Embodied agent

In artificial intelligence, an embodied 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).

Embodied Conversational Agents

Embodied conversational agents [Citation
last1 = Cassell| first1 = Justine
last2 = Sullivan| first2 = Joe
last3 = Prevost| first2 = Scott
title = Embodied Conversational Agents
publisher = MIT Press
place = Cambridge, MA
year = 2000] are a form of intelligent user interface. Graphically embodied agents aim to unite gesture, facial expression and speech to enable face-to-face communication with users: a powerful means of human-computer interaction. Face-to-face communication allows communication protocols that give a much richer communication channel than other means of communicating. It enables pragmatic communication acts such as conversational turn-taking, facial expression of emotions, information structure and emphasis, visualisation and iconic gestures, and orientation in a three-dimensional environment. This communication takes place through both verbal and non-verbal channels such as gaze, gesture, spoken intonation and body posture.

This rich style of communication that characterises human conversation makes conversational interaction with embodied conversational agents ideal for many non-traditional interaction tasks. The most familiar application of graphically embodied agents is computer games; embodied agents are ideal for this setting because the richer communication style makes interacting with the agent enjoyable. Embodied conversational agents have also been used in virtual training environments, portable personal navigation guides, interactive fiction and storytelling systems, and automated presenters and commentators.

Research has found that users prefer a non-verbal visual indication of an embodied system's internal state to a verbal indication [Citation
last1 = Marsi | first1 = Erwin
last2 = van Rooden | first2 = Ferdi
contribution = Expressing uncertainty with a talking head in a multimodal question-answering system
title = Proceedings of the Workshop on Multimodal Output Generation (MOG 2007)
place = Aberdeen, UK
pages = 105–116
year = 2007
contribution-url = http://ilk.uvt.nl/~marsi/download/pubs/marsi-van-rooden-mog07.pdf ] , demonstrating the value of additional non-verbal communication channels. As well as this, the face-to-face communication involved in interacting with an embodied agent can be conducted alongside another task without distracting the human participants, instead improving the enjoyment of such an interaction [Citation
last1 = Kipp | first1 = Michael
last2 = Kipp | first2 = Kerstin H.
last3 = Ndiaye | first3 = Alassane
last4 = Gebhard | last4 = Patrick
contribution = Evaluating the tangible interface and virtual characters in the interactive COHIBIT exhibit.
title = Proceedings of the International Conference on Intelligent Virtual Agents (IVA’06)
pages = 434-444
publisher = Springer-Verlag
year = 2006
contribution-url = http://www.dfki.de/~kipp/public_archive/Kippetal2006-IVA.pdf ] . Furthermore, the use of an embodied presentation agent results in improved recall of the presented information [Citation
last1 = Beun | first1 = Robbert-Jan
last2 = de Vos | first2 = Eveliene
last3 = Witteman | first3 = Cilia
contribution = Embodied conversational agents: Effects on memory performance and anthropomorphisation.
title = Proceedings of the International Conference on Intelligent Virtual Agents 2003,
pages = 315-319
publisher = Springer-Verlag
year = 2003
contribution-url = http://people.cs.uu.nl/rj/embodied.pdf ]

Embodied agents also provide a social dimension to the interaction. Humans willingly ascribe social awareness to computers [Citation
last1 = Nass | first1 = Clifford
last2 = Steuer | first2 = Jonathan
last3 = Tauber | first3 = Ellen R.
contribution = Computers are social actors
title = CHI ’94: Proceedings of the SIGCHI conference on Human factors in computing systems
pages = 72-78
publisher = ACM Press
address = New York, NY, USA
year = 1994
contribution-url = http://www.agent.ai/download.php?ctag=download&docID=890 ] , and thus interaction with embodied agents follows social conventions, similar to human/human interactions. This social interaction both raises the believability and perceived trustworthiness of agents, and increases the user's engagement with the systemCitation
last1 = van Mulken | first1 = Susanne
last2 = André | first2 = Elisabeth
last3 = Müller | first3 = Jochen
contribution = The persona effect: How substantial is it?
title = HCI ’98: Proceedings of HCI on People and Computers XIII
place = London, UK
pages = 53–66
year = 1988
publisher = Springer-Verlag
contribution-url = http://mm-werkstatt.informatik.uni-augsburg.de/files/publications/46/hci98.pdf ] . Rickenberg and Reeves found that the presence of an embodied agent on a website increased the level of user trust in that website; as well as this, the presence of the agent increased users' anxiety and affected their performance just as if they were being watched by a real human [Citation
last1 = Rickenberg | first1 = Raoul
last2 = Reeves | first2 = Byron
contribution = The effects of animated characters on anxiety, task performance, and evaluations of user interfaces.
title = CHI ’00: Proceedings of the SIGCHI conference on Human factors in computing systems
place = New York, NY, USA
pages = 49-56
year = 2000
publisher = ACM Press
contribution-url = http://portal.acm.org/citation.cfm?id=332406 ] . Another effect of the social aspect of agents is that presentations given by an embodied agent are perceived as more entertaining and less difficult than the same presentations given without an agent.

Related terms

* believable agents
* avatar

ome technologies

A certain number of technologies are implementing embodied agents such as:
* Microsoft Agent
* Ananova
* [http://www.cantoche.com/ Living Actors]
* [http://www.artificialindustry.com/ Artificial Industry | Virtual Agents & Avatars]

References

ee also

* Justine Cassell
* Institute for Creative Technologies

External links

* [http://ai-depot.com/GameAI/Embodied.html Embodied agents in gaming]
* [http://www.soc.northwestern.edu/justine/publications/CACM.pdf Embodied Conversational Interface Agents]