Stable EEG spatiospectral sources using relative power as group-ICA input

René Labounek, David A. Bridwell, Radek Mareček, Martin Lamoš, Michal Mikl, Milan Brázdil, Jiří Jan, Petr Hluštík

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Within the last decade, various blind source separation algorithms (BSS) isolating distinct EEG oscillations were derived and implemented. Group Independent Component Analysis (group-ICA) is a promising tool for decomposing spatiospectral EEG maps across multiple subjects. However, researchers are faced with many preprocessing options prior to performing group-ICA, which potentially influences the results. To examine the influence of preprocessing steps, within this article we compare results derived from group-ICA using the absolute power of spatiospectral maps and the relative power of spatiospectral maps. Within a previous study, we used K-means clustering to demonstrate group-ICA of absolute power spatiospectral maps generates sources which are stable across different paradigms (i.e. resting-state, semantic decision, visual oddball) Within the current study, we compare these maps with those obtained using relative power of spatiospectral maps as input to group-ICA. We find that relative EEG power contains 10 stable spatiospectral patterns which were similar to those observed using absolute power as inputs. Interestingly, relative power revealed two γ-band (20–40 Hz) patterns which were present across 3 paradigms, but not present using absolute power. This finding suggests that relative power potentially emphasizes low energy signals which are obscured by the high energy low frequency which dominates absolute power measures.
Original languageEnglish (US)
Pages (from-to)125-128
Number of pages4
JournalIFMBE Proceedings
Volume68
Issue number2
DOIs
StatePublished - Jun 5 2019

Keywords

  • EEG
  • Multisubject blind source separation
  • Spatiospectral ICA

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