The success of human–AI teams (HATs) requires humans to work with AI teammates in trustful ways. However, trust does not exist in a vacuum but forms through and can be influenced by interactions among teammates, leading to understudied questions about how trust or distrust can be spread within a HAT. Drawing on interviews with 36 participants who collaborated in a three-member human–AI team, we explore human perceptions of and reactions to a human or AI teammate’s (dis)trust spread about an AI teammate, and uncover the process and impact of such spread. Our findings highlight that a trustworthy (dis)trust spreader can catalyze trust contagion within a human–AI team through various social and cognitive processes. We provide one of the first empirical investigations into specific ways through which trust or distrust can be spread within HATs and people’s perceptions of such spread. We thus contribute to the effective design of AI teammates and human–AI team dynamics that foster an appropriate level of trust in future HATs.
