An Analysis of Saccadic Eye Movements and Facial Images for Assessing Vigilance Levels During Simulated Driving

  • Authors:

  • Akinori Ueno;Shoyo Tei;Tomohide Nonomura;Yuichi Inoue

  • Affiliations:

  • Department of Electric and Electronic Engineering, School of Engineering, Tokyo Denki University, Tokyo, Japan 101-8457;Master's Program of Electronic and Computer Engineering, Graduate School of Science and Engineering, Graduate School of Tokyo Denki University, Saitama, Japan 350-0394;Master's Program of Electronic and Computer Engineering, Graduate School of Science and Engineering, Graduate School of Tokyo Denki University, Saitama, Japan 350-0394;Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan 151-0053

  • Venue:
  • EPCE '09 Proceedings of the 8th International Conference on Engineering Psychology and Cognitive Ergonomics: Held as Part of HCI International 2009
  • Year:
  • 2009

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Abstract

The authors analyzed facial video recordings and saccadic eye movements during 1-hour simulated driving in 10 subjects. Mean cross-correlation coefficient between the visually determined facial sleepiness and the proposed index of saccade (i.e. PV/D) for 9 subjects was -0.56 and the maximum coefficient of inverse cross-correlation was 0.83. Mean cross-correlation coefficient for 6 repetitive measurements for another subject was -0.72, and the maximum was 0.84. Variation in PV/D preceded that in facial sleepiness in 13 of 15 measurements and syncronized with it in other 2 measurements. From these results, we confirmed a fair potential of the PV/D to detect decline in vigilance levels earlier than facial sleepiness. We also revealed that narrow fluctuations throughout the measurement could lead to low inverse cross-correlation below 0.60 between the two indices. Therefore experimenter should pay attention to designing the experimental procedure to ensure broad fuctuations of the subject's vigilance levels in the measurement.