic social agents.Peer reviewe
Observation-based expectation generation and response for behavior-based artificial creatures
Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 1999.Includes bibliographical references (leaves 66-69).This thesis seeks to address the incorporation of a low-level cognitive ability into reactive, behavior-based artificial intelligence architectures. Specifically, it addresses the need to generate short-term, observation-based expectations about the world and react appropriately to the violation of those expectations. In it I discuss the motivation for incorporating expectations into a reactive behavior-based architecture, outline the qualitative properties of expectations and the conditions under which they may be violated, propose a model for generating expectations and responding to their violation, detail one implementation of such a model, and finally propose this work as a starting point from which future work on higher-order cognition and behavior might begin.by Christopher John Kline.S.M
ABC-EBDI: A cognitive-affective framework to support the modeling of believable intelligent agents.
El Grupo de Investigación de Interfaces Avanzadas (AffectiveLab), es un grupo reconocido por el Gobierno de Aragón (T60-20R) cuya actividad se enmarca en el área de la Interacción Humano-Computadora (IHC). Su actividad investigadora se ha centrado, en los últimos años, en cuatro temas principales: interacción natural, informática afectiva, accesibilidad e interfaces basadas en agentes inteligentes, siendo esta última en la que se enmarca esta tesis doctoral. Más concretamente, la realización de esta tesis doctoral se enmarca dentro de los proyectos de investigación nacionales JUGUEMOS (TIN2015-67149-C3-1R) y PERGAMEX (RTI2018-096986-B-C31). Una de sus lÃneas de investigación se centra en el desarrollo de arquitecturas cognitivo-afectivas para apoyar el modelado afectivo de los agentes inteligentes. El AffectiveLab tiene una sólida experiencia en el uso de agentes de interfaz incorporados que exhiben expresiones afectivas corporales y faciales (Baldassarri et al., 2008). En los últimos años, se han centrado en el modelado del comportamiento de los agentes inteligentes (Pérez et al., 2017).La definición de agente inteligente es un tema controvertido, pero se puede decir que es una entidad autónoma que recibe información dinámica del entorno a través de sensores y actúa sobre el medio ambiente a través de actuadores, mostrando un comportamiento dirigido a un objetivo (Russell et al., 2003). El modelado de los procesos cognitivos en los agentes inteligentes se basa en diferentes teorÃas (Moore, 1980; Newell, 1994; Bratman, 1987) que explican, desde diferentes puntos de vista, el funcionamiento de la mente humana. Los agentes inteligentes implementados sobre la base de una teorÃa cognitiva se conocen como agentes cognitivos. Los más desarrollados son los que se basan en arquitecturas cognitivas, como Soar (Laird et al., 1987), ACT-R (Anderson, 1993) y BDI (Rao and Georgeff, 1995). Comparado con Soar y otras arquitecturas complejas, BDI se destaca por su simplicidad y versatilidad. BDI ofrece varias caracterÃsticas que la hacen popular, como su capacidad para explicar el comportamiento del agente en cada momento, haciendo posible una interacción dinámica con el entorno. Debido a la creciente popularidad del marco BDI se ha utilizado para apoyar el modelado de agentes inteligentes (Larsen, 2019; (Cranefield and Dignum, 2019). En los últimos años, también han aparecido propuestas de BDI que integran aspectos afectivos. Los agentes inteligentes construidos en base a la arquitectura BDI que también incorporan capacidades afectivas, se conocen como agentes EBDI (Emotional BDI) y son el foco de esta tesis. El objetivo principal de esta tesis ha sido proponer un marco cognitivo-afectivo basado en el BDI que sustente el modelado cognitivo-afectivo de los agentes inteligentes. La finalidad es ser capaz de reproducir un comportamiento humano creÃble en situaciones complejas donde el comportamiento humano es variado y bastante impredecible. El objetivo propuesto se ha logrado con éxito en los términos descritos a continuación:• Se ha elaborado un exhaustivo estado del arte relacionado con los modelos afectivos más utilizados para modelar los aspectos afectivos en los agentes inteligentes.• Se han estudiado las arquitecturas de BDI y las propuestas previas de EBDI. El estudio, que dio lugar a una publicación (Sánchez-López and Cerezo, 2019), permitió detectar las cuestiones abiertas en el área, y la necesidad de considerar todos los aspectos de la afectividad (emociones, estado de ánimo, personalidad) y su influencia en todas las etapas cognitivas. El marco resultante de este trabajo doctoral incluye también el modelado de la conducta y el comportamiento comunicativo, que no habÃan sido considerados hasta ahora en el modelado de los agentes inteligentes. Estos aspectos colocan al marco resultante entre EBDI los más avanzados de la literatura. • Se ha diseñado e implementado un marco basado en el BDI para soportar el modelado cognitivo, afectivo y conductual de los agentes inteligentes, denominado ABC-EBDI (Sanchez et al., 2020) (Sánchez et al., 2019). Se trata de la primera aplicación de un modelo psicológico muy conocido, el modelo ABC de Ellis, a la simulación de agentes inteligentes humanos realistas. Esta aplicación implica:o La ampliación del concepto de creencias. En el marco se consideran tres tipos de creencias: creencias básicas, creencias de contexto y comportamientos operantes. Las creencias básicas representan la información general que el agente tiene sobre sà mismo y el entorno. Las conductas operantes permiten modelar la conducta reactiva del agente a través de las conductas aprendidas. Las creencias de contexto, que se representan en forma de cogniciones frÃas y calientes, se procesan para clasificarlas en creencias irracionales y racionales siguiendo las ideas de Ellis. Es la consideración de creencias irracionales/racionales porque abre la puerta a la simulación de reacciones humanas realistas.o La posibilidad de gestionar de forma unificada las consecuencias de los acontecimientos en términos de consecuencias afectivas y de comportamiento (conducta). Las creencias de contexto racionales conducen a emociones funcionales y a una conducta adaptativa, mientras que las creencias de contexto irracionales conducen a emociones disfuncionales y a una conducta maladaptativa. Este carácter funcional/disfuncional de las emociones no se habÃa utilizado nunca antes en el contexto del BDI. Además, el modelado conductual se ha ampliado con el modelado de estilos comunicativos, basado en el modelo Satir, tampoco aplicado previamente al modelado de agentes inteligentes. El modelo de Satir considera gestos corporales, expresiones faciales, voz, entonación y estructuras lingüÃsticas.