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25508 Virtual coaches for healthy lifestyle
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op den Akker, H.J.A. and Klaassen, R. and Nijholt, A. (2016) Virtual coaches for healthy lifestyle. In: Toward Robotic Socially Believable Behaving Systems - Volume II: Modeling Social Signals. Intelligent Systems Reference Library 106. Springer Verlag, Berlin, Germany, pp. 121-149. ISSN 1868-4394 ISBN 978-3-319-31052-7

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Since the introduction of the idea of the software interface agent the question recurs whether these agents should be personified and graphically visualized in the interface. In this chapter we look at the use of virtual humans in the interface of healthy lifestyle coaching systems. Based on theory of persuasive communication we analyse the impact that the use of graphical interface agents may have on user experience and on the efficacy of this type of persuasive systems. We argue that research on the impact of a virtual human interface on the efficacy of these systems requires longitudinal field studies in addition to the controlled short-term user evaluations in the field of human computer interaction (HCI). We introduce Kristina, a mobile personal coaching system that monitors its user’s physical activity and that presents feedback messages to the user. We present results of field trials (N = 60, 7 weeks) in which we compare two interface conditions on a smartphone. In one condition feedback messages are presented by a virtual animated human, in the other condition they are displayed on the screen in text. Results of the field trials show that user motivation, use context and the type of device on which the feedback message is received influence the perception of the presentation format of feedback messages and the effect on compliance to the coaching regime.

Item Type:Book Section
Research Group:EWI-HMI: Human Media Interaction
Research Program:CTIT-General
Research Project:SMARCOS: Smart Composite Human-Computer Interfaces
Uncontrolled Keywords:Virtual coaches, Intelligent agents, Virtual humans, Personal coaching system, persuasive communication, Healthy lifestyle, longitudinal study
ID Code:25508
Deposited On:07 April 2016
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