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Michael R. Bortolussi

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Publications by Michael R. Bortolussi (bibliography)

1988

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Vidulich, Michael A. and Bortolussi, Michael R. (1988): A Dissociation of Objective and Subjective Workload Measures in Assessing the Impact of Speech Controls in Advanced Helicopters. In: Proceedings of the Human Factors Society 32nd Annual Meeting 1988. pp. 1471-1475.

“Among the new technologies that are expected to aid helicopter designers are speech controls. Proponents suggest that speech controls could reduce the potential for manual control overloads and improve time-sharing performance in environments that have heavy demands for manual control. This was tested in a simulation of an advanced single-pilot, scout/attack helicopter. Objective performance indicated that the speech controls were effective in decreasing the interference of discrete responses during moments of heavy flight control activity. However, subjective ratings indicated that the use of speech controls required extra effort to speak precisely and to attend to feedback. Although the operational reliability of speech controls must be improved, the present results indicate that reliable speech controls could enhance the time-sharing efficiency of helicopter pilots. Furthermore, the results demonstrated the importance of using multiple assessment techniques to completely assess a task. Neither the objective nor the subjective measures alone provided complete information. It was the contrast between that was most informative.”

1987

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Kantowitz, Barry H., Bortolussi, Michael R. and Hart, Sandra G. (1987): Measuring Pilot Workload in a Motion Base Simulator: III. Synchronous Secondary Task. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 834-837.

“This experiment continues earlier research (Kantowitz, Hart,&Bortolussi, 1983) conducted in a GAT-1 motion-base trainer to evaluate choice-reaction secondary tasks as measures of pilot workload. The earlier work used an asynchronous secondary task presented every 22 sec regardless of flying performance. The present experiment uses a synchronous task presented only when a critical event occurred on the flying tasks. Both 2- and 4-choice visual secondary tasks were investigated. Analysis of primary flying-task results showed no decrement in RMS error for altitude, indicating that the key assumption necessary for using a choice secondary task was satisfied. Reaction times showed significant differences between Easy and Hard flight scenarios as well as being able to discriminate among flight tasks.”

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