prikaz prve stranice dokumenta Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface
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doctoral thesis
Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2015. urn:nbn:hr:168:532722
Jerbić, Ana Branka
University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Electronic Systems and Information Processing

Cite this document

Jerbić, A. B. (2015). Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:532722

Jerbić, Ana Branka. "Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2015. https://urn.nsk.hr/urn:nbn:hr:168:532722

Jerbić, Ana Branka. "Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2015. https://urn.nsk.hr/urn:nbn:hr:168:532722

Jerbić, A. B. (2015). 'Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface', Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 25 March 2025, https://urn.nsk.hr/urn:nbn:hr:168:532722

Jerbić AB. Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2015 [cited 2025 March 25] Available at: https://urn.nsk.hr/urn:nbn:hr:168:532722

A. B. Jerbić, "Extraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface", Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2015. Available at: https://urn.nsk.hr/urn:nbn:hr:168:532722

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Metadata
TitleExtraction of movement related oscillatory changes from electroencephalogram with application to brain-computer interface
Title (croatian)Izlučivanje elektroencefalografskih oscilatornih promjena vezanih uz pokrete s primjenom na sučelje mozga i računala
AuthorAna Branka Jerbić
MBZ: 315996
MentorMario Cifrek (mentor)
Committee memberMario Cifrek (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
(Department of Electronic Systems and Information Processing)
Zagreb
Defense date and country2015, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Computing
Data Processing
Universal decimal classification
(UDC)		621.3 - Electrical engineering
Abstract
A brain computer interface (BCI) is a technology that decodes a user's intent from brain activity. Obtained information can be used to control devices in the user's environment. In this thesis, changes in sensorimotor rhythms (SMR) during motor imagery (MI) are extracted from electroencephalogram (EEG). These changes are reflected in amplitude attenuation (event related desynchronization) or enhancement (event related synchronization) of SMRs in certain brain regions. Extracted features are classified to left hand, right hand and feet MI, which is possible since MI of different parts of the body results in spatially distinct activation of motor cortex. The brain is a complex organ and interindividual differences in EEG are considerable. In this thesis, parameters influencing the classification accuracy of MI based BCI are identified and analyzed. It is demonstrated that for maximal classification accuracy a MI based BCI has to be custom designed. SMR changes can be detected using time frequency (TF) methods of analysis. A TF method called the Hilbert Huang transform (HHT) was utilized to facilitate the extraction of SMRs, while a well established band power (BP) method served as a reference method for comparison purposes. The HHT was successful in the extraction of SMR changes, but did not outperform the simple BP method. However, the HHT revealed the existence of a phenomenon that, to the author's knowledge, has not been reported previously in the literature. It concerns the increase of frequency in the MI period on the contralateral side of the brain in those intrinsic mode functions, obtained using the HHT, which contain SMRs.
Abstract (croatian)
Sučelje mozga i računala (engl. brain-computer interface, BCI) tehnologija je koja iz moždane aktivnosti dekodira namjeru korisnika. Dobivene informacije mogu se upotrijebiti za kontrolu uređaja u okruženju korisnika. U ovom se radu iz elektroencefalograma (EEG) izlučuju promjene senzomotoričkih ritmova (SMR) nastale tijekom zamišljanja pokreta. Ove promjene odnose se na smanjenje ili povećanje amplitude SMR-ova u određenim moždanim regijama. Izlučene značajke klasificiraju se kao zamišljeni pokreti lijeve ruke, desne ruke ili nogu, što je moguće zato što zamišljanje pokreta različitih dijelova tijela rezultira aktivacijom različitih dijelova motoričkog korteksa. U skladu s velikim interindividualnim razlikama u EEG-u, identificirani su i analizirani parametri koji utječu na točnost klasifikacije BCI-ova temeljenih na zamišljenim pokretima. Pokazano je da se najveća točnost klasifikacije postiže uz prilagodbu parametara pojedincu. Promjene SMR-ova mogu se detektirati upotrebom vremensko-frekvencijskih metoda. Jedna takva metoda, Hilbert Huangova transformacija (HHT), upotrijebljena je s ciljem točnijeg izlučivanja SMR-ova, a metoda značajki snage dobivenih pojasnopropusnim filtriranjem i kvadriranjem, već uobičajena u području, poslužila je kao referentna metoda. HHT je uspješno izlučio promjene SMR-ova, ali nije bio uspješniji od metode značajki snage. Ipak, HHT pruža mogućnost analize pojedinih frekvencijskih komponenti, što je omogućilo detaljnije proučavanje komponenti koje sadrže SMR-ove. Tako je razotkriven fenomen povećanja frekvencije tih komponenti tijekom zamišljanja pokreta, što je prema spoznajama autorice do sada u literaturi nezabilježeno.
Keywords
Keywords (croatian)
Languageenglish
URN:NBNurn:nbn:hr:168:532722
Study programmeTitle: Electrical Engineering and Computing
Study programme type: university
Study level: postgraduate
Academic / professional title: Doktor znanosti elektrotehnike i računarstva (Doktor znanosti elektrotehnike i računarstva)
Type of resourceText
Extent157 str. ; 30 cm.
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
RepositoryFER Repository
Created on2019-04-15 16:38:39

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