Social robots become increasingly human-like in appearance and behaviour. However, a large body of research shows that these robots tend to elicit negative feelings of eeriness, danger, and threat. In the present study, we explored whether and how human-like appearance and mind-attribution contribute to these negative feelings and clarified possible underlying mechanisms. Participants were presented with pictures of mechanical, humanoid, and android robots, and physical anthropomorphism (Studies 1–3), attribution of mind perception of agency and experience (Studies 2 and 3), threat to human–machine distinctiveness, and damage to humans and their identity were assessed for all three robot types. Replicating earlier research, human–machine distinctiveness mediated the influence of anthropomorphic appearance on the perceived damage for humans and their identity, and this mediation was due to anthropomorphic appearance of the robot. Perceived agency and experience did not show similar mediating effects on human–machine distinctiveness, but a positive relation with perceived damage for humans and their identity. Possible explanations are discussed.

Excessive meat consumption has a negative impact on people's health, animal welfare, and the environment in general. Remarkably, however, despite the growing number of flexitarians, only a small number of people choose a vegetarian dish at a restaurant. Therefore, in the current study, we tested how vegetarian dishes need to be presented in order to stimulate the choice for these dishes. In an online study, participants were presented with one of four different menus: Either an all vegetarian menu, an all vegetarian menu with the possibility to add meat to each dish, a menu with increased offer on vegetarian dishes with explicit indication, and a menu with increased offer on vegetarian dishes without explicit indication. Subsequently, participants indicated how likely it was that they would eat in this restaurant and which dish they would choose (i.e., vegetarian or not). Additionally, they completed a reactance questionnaire. Results show that when people get the option to add meat to the vegetarian dishes on a menu this increases the choice for a vegetarian dish. No effect of menus on reactance and willingness to eat at a restaurant was found. These findings suggest that presenting meat as an alternative or additive option can help to change behavior toward a flexitarian lifestyle.

Among elderly, the use of serious games steadily increases. Research shows that anthropomorphising digital agents (i.e., ascribing human characteristics to them) has positive short-term consequences on interactions with digital agents. However, whether these effects can also be observed over a long-term period and in a real-life setting is unknown. In two studies, we investigated the important long-term consequences of anthropomorphism among older adults (age > 50) to increase involvement in serious games. Participants read either a story that highly anthropomorphized the digital agent of a training game, or a low anthropomorphism story about that agent. To investigate long-term effect, they played the training game for three weeks, and gaming data was assessed (number of games played, time of playing, points gained). While on the short-term, the anthropomorphic story increased the humanness of the agent (Study 1), no long-term effects where found (Study 2). Furthermore, an anthropomorphic story had no influence on the gaming outcome. Our results inform app developers about which techniques are useful to humanise digital agents.

Unhealthy eating behavior has become a global health risk and thus needs to be influenced. Previous research has found that self-persuasion is more effective than direct persuasion in changing attitudes and behavioral intentions, but the influence of the cultural backgrounds of those being persuaded remains unclear. We conducted two studies to investigate the effectiveness of self-persuasion and direct persuasion techniques in promoting healthy eating intention among different ethnicities in the Netherlands. Native Dutch, Moroccan–Dutch, and Turkish–Dutch participated both online and offline. Participants saw a poster with either a self-persuasion message (“Why would you choose healthier food?”) or a direct persuasion message (“Choose healthier food!”), and were then asked to report their intention to eat healthily in the upcoming month. Significant cultural differences were found between native Dutch and Moroccan–Dutch in Study 1, and between the native Dutch and Turkish-Dutch who participated offline in Study 2. Accordingly, cultural background was found to moderate the relationship between persuasion and healthy eating intention among these groups. These results provided preliminary evidence for the moderation effect of persuasion on healthy eating intention: Self-persuasion appears to be more effective for people with an individualistic background, and direct persuasion appears to be more effective for people with a collectivistic background.