'I need a break': the effect of choice of rest break duration on vigilance.

Vigilance is the ability to sustain attention for an extended period of time and to respond to infrequently occurring critical signals. One of the most replicable findings within the vigilance literature is the performance decrement; the decline in performance as time on task increases. In an effort to attenuate the decrement, and decrease the workload and stress associated with vigilance, the present study investigated the role of choice of rest break duration on vigilance performance, perceived workload, and stress. Participants were assigned to one of three conditions: (1) choice condition, (2) no-choice condition (yoked-control), and (3) a no-break control condition. Participants completed a sensory vigilance task and common measures of workload and stress. A vigilance decrement was observed in all conditions. Participants in the choice condition exhibited more conservative responses and fewer false alarms than the no-choice condition. Across all conditions, task engagement and worry decreased, and distress increased. Practitioner Summary: This study shows the impact of rest breaks and autonomy on vigilance task performance. The findings suggest that resource theory is a plausible explanation for the vigilance decrement. Additionally, providing a choice in rest break length changes the operator's criterion following the break. Abbreviations: TSA: transportation security administration; SART: sustained attention to response task; ERP: event-related potential; S-DT: self-determination theory; ISI: interstimulus interval; DSSQ: dundee stress state questionnaire; CFQ: cognitive failures questionnaire; BP: boredom proneness; NASA-TLX: NASA task load index; IMI: intrinsic motivation inventory.