With the introduction of advanced automation into many human-machine systems, the human is often left to monitor the automation. However, human monitoring of automated systems can be poor, especially when the operator has to accomplish other tasks (Parasuraman, Molloy & Singh, 1993). Several explanations for these automation-related monitoring inefficiencies (“complacency”) have been put forward. One view (Parasuraman et al., 1993) suggests that complacency reflects an attention allocation strategy away from the automated system due to high trust in the automation. Empirical data from two studies using eye movement recording are presented to test this theory. In the first study, students were tested on a PC-based simulation of flight-related tasks. In the second study, professional air traffic controllers performed on a medium-fidelity ATC simulator. The results supported an attentional interpretation of automation-related complacency. Implications for the design of automated systems are discussed.
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