Abstract
Several acoustic pulse parameters expected to affect the perceived urgency in auditory signals were investigated in a factorial experiment for objective measures of operator performance in a complex occupational environment. 18 experienced subjects, system console operators at Kennedy Space Center, participated in the experiment where the effects of manipulation of inter-pulse interval and pulse format were evaluated for self-reported workload ratings and objective effects in complex, multi-task performance. The results confirmed the prediction of inter-pulse interval effecting reaction times. Subjective workload ratings were equal for all format and interval combinations. Accuracy of primary task measures, in terms of erroneous operator actions, was also equal for all signal combinations. A secondary tracking task was imbedded in the evaluation for workload adjustment and resource allocation measurement. The performance on the secondary task was significantly influenced by signal design, and the objective performance measures countermand the predictions of perceived urgency effects based on previous studies. The study results are interpreted for development and design of a system of auditory alarms for the Checkout and Launch Control Systems at Kennedy Space Center.
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