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Micromachines 2016, 7(2), 20; doi:10.3390/mi7020020

Mental Fatigue Monitoring Using a Wearable Transparent Eye Detection System

1
Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
2
Media Lab, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
3
JST PRESTO, 7 Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Kazunori Hoshino
Received: 20 August 2015 / Revised: 15 January 2016 / Accepted: 18 January 2016 / Published: 26 January 2016
View Full-Text   |   Download PDF [3017 KB, uploaded 26 January 2016]   |  

Abstract

We propose mental fatigue measurement using a wearable eye detection system. The system is capable of acquiring movement of the pupil and blinking from the light reflected from the eye. The reflection is detected by dye-sensitized photovoltaic cells. Since these cells are patterned onto the eyeglass and do not require external input power, the system is notable for its lightweight and low power consumption and can be combined with other wearable devices, such as a head mounted display. We performed experiments to correlate information obtained by the eye detection system with the mental fatigue of the user. Since it is quite difficult to evaluate mental fatigue objectively and quantitatively, we assumed that the National Aeronautics and Space Administration Task Load Index (NASA-TLX) had a strong correlation with te mental fatigue. While a subject was requested to conduct calculation tasks, the eye detection system collected his/her information that included position, velocity and total movement of the eye, and amount and frequency of blinking. Multiple regression analyses revealed the correlation between NASA-TLX and the information obtained for 3 out of 5 subjects. View Full-Text
Keywords: eye; wearable; micro; microelectromechanical systems; dye sensitized photovoltaic device; sensor; mental state; monitoring; fatigue eye; wearable; micro; microelectromechanical systems; dye sensitized photovoltaic device; sensor; mental state; monitoring; fatigue
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sampei, K.; Ogawa, M.; Torres, C.C.C.; Sato, M.; Miki, N. Mental Fatigue Monitoring Using a Wearable Transparent Eye Detection System. Micromachines 2016, 7, 20.

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