Author: Heo Jeong Yoon Heenam Park Kwang Suk
Publisher: MDPI
E-ISSN: 1424-8220|17|7|1485-1485
ISSN: 1424-8220
Source: Sensors, Vol.17, Iss.7, 2017-06, pp. : 1485-1485
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
Amyotrophic lateral sclerosis (ALS) patients whose voluntary muscles are paralyzed commonly communicate with the outside world using eye movement. There have been many efforts to support this method of communication by tracking or detecting eye movement. An electrooculogram (EOG), an electro-physiological signal, is generated by eye movements and can be measured with electrodes placed around the eye. In this study, we proposed a new practical electrode position on the forehead to measure EOG signals, and we developed a wearable forehead EOG measurement system for use in Human Computer/Machine interfaces (HCIs/HMIs). Four electrodes, including the ground electrode, were placed on the forehead. The two channels were arranged vertically and horizontally, sharing a positive electrode. Additionally, a real-time eye movement classification algorithm was developed based on the characteristics of the forehead EOG. Three applications were employed to evaluate the proposed system: a virtual keyboard using a modified Bremen BCI speller and an automatic sequential row-column scanner, and a drivable power wheelchair. The mean typing speeds of the modified Bremen brain–computer interface (BCI) speller and automatic row-column scanner were 10.81 and 7.74 letters per minute, and the mean classification accuracies were 91.25% and 95.12%, respectively. In the power wheelchair demonstration, the user drove the wheelchair through an 8-shape course without collision with obstacles.
Related content
Development of a Computer Writing System Based on EOG
By López Alberto Ferrero Francisco Yangüela David Álvarez Constantina Postolache Octavian
Sensors, Vol. 17, Iss. 7, 2017-06 ,pp. :
By Toyama Shigeru Tanaka Yasuhiro Shirogane Satoshi Nakamura Takashi Umino Tokio Uehara Ryo Okamoto Takuma Igarashi Hiroshi
Sensors, Vol. 17, Iss. 8, 2017-07 ,pp. :