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Dingus, T. A., Klauer, S. G., Neale, V. L., Petersen, A., Lee, S. E., Sudweeks, J., Perez, M. A., Hankey, J., Ramsey, D., Gupta, S., Bucher, C., Doerzaph, Z. R., Jermeland, J., & Knipling, R. R. (2006). The 100-Car Naturalistic Driving Study, Phase ii—Results of the 100-Car Field Experiment Performed by Virginia Tech Transportation Institute, Blacksburg, VA, Sponsored by National Highway Traffic Safety Administration, Washington DC, April 2006, DOT HS 810 593 - April 2006.

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• TITLE: EEG-Based Estimation and Classification of Mental Fatigue

  AUTHORS: Leonard J. Trejo, Karla Kubitz, Roman Rosipal, Rebekah L. Kochavi, Leslie D. Montgomery

  KEYWORDS: EEG, Mental Fatigue, Alertness, Drowsiness

  JOURNAL NAME: Psychology, Vol.6 No.5, April 9, 2015

  ABSTRACT: Mental fatigue was associated with increased power in frontal theta (θ) and parietal alpha (α) EEG rhythms. A statistical classifier can use these effects to model EEG-fatigue relationships accurately. Participants (n = 22) solved math problems on a computer until either they felt exhausted or 3 h had elapsed. Pre- and post-task mood scales showed that fatigue increased and energy decreased. Mean response times rose from 6.7 s to 7.9 s but accuracy did not change significantly. Mean power spectral densities or PSDs of θ and α bands rose by 29% and 44%, respectively. A kernel partial least squares classifier trained to classify PSD coefficients (1 - 18 Hz) of single 13-s EEG segments from alert or fatigued task periods was 91% to 100% accurate. For EEG segments from other task periods, the classifier outputs tracked the time course of the development of mental fatigue. By this measure, most subjects became substantially fatigued after 60 min of task performance. However, the trajectories of individual classifier outputs showed that EEG signs of developing fatigue were present in all subjects after 15 - 30 minutes of task performance. The results show that EEG can track the development of mental fatigue over time with accurate updates on a time scale a short as 13 seconds. In addition, the results agree with the notion that growing mental fatigue produces a shift away from executive and attention networks to default mode and is accompanied by a shift in alpha frequency to the lower alpha band.