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Real-Time Assessment of Mental Workload Using Psychophysiological Measures and Artificial Neural Networks

U.S. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio

Christopher A. Russell

U.S. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio

The functional state of the human operator is critical to optimal system performance. Degraded states of operator functioning can lead to errors and overall suboptimal system performance. Accurate assessment of operator functional state is crucial to the successful implementation of an adaptive aiding system. One method of determining operators' functional state is by monitoring their physiology. In the present study, artificial neural networks using physiological signals were used to continuously monitor, in real time, the functional state of 7 participants while they performed the Multi-Attribute Task Battery with two levels of task difficulty. Six channels of brain electrical activity and eye, heart and respiration measures were evaluated on line. The accuracy of the classifier was determined to test its utility as an on-line measure of operator state. The mean classification accuracies were 85%, 82%, and 86% for the baseline, low task difficulty, and high task difficulty conditions, respectively. The high levels of accuracy suggest that these procedures can be used to provide accurate estimates of operator functional state that can be used to provide adaptive aiding. The relative contribution of each of the 43 psychophysiological features was also determined. Actual or potential applications of this research include test and evaluation and adaptive aiding implementation.

Human Factors: The Journal of the Human Factors and Ergonomics Society, Vol. 45, No. 4, 635-644 (2003)
DOI: 10.1518/hfes.45.4.635.27088


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