• Se ha elegido un caso de uso, "I wish a had better news" para la aplicación del marco propuesto y se han realizado dos tipos de evaluaciones, por parte de expertos y de usuarios. La evaluación ha confirmado el gran potencial del marco propuesto para reproducir un comportamiento humano realista y creÃble en situaciones complejas.<br /
Comprehensive Believable Non Player Characters Creation and Management Tools for Emergent Gameplay
This thesis seeks a way to integrate popular psychosocial components required for believability to build a believable Non Player Characters (NPCs) model using the techniques of emergence. The believable NPCs model is scalable in terms of psychosocial models, customizable, flexible and data-driven. Comprehensive believable NPCs creation and management tools were developed to compose, generate, and maintain the system configuration data, as well as NPC profile data, using XML. Furthermore, a run-time prototype has been developed based on our proposed model to test its effectiveness. The prototype has also been evaluated for believable emergent behaviours in different social scenarios
Normative Emotional Agents: a viewpoint paper
[EN] Human social relationships imply conforming to the norms, behaviors and cultural values of the society, but also socialization of emotions, to learn how to interpret and show them. In multiagent systems, much progress has been made in the analysis and interpretation of both emotions and norms. Nonetheless, the relationship between emotions and norms has hardly been considered and most normative agents do not consider emotions, or vice-versa. In this article, we provide an overview of relevant aspects within the area of normative agents and emotional agents. First we focus on the concept of norm, the different types of norms, its life cycle and a review of multiagent normative systems. Secondly, we present the most relevant theories of emotions, the life cycle of an agent¿s emotions, and how emotions have been included through computational models in multiagent systems. Next, we present an analysis of proposals that integrate emotions and norms in multiagent systems. From this analysis, four relationships are detected between norms and emotions, which we analyze in detail and discuss how these relationships have been tackled in the reviewed proposals. Finally, we present a proposal for an abstract architecture of a Normative Emotional Agent that covers these four norm-emotion relationships.This work was supported by the Spanish Government project TIN2017-89156-
R, the Generalitat Valenciana project PROMETEO/2018/002 and the Spanish
Goverment PhD Grant PRE2018-084940.Argente, E.; Del Val, E.; Pérez-GarcÃa, D.; Botti Navarro, VJ. (2022). Normative Emotional Agents: a viewpoint paper. IEEE Transactions on Affective Computing. 13(3):1254-1273. https://doi.org/10.1109/TAFFC.2020.3028512S1254127313
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Investigation of an emotional virtual human modelling method
This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.In order to simulate virtual humans more realistically and enable them life-like behaviours, several exploration research on emotion calculation, synthetic perception, and decision making process have been discussed. A series of sub-modules have been designed and simulation results have been presented with discussion.
A visual based synthetic perception system has been proposed in this thesis, which allows virtual humans to detect the surrounding virtual environment through a collision-based synthetic vision system. It enables autonomous virtual humans to change their emotion states according to stimuli in real time. The synthetic perception system also allows virtual humans to remember limited information within their own First-in-first-out short-term virtual memory.
The new emotion generation method includes a novel hierarchical emotion structure and a group of emotion calculation equations, which enables virtual humans to perform emotionally in real-time according to their internal and external factors. Emotion calculation equations used in this research were derived from psychologic emotion measurements. Virtual humans can utilise the information in virtual memory and emotion calculation equations to generate their own numerical emotion states within the hierarchical emotion structure. Those emotion states are important internal references for virtual humans to adopt appropriate behaviours and also key cues for their decision making.
The work introduces a dynamic emotional motion database structure for virtual human modelling. When developing realistic virtual human behaviours, lots of subjects were motion-captured whilst performing emotional motions with or without intent. The captured motions were endowed to virtual characters and implemented in different virtual scenarios to help evoke and verify design ideas, possible consequences of simulation (such as fire evacuation).
This work also introduced simple heuristics theory into decision making process in order to make the virtual human’s decision making more like real human. Emotion values are proposed as a group of the key cues for decision making under the simple heuristic structures. A data interface which connects the emotion calculation and the decision making structure together has also been designed for the simulation system
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