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The measurement of brain activity by electroencephalography (EEG) is commonly used for medical diagnoses. Furthermore, there is much research in the field of brain computer interface applications (BCI). BCIs use EEG signals to provide an alternative input device for handicapped people suffering from the locked in syndrome. In this thesis EEG measurements were performed with a capacitive EEG helmet system while visual stimulation with color reversing checkerboards with different colors and frequencies. The aim was to find stimulation parameters which could provide good response so they can be used for BCI applications. One issue was to avoid the frequency range with high noise. Hence, the most often used frequencies between 8 and 20 Hz were extended to 40 Hz. Additional to the desired result of good response at higher frequencies it was found that the measured frequencies differed from those chosen in the software. Therefore, further investigations were performed to find the source of this phenomenon, for example the displayed stimulation was measured by photo transistors. It was observed that the displayed pattern switches between two frequencies. The peak in the EEG spectrum fits to the average of these two frequencies. The main source was detected as the used stimulation program in combination with Windows as not real time capable operating system. An alternative stimulation program was implemented with DirectX and measurements for comparison were performed. The frequencies were stable and not varying, not a single aberration was observed. The second aim of this thesis was to analyze the skin resistance and the resistance between two people on different conditions. Furthermore, the interpersonal transmission behavior of bioelectrical signals was observed.
Buchkauf
Erzeugung, Erfassung und interindividuelle Übertragung von Biosignalen, Katharina Olze
- Sprache
- Erscheinungsdatum
- 2017
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- Titel
- Erzeugung, Erfassung und interindividuelle Übertragung von Biosignalen
- Sprache
- Deutsch
- Autor*innen
- Katharina Olze
- Verlag
- Mensch und Buch Verlag
- Erscheinungsdatum
- 2017
- ISBN10
- 3863878299
- ISBN13
- 9783863878290
- Kategorie
- Skripten & Universitätslehrbücher
- Beschreibung
- The measurement of brain activity by electroencephalography (EEG) is commonly used for medical diagnoses. Furthermore, there is much research in the field of brain computer interface applications (BCI). BCIs use EEG signals to provide an alternative input device for handicapped people suffering from the locked in syndrome. In this thesis EEG measurements were performed with a capacitive EEG helmet system while visual stimulation with color reversing checkerboards with different colors and frequencies. The aim was to find stimulation parameters which could provide good response so they can be used for BCI applications. One issue was to avoid the frequency range with high noise. Hence, the most often used frequencies between 8 and 20 Hz were extended to 40 Hz. Additional to the desired result of good response at higher frequencies it was found that the measured frequencies differed from those chosen in the software. Therefore, further investigations were performed to find the source of this phenomenon, for example the displayed stimulation was measured by photo transistors. It was observed that the displayed pattern switches between two frequencies. The peak in the EEG spectrum fits to the average of these two frequencies. The main source was detected as the used stimulation program in combination with Windows as not real time capable operating system. An alternative stimulation program was implemented with DirectX and measurements for comparison were performed. The frequencies were stable and not varying, not a single aberration was observed. The second aim of this thesis was to analyze the skin resistance and the resistance between two people on different conditions. Furthermore, the interpersonal transmission behavior of bioelectrical signals was observed.