Stable EEG Spatiospectral Sources Using Relative Power as Group-ICA Input

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Authors

LABOUNEK R. BRIDWELL D.A. MAREČEK Radek LAMOŠ Martin MIKL Michal BRÁZDIL Milan JAN J. HLUSTIK P.

Year of publication 2019
Type Article in Proceedings
Conference WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING 2018, VOL 2
MU Faculty or unit

Central European Institute of Technology

Citation
Doi http://dx.doi.org/10.1007/978-981-10-9038-7_22
Keywords EEG; Spatiospectral ICA; Multisubject blind source separation
Description 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 c-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.
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