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Abstract #3114

The helium Pump artifact in simultaneous EEG-fMRI does not affect ERP signal-to-noise or topological consistency.

Johan N van der Meer 1 , Andr Pampel 2 , Jennifer R Ramautar 3 , German Gomez-Herrero 3 , Jran Lepsien 2 , Harald Mller 2 , and Martin Walter 1

1 Clinical Affective Neuroimaging Laboratory, Department of Behavioral Neurology, Leibniz Institute for Neurobiology, Magdeburg, Germany, 2 Nuclear Magnetic Resonance Unit, Max Planck institute for human cognitive and brain sciences, Leipzig, Germany, 3 Department of Sleep and Cognition, Netherlands Institute for Neuroscience, Amsterdam, Netherlands

During simultaneous EEG-fMRI measurements, investigators routinely shuts down the helium pump to avoid the pump artifact in the EEG; however, this potentially harms the scanner. In this work, we investigate if this He pump artifact is really detrimental for the EEG. We performed EEG-fMRI with a reversal checkerboard task while the He pump was off and on and compare EEG quality markers between these two conditions. We also recorded EEG outside the scanner. We found (1) the He pump did not have discernable impact on EEG quality, (2) The quality during scanning is much lower during scanning as compared to outside.

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