Faculty Members

Faculty of Sports and Health Sciences

Department of Sports and Health Sciences

Key words
Biological information measurement, Measurement systems, Signal processing

Doctor of Engineering / Professor

Hiroshi Sasaki


Department of Electrical Engineering, Faculty of Engineering, Keio University
Department of Electrical Engineering, Graduate School of Engineering, University of Fukui (Master’s Program)

Professional Background

Lecturer, Assistant Professor / Associate Professor, Fukui University of Technology

Consultations, Lectures, and Collaborative Research Themes

Technical consultations on the measurement of visual evoked potential
Lectures on the measurement of eye movement by the use of corneo-retinal potential

Main research themes and their characteristics

「Eye movement measurement using corneo-retinal potential」

 In the eyeball, electrical potential exists between the cornea and the retina. The cornea side has positive charge and the retina side has negative charge. This potential is called corneo-retinal potential. Since the potential changes by the eye movement, the potential variation can be amplified by the electronystagmography and it can be kept on the record as an electronystagmograph. Generally the eye movement system can be classified into two types. One is the system of the fast eye movement (saccadic eye movement) and the other is the slow eye movement (smooth pursuit eye movement). Saccadic eye movement happens when the point of gazing is changed to look at the object optionally. Smooth pursuit eye movement happens when the slow moving object is followed by the eye.
 In this study, the investigation about saccadic eye movement at the time of mutual gazing is described.

「The relation between stimulus color and visual evoked potential」

 We have visual organs which can recognize colors. They are the retina and the cerebrum. The color information is entered through the retina and it is transformed into an electric signal there. As the next step, it is sent to the visual cortex which is located in the occipital lobe of the cerebrum. We can detect the signal as a slight variation in the electroencephalogram. The electroencephalogram is defined as the time fluctuation of the potential which is generated by the electric activity of the brain. Especially, the electroencephalogram generated when a visual stimulus is given from the exterior is called the visual evoked potential.
 In this study, the influence of the difference of the stimulus colors (or the background colors) has been investigated, and the further descriptions are given, that is, how visual information processing is carried out by the retina and the cerebrum, and how the visual evoked potential is affected by the difference.

Major academic publications

“Correlation Filter Processing Simulation of the Visual Evoked Potential”
Knowledge-Based Intelligent Information Engineering Systems & Allied Technologies, KES 2002, Part 1 (2002) 749-753.
Hiroshi Sasaki, Naohiro Ishii

“A Study on Saccadic Eye Movements at the Mutual Gazing”
GESTS International Transactions on Computer Science and Engineering, 18 (2005) 125-133.
Hiroshi Sasaki, Naohiro Ishii

“A Study on the Velocity of Eye Movements”
Memoirs of the Fukui University of Technology, 37 (2007) 41-46.
Hiroshi Sasaki, Takeshi Hasegawa, Kazuhiro Murai