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Evaluating a realistic agent in an advice-giving task

Berry, D. C., Butler, L. T. and de Rosis, F. (2005) Evaluating a realistic agent in an advice-giving task. International Journal of Human-Computer Studies, 63 (3). pp. 304-327. ISSN 1071-5819

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To link to this item DOI: 10.1016/j.ijhcs.2005.03.006


The aim of this study was to empirically evaluate an embodied conversational agent called GRETA in an effort to answer two main questions: (1) What are the benefits (and costs) of presenting information via an animated agent, with certain characteristics, in a 'persuasion' task, compared to other forms of display? (2) How important is it that emotional expressions are added in a way that is consistent with the content of the message, in animated agents? To address these questions, a positively framed healthy eating message was created which was variously presented via GRETA, a matched human actor, GRETA's voice only (no face) or as text only. Furthermore, versions of GRETA were created which displayed additional emotional facial expressions in a way that was either consistent or inconsistent with the content of the message. Overall, it was found that although GRETA received significantly higher ratings for helpfulness and likability, presenting the message via GRETA led to the poorest memory performance among users. Importantly, however, when GRETA's additional emotional expressions were consistent with the content of the verbal message, the negative effect on memory performance disappeared. Overall, the findings point to the importance of achieving consistency in animated agents. (c) 2005 Elsevier Ltd. All rights reserved.

Item Type:Article
Divisions:Life Sciences > School of Psychology and Clinical Language Sciences
ID Code:14146
Uncontrolled Keywords:embodied animated agents, evaluation methods, believability, behaviour, consistency, CONVERSATIONAL AGENTS, OFFICE NOISE, INTERFACE, CHARACTERS, INTERACT, SPEECH

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