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Primerjava metod za odstranjevanje artefaktov iz signalov elektroencefalograma med gibalnimi nalogami
ID Gorjan, Daša (Author), ID Kejžar, Nataša (Mentor) More about this mentor... This link opens in a new window, ID Marušič, Uroš (Comentor)

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Abstract
Elektroencefalografija (EEG) je neinvazivna metoda za merjenje električne aktivnosti nevronov z elektrodami na površini glave. EEG signali vedno vključujejo tudi artefakte. Lastnosti EEG-ja omogočajo tudi snemanje možganske aktivnosti med gibanjem človeka, vendar v dinamičnih pogojih prihaja do več in bolj kompleksnih artefaktov, ki potrebujejo drugačno obravnavo od artefaktov v statičnih pogojih. Po pregledu literature smo se odločili za primerjavo dveh metod za odstranjevanje artefaktov iz EEG signalov med gibanjem človeka: AMICA in ASR in njuni kombinaciji v obeh vrstnih redih. Primerjavo in ovrednotenje smo naredili na različno intenzivno zašumljenih podatkih, ki smo jih simulirali s pomočjo 3D modela glave in na primeru resničnih EEG podatkov, posnetih med gibanjem človeka. Ugotovili smo, da artefakte najbolje odstranimo s kombinacijo obeh metod. Metodi se dopolnjujeta, saj AMICA zelo dobro odstranjuje ponavljajoče artefakte, ASR pa dobro odstranjuje neponavljajoče artefakte. Ugotovili smo tudi, da je učinkovitost odstranjevanja artefaktov zelo povezana s karakteristikami podatkov in artefaktov. Za dobre smernice o uporabi metod za odstranjevanje artefaktov iz EEG podatkov v dinamičnih pogojih bi potrebovali nadaljnje raziskave na področju evalvacije metod na EEG podatkih, posnetih pri različnih intenzivnostih in vrstah gibanja.

Language:Slovenian
Keywords:Elektroencefalografija, AMICA, ASR, gibalni artefakti.
Work type:Master's thesis/paper
Organization:FE - Faculty of Electrical Engineering
Year:2022
PID:20.500.12556/RUL-137721 This link opens in a new window
COBISS.SI-ID:113283843 This link opens in a new window
Publication date in RUL:29.06.2022
Views:1135
Downloads:124
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Secondary language

Language:English
Title:Comparison of movement induced artefact removal methods from electroencephalogram
Abstract:
Electroencephalography (EEG) is a non-invasive technique used to record electrical activity of brain using electrodes placed on the scalp. EEG signals always contain artifacts. Characteristics of EEG technique allow recording of brain activity under dynamic conditions. However, artifact contamination increases in frequency and complexity with movement intensity. Removal of artifacts from EEG signals recorded under dynamic conditions demands different approach in comparison to static conditions. Based on literature review we decided to compare methods AMICA and ASR and their combinations. We evaluated these methods on simulated data and on a example of real EEG signals recoded during human movement. We used 3D model of the head to simulated EEG signals with different noise intensity. Overall, artifacts were removed most thoroughly with combination of both methods. AMICA methods is good for removal of periodic artifacts, while ASR is good for removal of non-periodic artifacts with large amplitudes, therefore these two methods complement each other. Efficiency of artifact removal depends heavily on characteristics of signals and artifacts. In order to create useful guidelines about artefact removal in dynamic conditions further evaluation of methods for artifact removal on EEG signals recorded during specific types of movement and different intensities is needed.

Keywords:Electroencephalography, AMICA, ASR, movement artifacts.

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