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Bachelor's Thesis
Author of thesis: Miroslava Valoušková
Acad. year: 2025/2026
Supervisor: Ing. Martin Vítek, Ph.D.
Reviewer: Ing. Enikö Vargová
This bachelor thesis focuses on the objective detection of psychological stress through the analysis of physiological signals from wearable sensors. The theoretical part describes the psychophysiology of the stress response, particularly the activation of the sympatho-adreno-medullary (SAM) and hypothalamo-pituitary-adrenal (HPA) axes, and their manifestation in biological markers such as heart rate variability (HRV), electrodermal activity (EDA), and respiratory parameters. For the experimental part, the multimodal WESAD database was selected, containing synchronized data from the RespiBAN chest strap and the Empatica E4 wrist device. The practical part includes signal preprocessing using Butterworth filters and the subsequent extraction of more 47 features. Statistical analysis using t-test identified 26 significant markers showing significant differences between stress and rest phases. From this group, a final set of 17 independent predictors was subsequently selected on correlation analysis (threshold R >0,85). For classification, Random Forest, SVM, and XGBoost models were compared, with all achieving comparable performance (average accuracy exceeding 90 %). The Random Forest algoritm was chosen for further analysis, primarily due to its high resistence to noice and transparent interpretability of its features. The proposed system was validated using the Leave-One-Subject-Out method and tested on the independent WAUC dataset, where it reached an accuracy of 80.58 % after applying transfer learning with 20% calibration.
Stress, biological signals, environmental signals, multimodal data, detection, biological markers, WESAD, WAUC, Random Forest. XGBoost, SVM
Date of defence
16.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
C
Process of defence
Studentka prezentovala výsledky své práce a komise byla seznámena s posudky. Ing. Smital položil otázku, které příznaky se ukázaly jako nejvýznamnější pro hodnocení míry stresu a jak důležité byly parametry získané z respiračního pásu. Studentka obhájila bakalářskou práci s výhradami a odpověděl na otázky členů komise a oponenta.
Language of thesis
Czech
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Biomedical Engineering
Study programme
Biomedical Technology and Bioinformatics (BPC-BTB)
Composition of Committee
doc. Ing. Petr Kudrna, Ph.D. (předseda) Ing. Markéta Jakubíčková, Ph.D. (místopředseda) MUDr. Zuzana Nováková, Ph.D. (člen) Ing. Lukáš Smital, Ph.D. (člen) Ing. Vratislav Harabiš, Ph.D. (člen) Ing. Larisa Chmelíková, Ph.D. (člen)
Supervisor’s reportIng. Martin Vítek, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Enikö Vargová
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová