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Spurious correlations in simultaneous EEG-fMRI driven by in-scanner movement

  • Simultaneous EEG-fMRI provides an increasingly attractive research tool to investigate cognitive processes with high temporal and spatial resolution. However, artifacts in EEG data introduced by the MR scanner still remain a major obstacle. This study, employing commonly used artifact correction steps, shows that head motion, one overlooked major source of artifacts in EEG-fMRI data, can cause plausible EEG effects and EEG–BOLD correlations. Specifically, low-frequency EEG (< 20 Hz) is strongly correlated with in-scanner movement. Accordingly, minor head motion (< 0.2 mm) induces spurious effects in a twofold manner: Small differences in task-correlated motion elicit spurious low-frequency effects, and, as motion concurrently influences fMRI data, EEG–BOLD correlations closely match motion-fMRI correlations. We demonstrate these effects in a memory encoding experiment showing that obtained theta power (~ 3–7 Hz) effects and channel-level theta–BOLD correlations reflect motion in the scanner. These findings highlight an important caveat that needs to be addressed by future EEG-fMRI studies.

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Metadaten
Author:Markus GoldhackerORCiD, Marie-Christin FellnerORCiDGND, G. Volberg, K. J. Mullinger, Mark W. GreenleeORCiD, Simon Hanslmayr
DOI:https://doi.org/10.1016/j.neuroimage.2016.03.031
Pubmed Id:https://pubmed.ncbi.nlm.nih.gov/27012498
Parent Title (English):NeuroImage
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2016
Release Date:2022/12/08
Volume:133
Issue:June
First Page:354
Last Page:366
Institutes:Fakultät Maschinenbau
Publication:Externe Publikationen
research focus:Digitalisierung
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG