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This study investigates how different virtual agent (VA) behaviors influencesubjects' perceptions and group decision-making. Participants carried outexperimental group discussions with a VA exhibiting varying levels ofengagement and affective behavior. Engagement refers to the VA's focus on thegroup task, whereas affective behavior reflects the VA's emotional state. Thefindings revealed that VA's engagements effectively captured participants'attention even in the group setting and enhanced group synergy, therebyfacilitating more in-depth discussion and producing better consensus. On theother hand, VA's affective behavior negatively affected the perceived socialpresence and trustworthiness. Consequently, in the context of group discussion,participants preferred the engaged and non-affective VA to the non-engaged andaffective VA. The study provides valuable insights for improving the VA'sbehavioral design as a team member for collaborative tasks.

Engaged and Affective Virtual Agents: Their Impact on Social Presence, Trustworthiness, and Decision-Making in the Group Discussion