Comparison of a brain-based adaptive system and a manual adaptable system for invoking automation.

OBJECTIVE: Two experiments are presented examining adaptive and adaptable methods for invoking automation. BACKGROUND: Empirical investigations of adaptive automation have focused on methods used to invoke automation or on automation-related performance implications. However, no research has addressed whether performance benefits associated with brain-based systems exceed those in which users have control over task allocations. METHOD: Participants performed monitoring and resource management tasks as well as a tracking task that shifted between automatic and manual modes. In the first experiment, participants worked with an adaptive system that used their electroencephalographic signals to switch the tracking task between automatic and manual modes. Participants were also divided between high- and low-reliability conditions for the system-monitoring task as well as high- and low-complacency potential. For the second experiment, participants operated an adaptable system that gave them manual control over task allocations. RESULTS: Results indicated increased situation awareness (SA) of gauge instrument settings for individuals high in complacency potential using the adaptive system. In addition, participants who had control over automation performed more poorly on the resource management task and reported higher levels of workload. A comparison between systems also revealed enhanced SA of gauge instrument settings and decreased workload in the adaptive condition. CONCLUSION: The present results suggest that brain-based adaptive automation systems may enhance perceptual level SA while reducing mental workload relative to systems requiring user-initiated control. APPLICATION: Potential applications include automated systems for which operator monitoring performance and high-workload conditions are of concern.

An evaluation of an adaptive automation system using a cognitive vigilance task.

The performance of an adaptive automation system was evaluated using a cognitive vigilance task. Participants responded to the presence of a green "K" in an array of two, five, or nine distractor stimuli during a 40-min vigil. The array with the target stimulus was presented once each minute. Participants EEG was recorded and an engagement index (EI = 20 x beta/(alpha + theta)) was derived. In the negative feedback condition, increases in the EI caused the number of stimuli in the array to decrease while decreases in the EI caused the number of stimuli to increase. For the positive feedback condition, increases in the index caused an increase in the array size (AS) while decreases caused a decrease in the array size. Each experimental participant had a yoked control partner who received the same pattern of changes in array irrespective of their engagement index. A vigilance decrement was seen only for the positive feedback, experimental group.