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

M-C Fellner1, G Volberg2, K J Mullinger3

  • 1Fachbereich Psychologie, Universität Konstanz, Postfach 905, 78457 Konstanz, Germany; Department of Neuropsychology, Institute of Cognitive Neuroscience, Ruhr University Bochum, 44801 Bochum, Germany.

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|March 26, 2016
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Summary
This summary is machine-generated.

Head motion in simultaneous EEG-fMRI studies creates artifactual EEG effects and correlations. Even minor movements (<0.2mm) can skew results, impacting cognitive process research.

Keywords:
EEG–BOLD correlationsMotion artifactsSimultaneous EEG-fMRISubsequent memory effectTheta oscillations

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biomedical Engineering

Background:

  • Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) offer high temporal and spatial resolution for studying cognitive processes.
  • MR scanner-induced artifacts in EEG data remain a significant challenge for accurate interpretation.

Purpose of the Study:

  • To investigate the impact of head motion, a commonly overlooked artifact source, on EEG data and EEG-BOLD correlations in simultaneous EEG-fMRI.
  • To demonstrate how minor head movements can introduce spurious findings in cognitive neuroscience research.

Main Methods:

  • Applied standard artifact correction techniques to simultaneous EEG-fMRI data.
  • Analyzed the correlation between low-frequency EEG (<20Hz) and in-scanner head motion.
  • Examined EEG-BOLD correlations in relation to motion-fMRI correlations.
  • Utilized a memory encoding experiment to illustrate the findings.

Main Results:

  • Low-frequency EEG signals (<20Hz) showed a strong correlation with in-scanner movement.
  • Minor head motion (<0.2mm) generated spurious low-frequency EEG effects and influenced EEG-BOLD correlations.
  • Observed that EEG-BOLD correlations closely mirrored motion-fMRI correlations.
  • Demonstrated that theta power effects and theta-BOLD correlations in a memory task reflected scanner motion.

Conclusions:

  • Head motion is a critical, often underestimated, source of artifacts in simultaneous EEG-fMRI studies.
  • Spurious EEG effects and correlations can arise from even subtle head movements, potentially misrepresenting cognitive processes.
  • Future EEG-fMRI research must rigorously address and account for head motion to ensure data validity.