Understanding Human-machine Cooperation in Game-theoretical Driving Scenarios amid Mixed Traffic

This is the final version. Available on open access from ACM via the DOI in this recordIntroducing automated vehicles (AVs) on roads may challenge established norms as drivers of human-driven vehicles (HVs) interact with AVs. Our study explored drivers' decisions in game-theoretical scenarios amid mixed traffic using an online survey study. We manipulated factors including interaction types (HV-HV vs. HV-AV), scenario types (chicken game vs. public goods game), vehicle driving styles (aggressive vs. conservative), and time constraints (high vs. low). The quantitative results showed that human drivers tended to “defect” more, that is, not cooperate, against vehicles with conservative driving styles. The effect of vehicle driving styles was pronounced when interacting with AVs and in chicken game scenarios. Drivers exhibited more “defection” in public goods game scenarios and the effect of scenario types was weakened under high time constraints. Only drivers with moderate driving styles “defected” more in HV-AV interaction. Our qualitative findings provide essential insights into how drivers perceived conditions and formulated strategies for decision-making

Towards a socio cognitive perspective of presenteeism, leadership and the rise of robotic Interventions in the workplace

This thesis intends to investigate the relationship between the presenteeism phenomenon and the leadership construct, by analyzing a new concept in the literature, leadership presenteeism. Second, it explores robotic leadership and the impact of human-leadership styles in teams headed by social robots. Third, it investigates the role of robots as health-promoting agents within workplaces, contributing to workers’ improvements in a set of organizational variables. The thesis includes seven empirical studies, divided in four papers. Paper 1 findings suggest that individuals perceive themselves as less productive when they work with a leader with a psychological or contagious illness. Paper 2 reveals that robots can properly perform leadership roles while leading human teams, and achieve the same organizational outcomes as human leaders. Moreover, robots performing both transformational and transactional leadership styles can impact positively different organizational outcomes. In paper 3 a robot was used as a health behavior promoting agent in a single-arm intervention, with two assessment points in time. Results showed that the intervention with the robot enabled to improve a set of psychological health behavior constructs. Finally, paper 4 aimed to compare the health behavior change intervention between two groups: one guided by a robotic agent and the other by a human agent. Results showed that the intervention with the robot agent was associated with improvements in individuals’ productivity despite presenteeism and well-being levels. This thesis contributes to the understanding of the relationship between presenteeism and leadership constructs, while seeks also to contribute and extend SCT and HAPA theoretical framework.A presente tese pretende analisar a relação entre o fenómeno do presentismo e o construto de liderança, através da análise de um novo conceito na literatura, a liderança de presentismo. Em segundo lugar, explora a liderança robótica e o impacto dos estilos de liderança humana em equipas lideradas por robôs. Terceiro, investiga o papel dos robôs como agentes promotores da saúde nos locais de trabalho, contribuindo para a melhoria de um conjunto de variáveis organizacionais. A tese inclui sete estudos empíricos, divididos em quatro artigos. Os resultados do artigo 1 sugerem que os indivíduos se consideram menos produtivos quando trabalham com um líder com uma doença psicológica ou contagiosa. O artigo 2 revela que os robôs podem desempenhar corretamente papéis de liderança em equipas humanas, alcançando os mesmos resultados organizacionais que os líderes humanos. Além disso, os robôs podem desempenhar tanto estilos de liderança transformacional como transacional, com impactos positivos em diversos resultados organizacionais. No artigo 3 foi utilizado um robô como agente promotor de comportamentos de saúde. Os resultados mostraram que a intervenção permitiu melhorar um conjunto de variáveis ligadas a comportamentos psicológicos de saúde. Finalmente, o artigo 4 visou comparar a mesma intervenção entre dois grupos: um guiado por um agente robótico e o outro por um agente humano. Os resultados mostraram que a intervenção com o agente robô esteve associada a melhorias na produtividade dos indivíduos e nos respetivos níveis de bem-estar. Esta tese contribui para a compreensão da relação entre o presentismo e a liderança, ao mesmo tempo que procura também contribuir e alargar o quadro teórico da SCT e do modelo HAPA

Human-Robot Teams – Paving the Way for the Teams of the Future

Thanks to advances in artificial intelligence and robotics, robots, and especially social robots that can naturally interact with humans, are now found in more and more areas of our lives. At the same time, teams have been the norm in organizations for decades. To bring these two circumstances together, this dissertation addresses the use of social robots together with humans in teams, so-called human-robot teams (HRTs). This work aims to advance knowledge about HRTs and important underlying mechanisms in the establishment of such teams, thereby providing insights in two aspects. First, a structured and universal definition of HRTs is derived from the various perspectives of extant research, and based on a comprehensive literature overview, important characteristics and influencing factors of HRTs as well as research gaps in HRT research are identified. Second, insights into the underlying mechanisms of the establishment of human-robot teams are provided for settings with social robots in two different team roles: team assistant and lower-level (team) manager. For this purpose, this dissertation contains three research studies that cover the currently largely unexplored area of social robots' use in organizational teams at both the employee and lower-level manager levels. The first study (conceptual study) provides a foundation for this dissertation and beyond by developing a structured and universal definition of HRTs. It also structures extant research on HRTs and proposes an agenda for future research on HRTs based on research gaps identified in a comprehensive literature review that includes 194 studies on HRTs. The second and third studies (empirical studies 1 and 2) use empirical online studies to address two of the research gaps identified in the conceptual study. They examine the underlying mechanisms in decisions for social robots in two different team roles: team assistant (empirical study 1) and team manager (empirical study 2). By looking at expectations and experiences of taskwork-/performance-related and teamwork-related/relational features of social robots using polynomial regressions and response surface analyses, these studies rely on expectation disconfirmation theory to provide a detailed investigation of the underlying mechanisms of organizational decisions for social robots. Empirical study 1 thereby shows that for teamwork, positive disconfirmation and high levels of experiences lead to higher acceptance of humanoid and android robotic team assistants, and similar results emerge for a humanoid robot’s taskwork skills. In contrast, for taskwork skills of android team assistants, high levels of positive disconfirmation lead to lower robot acceptance. For robotic lower-level managers, empirical study 2 shows that there are discrepancies in the evaluation of performance-related usefulness and relational attitude. While for usefulness a slight overfulfilment of expectations leads to a positive impact on the readiness to work with, before evaluations decrease with greater overfulfillment, for attitude increasing positive experiences are associated with (decreasing) positive evaluations of readiness. In summary, this dissertation contributes to scientific research on HRTs by advancing the understanding of HRTs, providing a structured and universal definition of HRTs, and suggesting avenues for future research. The systematic investigation of underlying mechanisms for the selection of different types of social robots for different team roles provides a holistic view of this new form of organizational teams. In addition to the research contributions, this thesis also provides practical guidance for the successful establishment of HRTs in organizations