SLOMOCO-derived slicewise head motion produces physiologic signals and reveals that motion is hard to characterize

Head motion is a major confound in BOLD imaging. Until very recently, it was only possible to use volumetric motion parameters. Hence, the distribution of typical head motion and the frequency spectrum at the slice level are unknown. We investigate these and find that while these are different, its not unexpected given the different frequency with which each measure is operating. However, we also find clear physiologic noise signatures and demonstrate that SLOMOCO can be used to obtain pulse and respiration traces.

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