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An “Embodied Conversational Agent” (ECA) is a type of intelligent user interface^[1] that combines the use of gestures, facial expressions, and speech to engage in face-to-face communication with users. This technology^[3] is designed to enhance human-computer interaction by providing a more immersive and engaging experience, especially in conversational tasks. ECAs not only use verbal communication but also non-verbal channels, thus enriching the communication process. They are widely applied in various fields such as computer^[4] games, virtual training environments, and interactive storytelling^[2] systems. However, they are notably absent in major virtual assistants like Siri and Alexa. The use of ECAs is currently being explored in AI advancements in virtual worlds, with a focus on making AI more human-like. Nonetheless, they present challenges such as balancing realism with efficiency, dealing with computational limitations, addressing ethical concerns, ensuring user acceptance, and managing uncertainties in AI behavior. Despite these challenges, ECAs have the potential to revolutionize virtual experiences and influence future AI research.

Terms definitions

1. ↑ user interface. A User Interface, often abbreviated as UI, is a fundamental aspect of any digital product, system, or service. It is the point of interaction between the user and a digital device or product such as a software application or a website. The evolution of UI traces back to the 1940s, progressing from basic interfaces to more sophisticated ones like Graphical and Composite User Interfaces. It's categorized into various types including attentive, batch, command-line, conversational, and object-oriented interfaces, each designed to serve different user needs. UI design revolves around principles and practices that prioritize user ease, efficiency, and enjoyment. This includes elements like layout, color schemes, typography, and interactive components that greatly influence usability, accessibility, and user retention rates. The field of UI design is dynamic, with current trends favoring dark mode interfaces, micro-interactions, 3D elements, and augmented reality. The practice also emphasizes user research, simplicity, intuitive navigation, and iterative improvements.

2. ↑ storytelling. Storytelling is a timeless human tradition, a way of transferring knowledge, wisdom, and culture from one generation to another. It predates written language, with early forms seen in cave paintings or heard in oral epics. Storytelling evolves with time, adapting to changes in society and technology. It encompasses various forms like fairytales, folktales, myths, personal narratives, and more. Today, storytelling continues to thrive and expand, finding new expressions through digital media and role-playing games. It's not only a form of entertainment but also serves educational and therapeutic purposes. Storytelling is a powerful tool for social change, helping to address issues, teach lessons, and foster empathy and understanding among diverse audiences. From ancient cave art to modern digital narratives, storytelling remains a vital part of our shared human experience.

Embodied agent (Wikipedia)

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At artificial intelligence, an embodied agent, also sometimes referred to as an interface agent, is an intelligent agent that interacts with the environment through a physical body within that environment. Agents that are represented graphically with a body, for example a human or a cartoon animal, are also called embodied agents, although they have only virtual, not physical, embodiment. A branch of artificial intelligence focuses on empowering such agents to interact autonomously with human beings and the environment. Mobile robots are one example of physically embodied agents; Ananova and Microsoft Agent are examples of graphically embodied agents. Embodied conversational agents are embodied agents (usually with a graphical front-end as opposed to a robotic body) that are capable of engaging in conversation with one another and with humans employing the same verbal and nonverbal means that humans do (such as gesture, facial expression, and so forth).

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