Attention, intentions, and the structure of discourse
Computational Linguistics
COLLAGEN: when agents collaborate with people
AGENTS '97 Proceedings of the first international conference on Autonomous agents
Establishing and maintaining long-term human-computer relationships
ACM Transactions on Computer-Human Interaction (TOCHI)
Activity sensing in the wild: a field trial of ubifit garden
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
The identification of users by relational agents
Proceedings of the 7th international joint conference on Autonomous agents and multiagent systems - Volume 1
'It's just like you talk to a friend' relational agents for older adults
Interacting with Computers
Engagement vs. Deceit: Virtual Humans with Human Autobiographies
IVA '09 Proceedings of the 9th International Conference on Intelligent Virtual Agents
Maintaining reality: Relational agents for antipsychotic medication adherence
Interacting with Computers
Proceedings of The 8th Australasian Conference on Interactive Entertainment: Playing the System
Longitudinal affective computing: virtual agents that respond to user mood
IVA'12 Proceedings of the 12th international conference on Intelligent Virtual Agents
Empirical validation of an accommodation theory-based model of user-agent relationship
IVA'12 Proceedings of the 12th international conference on Intelligent Virtual Agents
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Longitudinal studies of human-virtual agent interaction are expensive and time consuming to conduct. We present a new concept and tool for conducting such studies---the virtual laboratory---in which a standing group of study participants interacts periodically with a computer agent that can be remotely manipulated to effect different study conditions, with outcome measures also collected remotely. This architecture allows new experiments to be dynamically defined and immediately implemented in the continuously-running system without delays due to recruitment and system reconfiguration. The use of this tool in the study of a virtual agent that plays the role of an exercise counselor for older adults is described, along with the results of an initial experiment into the effects of conversational variability on user engagement and exercise behavior.