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National Repository of Grey Literature

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Electroencephalogram (EEG) and machine learning-based classification of various stages of mental stress Lapčíková, Tereza ; Malik, Aamir Saeed (referee) ; Zaheer, Muhammad Asad (advisor) Tato závěrečná práce se věnuje rozpoznávání a klasifikaci různých úrovní psychické zátěže z elektroencefalogramu (EEG). V rámci této práce bylo vytvořeno několik modelů SVM a LSTM, které klasifikují EEG data do tří tříd odpovídajících mentální zátěži – nízká mentální zátěže, střední mentální zátěž a vysoká mentální zátěž. Proces vedoucí k tvorbě těchto modelů se skládal z kroků jako je úprava vstupního signálu, extrakce jeho vlastností a implementace modelu pro samotnou klasifikaci. Toto řešení taktéž obsahuje augmentaci dat. Nejvyšší dosažená přesnost klasifikace byla 90 %, a to s modelem SVM. Nejlepší LSTM model obsahoval tři vrstvy LSTM a přesnost jeho výsledné klasifikace byla 70 %. Detailed record

Correlation between mental stress, trapezius muscles electrical activity and electrical activity of the brain Mašková, Markéta ; Pánek, David (advisor) ; Stupková, Michaela (referee) Title: Correlation between mental stress, trapezius muscles electrical activity and electrical activity of the brain Objectives: The main goal of this thesis is to find out whether a shortterm mental stress induced by solving tests in maths, Czech language and colour word test in a time pressure increases the electrical activity in musculus trapezius and further more to evaluate the change in distribution of alfa activity in electroencephalographic record before and after undertaking the above mentioned tests. Methods: The experimental sample consisted of six university students (5 women, 1 man) at the age from 22 to 30. The electrical activity of m. trapezius pars descendens was being evaluated billateraly using the telemetric surface electromyography TeleMyo Mini of the Neurodata company, and electrical activity of the brain was being evaluated using the EEG Nicolet. The stress load was induced by solving mental tests (Czech language, mathematics and a colour word test) in a time limit. The shorten version of Eysenck Personality Questionnaire was used to determine the characteristics of the individuals. We focused mainly on determining degree of neuroticism. Results: No influence of mental load on increasing the electric activity of m. trapezius pars descendens was proven. Electroencephalographic... Detailed record

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