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In a likelihood alarm display (LAD) information about event likelihood is computed by an automated monitoring system and encoded into an alerting signal for the human operator. Operator performance within a dual-task paradigm was evaluated with two LADs: a color-coded visual alarm and a linguistically coded synthetic speech alarm. The operator's primary task was one of tracking; the secondary task was to monitor a four-element numerical display and determine whether the data arose from a "signal" or "no-signal" condition. A simulated "intelligent" monitoring system alerted the operator to the likelihood of a signal. The results indicated that (1) automated monitoring systems can improve performance on primary and secondary tasks; (2) LADs can improve the allocation of attention among tasks and provide information integrated into operator decisions; and (3) LADs do not necessarily add to the operator's attentional load.
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Robert D. Sorkin
Barry H. Kantowitz
Susan C. Kantowitz
Human Factors The Journal of the Human Factors and Ergonomics Society
Purdue University West Lafayette
Battelle
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Sorkin et al. (Mon,) studied this question.
www.synapsesocial.com/papers/6a0ee66baa1655e5fb22f8f9 — DOI: https://doi.org/10.1177/001872088803000406