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C. A. Mann

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Publications by C. A. Mann (bibliography)

1993

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Sterman, M. B., Kaiser, D. A., Mann, C. A., Suyenobu, B. Y., Beyma, D. C. and Francis, J. R. (1993): Application of Quantitative EEG Analysis to Workload Assessment in an Advanced Aircraft Simulator. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 118-121.

“A fully portable quantitative EEG assessment system was used to evaluate workload in an advanced technology aircraft simulator. Air refueling and landing approach tasks were each performed at two difficulty levels in 15 Air Force pilots. Averaged and trended EEG spectral data were compared in the 8-12 Hz band to identify functional requirements for increased workload within and between tasks. A progressive suppression of 8-12 Hz activity at medial and right parietal sites accompanied increased workload in the air refueling task, while a sustained suppression at right and left temporal sites was associated with increased workload in the landing task. These findings suggest a potential electrophysiological index for workload. They also identify specific and differential cortical responses to visual integration in air refueling and working memory in ILS approach as primary correlates of the cognitive requirements for these tasks in these subjects.”

1992

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Sterman, M. B., Mann, C. A., Eriksen, H. R., Olff, M. and Ursin, H. (1992): Electroencephalographic Correlates of Psychological Defense. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 76-80.

“The Kragh tachistoscopic method for measuring psychological defense mechanisms ("Defense Mechanism Test" -- DMT) has been claimed to be valid for selection of personnel for really dangerous tasks. The method consists of presenting a stimulus picture at initial exposure times that are too short for perception. To test whether this perceptual disturbance arises from an aberrant cognitive response to the situation, we studied the magnitude, topographic distribution, and temporal modulation of spectral density in the 8-12 Hz EEG frequency band during DMT testing in 22 male and 2 female active duty US Air Force personnel. Personnel with high defense mechanisms had significantly more attenuation of the 8-12 Hz activity during stimulus exposure than low defenders, implying an increased level of cortical activation. Personnel with low defense scores relax faster than those with high scores. The differences seem to occur even before threat is reported. High defense seems to require more and longer lasting data processing which may be too costly in dangerous situations.”

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