A New Feature For Cross-Day Psychophysiological Workload Estimation
2016 15th IEEE International Conference on Machine Learning and Applications (ICMLA)(2016)
摘要
Classification of operator functional state for workload estimation using electroencephalograph (EEG) has proven difficult in cross-day scenarios due to non-stationarity of the feature and target distributions. This study analyzes multi-day data collected from a Multi-Attribute Task Battery (MATB) workload study using a new feature generation methodology which examines not just the average power, but also the variability of the power distribution in the clinical frequency bands over a 10 second sliding temporal window. High versus low workload levels were predicted for day five of the study based on training three traditional classifiers-Linear Discriminant Analysis (LDA), random forest, and K-Nearest Neighbors (KNN)-on the first four days' results. Frequency-domain power distribution variance was statistically significant between conditions, suggesting it as a salient feature. Including variance as a feature enabled a cross-day workload classification accuracy improvement of 5.8% above models only using mean power. Furthermore, the individual classifiers were combined into a time-smoothed composite classifier which capitalized on the differences in features selected in the models to improve overall classification accuracy to greater than 80%.
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关键词
EEG,Operator Functional State Assessment,Workload,Variance of Frequency Domain Power,Feature Saliency for Workload,LDA,Random Forest,KNN,Time frequency analysis
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