Fellner, M-C. and Volberg, G. and Mullinger, K. J. and Goldhacker, M. and Wimber, M. and Greenlee, M. W. and Hanslmayr, S. (2016) Spurious correlations in simultaneous EEG-fMRI driven by in-scanner movement. NEUROIMAGE, 133. pp. 354-366. ISSN 1053-8119, 1095-9572
Full text not available from this repository. (Request a copy)Abstract
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 theMR 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 (similar to 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. (C) 2016 Elsevier Inc. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DEFAULT-MODE NETWORK; RESTING-STATE FMRI; EVENT-RELATED POTENTIALS; BOLD SIGNAL; SIMULTANEOUS EEG/FMRI; PULSE ARTIFACT; ALPHA-RHYTHM; BALLISTOCARDIOGRAM ARTIFACT; SPONTANEOUS FLUCTUATIONS; BRAIN OSCILLATIONS; EEG-BOLD correlations; Motion artifacts; Simultaneous EEG-fMRI; Theta oscillations; Subsequent memory effect |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Psychology and Pedagogy > Institut für Psychologie Psychology and Pedagogy > Institut für Psychologie > Lehrstuhl für Psychologie I (Allgemeine Psychologie I und Methodenlehre) - Prof. Dr. Mark W. Greenlee |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Mar 2019 13:12 |
| Last Modified: | 15 Mar 2019 08:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2881 |
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