The impact of an embodied agent's emotional expressions over multiple interactions

The impact of simulated embodied agent emotion has been explored in short-term studies, but no work to date has examined its impact in longer interactions that involve multiple interactions with agents. We present an embodied agent (Rachael) that simulates a health professional and attempts to help people improve their fruit and vegetable consumption. Emotional and unemotional versions of the agent were developed to examine how user perceptions of the agent changed over an intervention period of 49 days and in turn how this influenced fruit and vegetable consumption. Results found that whilst participants consumed more daily portions of fruit and vegetables over the intervention period and reduced their consumption gains post-intervention, there was no significant difference in consumption gains over time between those who interacted with the emotional or unemotional agents. Qualitative feedback, however, highlighted a strong preference for the emotional agent. A novelty effect was also observed where the agents were perceived more positively initially and less so over time.