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Virtual humans need to be persuasive in order to promote behaviour change inhuman users. While several studies have focused on understanding the numerousaspects that influence the degree of persuasion, most of them are limited todyadic interactions. In this paper, we present an evaluation study focused onunderstanding the effects of multiple agents on user's persuasion. Along withgender and status (authoritative & peer), we also look at type of focusemployed by the agent i.e., user-directed where the agent aims to persuade byaddressing the user directly and vicarious where the agent aims to persuade theuser, who is an observer, indirectly by engaging another agent in thediscussion. Participants were randomly assigned to one of the 12 conditions andpresented with a persuasive message by one or several virtual agents. Aquestionnaire was used to measure perceived interpersonal attitude, credibilityand persuasion. Results indicate that credibility positively affectspersuasion. In general, multiple agent setting, irrespective of the focus, wasmore persuasive than single agent setting. Although, participants favoreduser-directed setting and reported it to be persuasive and had an increasedlevel of trust in the agents, the actual change in persuasion score reflectsthat vicarious setting was the most effective in inducing behaviour change. Inaddition to this, the study also revealed that authoritative agents were themost persuasive.

Is Two Better than One? Effects of Multiple Agents on User Persuasion