Number of co-authors:22
Number of publications with 3 favourite co-authors:Pamela S. Tsang:2Matthew E. Funke:2Gerald Matthews:2
Michael A. Vidulich's 3 most productive colleagues in number of publications:Joel S. Warm:17Victor Finomore:16Gerald Matthews:14
Design can be art. Design can be aesthetics. Design is so simple, that's why it is so complicated.
-- Paul Rand, 1997
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Michael A. Vidulich
Publications by Michael A. Vidulich (bibliography)
Funke, Matthew E., Warm, Joel S., Matthews, Gerald, Riley, Michael, Finomore, Victor, Funke, Gregory J., Knott, Benjamin and Vidulich, Michael A. (2010): A Comparison of Cerebral Hemovelocity and Blood Oxygen Saturation Levels During Vigilance Performance. In: Proceedings of the Human Factors and Ergonomics Society 54th Annual Meeting 2010. pp. 1345-1349.
This study compared measures of cerebral blood flow velocity (CBFV) and blood oxygen saturation (rSO2), during the performance of a 40-min vigilance task. Observers monitored a simulated air-traffic control display for flight path deviations which occurred in a unidirectional or a multidirectional context. CBFV and rSO2 measures were secured from the medial cerebral arteries in the left and right cerebral hemispheres and from the corresponding frontal lobes, respectively. Performance efficiency was greater in the unidirectional than the multidirectional condition and declined over time in both conditions, more so in the multidirectional condition. This pattern of results was paralleled in different ways by the two hemodynamic measures. A result of this sort challenges the assumption of a close tie between cerebral blood flow and oxygen saturation (Siesjo, 1978) and supports recent findings (Mintun et al., 2001) that cerebral blood flow and oxygen levels are not tightly coupled in active brain states.
© All rights reserved Funke et al. and/or HFES
Warm, Joel S., Finomore, Victor, Shaw, Tyler H., Funke, Matthew E., Hausen, Michelle J., Matthews, Gerald, Taylor, Purcell, Vidulich, Michael A., Repperger, Daniel W., Szalma, James L. and Hancock, Peter A. (2009): Effects of Training with Knowledge of Results on Diagnosticity in Vigilance Performance. In: Proceedings of the Human Factors and Ergonomics Society 53rd Annual Meeting 2009. pp. 1066-1070.
Making accurate diagnostic decisions about signal presence/absence is critical for success in many failure intolerant monitoring technologies requiring sustained attention or vigilance. This study examined the effects of training with knowledge of results (KR) on observer diagnosticity in a vigilance task. Diagnosticty was measured in terms of decision theory measures of positive predictive power (PPP) -- precision in indicating when signals were actually present and negative predictive power (NPP) -- precision when indicating signal absence. Initial training with KR enhanced observers' diagnosticity on a subsequent test task in terms of PPP but not NPP. The picture of performance efficiency reflected by both diagnostic measures differed from results indexed by signal detection theory (SDT) measures of perceptual sensitivity (d') and response bias (c). However as predicted from the computational mechanics of the decision theory and SDT measures, both diagnostic measures correlated positively with d' while NPP correlated negatively with c. These findings indicate that combinations of perceptual ability and level of responding can influence the behavioral metrics signifying diagnosticity in vigilance performance.
© All rights reserved Warm et al. and/or their publisher
Judge, Carol Lynn, Bushman, James B., Vidulich, Michael A., Houck, Michael R., Siem, Frederick M., Comstock, Jr. J. Raymond and Dominguez, Cynthia O. (1992): Situation Awareness: Modelling, Measurement, and Impacts. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 40-42.
Vidulich, Michael A. and Hughes, Edward R. (1991): Testing a Subjective Metric of Situation Awareness. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 1307-1311.
Vidulich, Michael A. (1989): The Use of Judgment Matrices in Subjective Workload Assessment: The Subjective WORkload Dominance (SWORD) Technique. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 1406-1410.
One objective of the project was to determine compare two analytic algorithms for converting judgment matrices into subjective workload ratings. The original eigenvector algorithm used in Saaty's Analytic Hierarchy Process (AHP) was compared an algorithm of calculating geometric means. Also, three methods of identifying excessively inconsistent matrices were compared. Data from nine previous experiments were re-examined in the present analysis. There were no differences between the AHP ratings and the geometric mean ratings in terms of their sensitivity to the experimental manipulations. However, two of the inconsistency measures were successfully used to cull the data-sets of inconsistent matrices and improved the statistical sensitivity of one set of ratings. These findings suggest that: (1) the computationally simpler geometric means algorithm can be used as an alternative to the eigenvector algorithm, and (2) culling inconsistent matrices can sometimes improve rating sensitivity. These findings, along with previous research, demonstrate that judgment matrices can be a very valuable workload assessment tool. The essential steps for the proper use of judgment matrices in workload assessment are reviewed. A user's guide and software are also being prepared to aid researchers and practitioners.
© All rights reserved Vidulich and/or Human Factors Society
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.
© All rights reserved Vidulich and Bortolussi and/or Human Factors Society
Tsang, Pamela S. and Vidulich, Michael A. (1987): Time-Sharing Visual and Auditory Tracking Tasks. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 253-257.
Multiple resource theory suggests that distributing demands over separate resources will reduce resource competition and improve time-sharing efficiency. A recent hypothesis, however, suggests that the benefits of using separate resources for the time-shared tasks may be mitigated if the two tasks are integrated. The present experiment examined the benefits of distributing the input demands of two tracking tasks as a function of task integrality. Visual and auditory compensatory tracking tasks were used. Time-sharing two tracking tasks with the same order of control is said to be more integrated than with different orders of control. Results show that presenting the two tracking signals in two input modalities did not improve time-sharing efficiency. This was attributed to the difficulty insensitivity phenomenon. Whether utilizing the same control dynamics between the time-shared tasks could generate an integrality effect was unclear from the present data. A continuous auditory task that could offer comparable spatial information as the visual counterpart was proposed to be valuable for studying attentional processes, information display alternatives, and workload assessment.
© All rights reserved Tsang and Vidulich and/or Human Factors Society
Vidulich, Michael A. and Tsang, Pamela S. (1987): Absolute Magnitude Estimation and Relative Judgement Approaches to Subjective Workload Assessment. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 1057-1061.
Two rating scale techniques employing an absolute magnitude estimation method, were compared to a relative judgement method for assessing subjective workload. One of the absolute estimation techniques used was an unidimensional overall workload scale and the other was the multidimensional NASA-Task Load Index technique. Thomas Saaty's Analytic Hierarchy Process was the unidimensional relative judgement method used. These techniques were used to assess the subjective workload of various of single- and dual-tracking conditions. The validity of the techniques was defined as their ability to detect the same phenomena observed in the tracking performance. Reliability was assessed by calculating test-retest correlations. Within the context of the experiment, the Saaty Analytic Hierarchy Process was found to be superior in validity and reliability. These findings suggest that the relative judgement method would be an effective addition to the currently available subjective workload assessment techniques.
© All rights reserved Vidulich and Tsang and/or Human Factors Society
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