Chaotic analysis of focal accommodation system and pupil area during VDT work

Hirokazu Iwase, Atsuo Murata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Evaluation of stress during a VDT task is important when designing proper human-computer interactions. Although a number of studies have been conducted to establish the method for evaluating stress, there exists no effective method. The presence of deterministic chaos has been clarified in many complex systems, including the human brain and autonomic nervous system. However, few studies examine the change of chaotic features of accommodation and pupil area over a number of working hours. The purpose of this research is to show that the stress during VDT task could be evaluated using the chaotic features such as the fractal dimension and the first Lyapunov exponent for the focal accommodation system and the pupil area. As for the step control measurement and the fixed target measurement, the fractal dimension tended to decrease over time. This shows that the fractal dimension for the focal accommodation system and the pupil area can be used to evaluate the stress during VDT task. The first Lyapunov exponent took positive values. Not only the fractal dimension but also the first Lyapunov exponent in the fixed target measurement was larger than those in the linear control and step control measurements. The chaotic property in the fixed target measurement was higher than that in the linear control and step control measurements. However, the first Lyapunov exponent hardly changed over time for all of three accommodation measurements.

Original languageEnglish
Title of host publicationProceedings of the IEEE International Conference on Systems, Man and Cybernetics
PublisherIEEE
Volume2
Publication statusPublished - 1999
Externally publishedYes
Event1999 IEEE International Conference on Systems, Man, and Cybernetics 'Human Communication and Cybernetics' - Tokyo, Jpn
Duration: Oct 12 1999Oct 15 1999

Other

Other1999 IEEE International Conference on Systems, Man, and Cybernetics 'Human Communication and Cybernetics'
CityTokyo, Jpn
Period10/12/9910/15/99

Fingerprint

Computer terminals
Fractal dimension
Neurology
Human computer interaction
Chaos theory
Large scale systems
Brain

ASJC Scopus subject areas

  • Hardware and Architecture
  • Control and Systems Engineering

Cite this

Iwase, H., & Murata, A. (1999). Chaotic analysis of focal accommodation system and pupil area during VDT work. In Proceedings of the IEEE International Conference on Systems, Man and Cybernetics (Vol. 2). IEEE.

Chaotic analysis of focal accommodation system and pupil area during VDT work. / Iwase, Hirokazu; Murata, Atsuo.

Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 2 IEEE, 1999.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Iwase, H & Murata, A 1999, Chaotic analysis of focal accommodation system and pupil area during VDT work. in Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. vol. 2, IEEE, 1999 IEEE International Conference on Systems, Man, and Cybernetics 'Human Communication and Cybernetics', Tokyo, Jpn, 10/12/99.
Iwase H, Murata A. Chaotic analysis of focal accommodation system and pupil area during VDT work. In Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 2. IEEE. 1999
Iwase, Hirokazu ; Murata, Atsuo. / Chaotic analysis of focal accommodation system and pupil area during VDT work. Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 2 IEEE, 1999.
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