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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/25674

Title: Unsupervised Learning for Mental Stress Detection - Exploration of Self-Organizing Maps
Authors: Huysmans, Dorien
Smets, Elena
De Raedt, Walter
Van Hoof, Chris
Bogaerts, Katleen
Van Diest, Ilse
Helic, Denis
Issue Date: 2018
Publisher: Scitepress
Citation: Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies, Scitepress,p. 26-35
Series/Report no.: 3
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, by 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.
URI: http://hdl.handle.net/1942/25674
DOI: 10.5220/0006541100260035
ISBN: 9789897582790
Category: C1
Type: Proceedings Paper
Appears in Collections: Research publications

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