Given the rise of automation adoption in a variety of industries, it is essential we understand how individuals perceive these systems. Previous studies have found that a failure of one component in a system leads to decreased trust across a whole system, but few, if any, studies have considered how users define the confines of a system. To address this gap, this study replicated and extended Mehta et al. (2019) by incorporating measures of trust, similarity, and functional relatedness between six human crew members and six automated components. We noted that our functional relatedness and similarity measures were predictors of the magnitude of trust difference between conditions, with a high degree of shared variance. Our lack of a within subjects design means that future studies should further test whether measures approximating perceptions of ‘system’ (e.g., perceived functional relatedness and similarity) predict the size of contagion effects.

Trust is perhaps one of the most important constructs when trying to understand human interactions with systems. As such, there has been a considerable amount of research done on factors such as individual differences in trust, environmental factors affecting trust, and even ‘contagion’ effects of trust. However, at times the literature presents results that are inconsistent with existing findings, definitions, and at times even logic, with no clear path towards reconciliation. This manuscript attempts to highlight some of these inconsistencies within individual differences (personality and gender), task and environment, and system-wide trust, while also attempting to identify outstanding questions. While this review and critique do not encompass the totality of the literature, it provides representative examples of some of the issues the study of trust is facing. For each section, we offer a series of research questions, which has resulted in 17 proposed questions that need answering. Finally, we propose 3 questions that researchers should ask in every study which may help mitigate some of these issues in the future.

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