Authors:
Dorien Huysmans
1
;
2
;
Elena Smets
2
;
1
;
Walter De Raedt
2
;
Chris Van Hoof
3
;
2
;
1
;
Katleen Bogaerts
4
;
1
;
Ilse Van Diest
1
and
Denis Helic
5
Affiliations:
1
KU Leuven, Belgium
;
2
imec, Belgium
;
3
imec, Holst Centre, Netherlands
;
4
Faculty of Medicine and Life Sciences, Hasselt University, Belgium
;
5
Graz University of Technology, Austria
Keyword(s):
Mental Stress Detection, Skin Conductance, Electrocardiogram, Unsupervised Learning, SOM.
Abstract:
One of the major challenges in the field of ambulant stress detection lies in the model validation. Commonly,
different types of questionnaires are used to record perceived stress levels. These only capture stress levels
at discrete moments in time and are prone to subjective inaccuracies. Although, many studies have already
reported such issues, a solution for these difficulties is still lacking. This paper explores the potential of unsupervised
learning with Self-Organizing Maps (SOM) for stress detection. In unsupervised learning settings,
the labels from perceived stress levels are not needed anymore. First, a controlled stress experiment was
conducted during which relax and stress phases were alternated. The skin conductance (SC) and electrocardiogram
(ECG) of test subjects were recorded. Then, the structure of the SOM was built based on a training
set of SC and ECG features. A Gaussian Mixture Model was used to cluster regions of the SOM with similar
characteristics. Finally, b
y comparison of features values within each cluster, two clusters could be associated
to either relax phases or stress phases. A classification performance of 79.0% (5:16) was reached with a
sensitivity of 75.6% (11:2). In the future, the goal is to transfer these first initial results from a controlled
laboratory setting to an ambulant environment.
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