1. s1140184
Kenshi Hiramatsu

2.  Introduction
◦ Background
◦ Previous study
◦ Aim
 Method
◦ Wavelet transform
 Experiment
◦ Protocol
◦ Task
◦ NASA-TLX
 Present work
 Schedule
 References

3.  A wide range of stress
Physical stress, mental stress, Job stress …
If we can evaluate stress precisely, we prevent
human errors.

4.  EOG, EEG, ECG, GSR, RR… these are used to
evaluate stress in other laboratory.
EOG : electro oculogram
GSR : galvanic skin reflex
RR : respiration rate

5.  Atsuo Murata, Hiroshima City University,
evaluate mental work load using wavelet
transform of EEG. [1]
 The effect of mental stress on heart rate
variability and blood pressure during
computer work [2]

6.  12 single capital letters (A-L)
 randomly selected at eight points on the
display
 the identity of the letter and its position
varied randomly from trial to trail
Three levels of task
Low: compare one trial ago
Moderate: compare two trials ago
High: compare three trials ago

8. [1] Atsuo Murata
“An Attempt to Evaluate Mental Workload Using
Wavelet Transform of EEG”, Human Factors, Fall 2005
[2] Nis Hjortskov, Dag Rissen, Anne Katrine Blangsted,
Nils Fallentin, Ulf Lundberg, Karen Sogaard
“The effect of mental stress on heart rate variability
and blood pressure during computer work”, Eur J
Appl Physiol (2004)
[3]Kenichi Takano, Kenji Yoshino, Akihiko Nagasaka
“Basic research on measurement of mental work load
utilizing physiological information”, Japanese journal
of industrial health 32(2) pp.105-117 19900320