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Methods for electroencephalogram records comparison
Mikešová, Tereza ; Ronzhina, Marina (referee) ; Janoušek, Oto (advisor)
This bachelor thesis starts with a theoretical section that explores the methods of electroencephalographic records analysis. The chosen methods are suitable for signal comparison. One of the methods, specifically STFT, is subsequently used in the practical segment. The aim of the practical section is to verify the ability of the proposed method to distinguish between the signals from two groups. For these purposes, rest and mental load records are used, the load being induced by counting mathematical examples. Of the examined power parameters, the differences in the ratio of beta and alfa band power and the relative power of alfa band showed the greatest statistical significance. The most appropriate setup of STFT seems to be with the shortest time window of 2 seconds.
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Brain wakefullness detection using frequency and time-frequency EEG signal analysis
Pohludka, Aleš ; Ronzhina, Marina (referee) ; Potočňák, Tomáš (advisor)
This work describes basics of electroencephalography, measuring methods of electroen- cephalographic signals, their processing and especially the interpretation of EEG signal in frequency and time-frequency domains for mental fatigue detection purposes. Mental fatigue, its sources, consequences and connection with sensory-cognitive system and link to memory is discussed. The most basic normalized international system for measuring EEG from the scalp as well as some of the experiments that ultimately lead to mental fatigue are described. With this knowledge in mind, an experiment was prepared for inducing such a state. Ten subjects participated in the test which was conducted in la- boratory with EEG machine GES 410MR by EGI. The data were analyzed mainly with S-transform and Hilbert-Huang transform. These two transforms represent two distinct state of the art time-frequency methods of spectral analysis. The result of this work lies in evaluating the relationship between mental fatigue, errors accumulated during the task and with time.
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Adaptation of military pilots of supersonic aircrafts on stress workload
Kloudová, Gabriela ; Bahbouh, Radvan (advisor) ; Štětovská, Iva (referee)
This diploma thesis deals with impact of stress on performance of military pilots of supersonic aircrafts. The theoretical part is based on definition of the term stress, his relating theories, the strategies of coping with stress and possible methods of objectivization of mental workload. This part also provides an overview of stress occuring during flight activity and specifics of the job of military pilot. The research is based on theoretical models and previous researches and the aim is to analyze the hypothesis about the dependence of stress on performance of the military pilot.This correlation was empirically verified by experimental study conducted in tactical flight simulator designed for a training on supersonic airplanes. The mental workload was investigated by physiological data and psychological questionnaires. The results are showing the most stressful and most difficult situations that appeared during tactical combat mission. There was a significant correlation between personality, resting heart rate and the effectivity of the performance. Key words: Stress, Military pilots, Performance, Mental workload, Heart rate
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Methods for electroencephalogram records comparison
Mikešová, Tereza ; Ronzhina, Marina (referee) ; Janoušek, Oto (advisor)
This bachelor thesis starts with a theoretical section that explores the methods of electroencephalographic records analysis. The chosen methods are suitable for signal comparison. One of the methods, specifically STFT, is subsequently used in the practical segment. The aim of the practical section is to verify the ability of the proposed method to distinguish between the signals from two groups. For these purposes, rest and mental load records are used, the load being induced by counting mathematical examples. Of the examined power parameters, the differences in the ratio of beta and alfa band power and the relative power of alfa band showed the greatest statistical significance. The most appropriate setup of STFT seems to be with the shortest time window of 2 seconds.
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The use of psycho psychophysiological methods in objectivization of mental workload
Kloudová, Gabriela ; Stehlík, Luděk (referee) ; Niederlová, Markéta (referee)
This thesis is focused on possible methods of objectivization of mental workload that are on psychophysiological basis and can be used in area of military pilots. The theoretical part is based on definition of the term mental workload, its related theories, the strategies of coping with stressful situations and possible methods of objectivization of mental workload. This part also provides an overview of demanding tasks occuring during flight activity and specifics of the job of military pilots. The research is based on theoretical models and previous researches and the aim is to analyze possibilities of testing the mental workload using psychophysiological methods. This hypothesis was empirically verified by experimental study conducted in tactical flight simulator designed for a training on fighter planes. The mental workload was investigated by physiological data and psychological questionnaires. The results are showing significant difference between resting heart rate and a heart rate during flight situation so we can assume that physiological parameters are good indicator of mental workload. Further analysis refers to the most stressful and most difficult situations that appeared during tactical combat mission. There was a significant correlation between personality, resting heart rate and...
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Adaptation of military pilots of supersonic aircrafts on stress workload
Kloudová, Gabriela ; Bahbouh, Radvan (advisor) ; Štětovská, Iva (referee)
This diploma thesis deals with impact of stress on performance of military pilots of supersonic aircrafts. The theoretical part is based on definition of the term stress, his relating theories, the strategies of coping with stress and possible methods of objectivization of mental workload. This part also provides an overview of stress occuring during flight activity and specifics of the job of military pilot. The research is based on theoretical models and previous researches and the aim is to analyze the hypothesis about the dependence of stress on performance of the military pilot.This correlation was empirically verified by experimental study conducted in tactical flight simulator designed for a training on supersonic airplanes. The mental workload was investigated by physiological data and psychological questionnaires. The results are showing the most stressful and most difficult situations that appeared during tactical combat mission. There was a significant correlation between personality, resting heart rate and the effectivity of the performance. Key words: Stress, Military pilots, Performance, Mental workload, Heart rate
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Brain wakefullness detection using frequency and time-frequency EEG signal analysis
Pohludka, Aleš ; Ronzhina, Marina (referee) ; Potočňák, Tomáš (advisor)
This work describes basics of electroencephalography, measuring methods of electroen- cephalographic signals, their processing and especially the interpretation of EEG signal in frequency and time-frequency domains for mental fatigue detection purposes. Mental fatigue, its sources, consequences and connection with sensory-cognitive system and link to memory is discussed. The most basic normalized international system for measuring EEG from the scalp as well as some of the experiments that ultimately lead to mental fatigue are described. With this knowledge in mind, an experiment was prepared for inducing such a state. Ten subjects participated in the test which was conducted in la- boratory with EEG machine GES 410MR by EGI. The data were analyzed mainly with S-transform and Hilbert-Huang transform. These two transforms represent two distinct state of the art time-frequency methods of spectral analysis. The result of this work lies in evaluating the relationship between mental fatigue, errors accumulated during the task and with time.
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