Med Biol Eng Comput - Removal of large muscle artifacts from transcranial magnetic stimulation-evoked EEG by independent component analysis.

Tópicos

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Resumo

We present two techniques utilizing independent component analysis (ICA) to remove large muscle artifacts from transcranial magnetic stimulation (TMS)-evoked EEG signals. The first one is a novel semi-automatic technique, called enhanced deflation method (EDM). EDM is a modification of the deflation mode of the FastICA algorithm; with an enhanced independent component search, EDM is an effective tool for removing the large, spiky muscle artifacts. The second technique, called manual method (MaM) makes use of the symmetric mode of FastICA and the artifactual components are visually selected by the user. In order to evaluate the success of the artifact removal methods, four different quality parameters, based on curve comparison and frequency analysis, were studied. The dorsal premotor cortex (dPMC) and Broca's area (BA) were stimulated with TMS. Both methods removed the very large muscle artifacts recorded after stimulation of these brain areas. However, EDM was more stable, less subjective, and thus also faster to use than MaM. Until now, examining lateral areas of the cortex with TMS-EEG has been restricted because of strong muscle artifacts. The methods described here can remove those muscle artifacts, allowing one to study lateral areas of the human brain, e.g., BA, with TMS-EEG.

Resumo Limpo

present two techniqu util independ compon analysi ica remov larg muscl artifact transcrani magnet stimul tmsevok eeg signal first one novel semiautomat techniqu call enhanc deflat method edm edm modif deflat mode fastica algorithm enhanc independ compon search edm effect tool remov larg spiki muscl artifact second techniqu call manual method mam make use symmetr mode fastica artifactu compon visual select user order evalu success artifact remov method four differ qualiti paramet base curv comparison frequenc analysi studi dorsal premotor cortex dpmc broca area ba stimul tms method remov larg muscl artifact record stimul brain area howev edm stabl less subject thus also faster use mam now examin later area cortex tmseeg restrict strong muscl artifact method describ can remov muscl artifact allow one studi later area human brain eg ba tmseeg

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