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Reduced sensorimotor beta dynamics could represent a “slowed movement state” in healthy individuals

View ORCID ProfileRyan B. Leriche, Nicholas Jackson, Kathryn Peterson, Zeeya Aspandiar, Vanessa Hufnagel, View ORCID ProfileNicole C. Swann
doi: https://doi.org/10.1101/2022.02.17.480936
Ryan B. Leriche
1Department of Human Physiology, University of Oregon
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Nicholas Jackson
1Department of Human Physiology, University of Oregon
2Institute for Neuroscience, University of Texas at Austin
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Kathryn Peterson
1Department of Human Physiology, University of Oregon
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Zeeya Aspandiar
1Department of Human Physiology, University of Oregon
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Vanessa Hufnagel
1Department of Human Physiology, University of Oregon
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Nicole C. Swann
1Department of Human Physiology, University of Oregon
3Center for Translational Neuroscience, University of Oregon
4Institute of Neuroscience, University of Oregon
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  • For correspondence: nswann@uoregon.edu
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Abstract

Beta oscillations (~13-30 Hz) recorded from the sensorimotor cortex have canonical amplitude changes during movement. Specifically, a movement-related beta decrease (MRBD) occurs before movement, and a post-movement beta rebound (PMBR) follows. We investigated how the MRBD and PMBR vary with movement speed. Individuals performed a task with blocks that generated longer reaction times (RTs) and shorter RTs (Slow and Fast blocks, respectively) while scalp-electroencephalography (EEG) was recorded. The timing of task events before movement was also modulated to generate blocks with certain and uncertain timing (Fixed and Varied blocks, respectively). Beta modulation was reduced in Slow blocks compared to Fast blocks (i.e., a less negative MRBD and less positive PMBR). For the movement certainty manipulation, we saw mixed behavioral and EEG results. Our primary findings align with previous work which has shown reduced movement-related beta modulation in patients with Parkinson’s disease. We propose that a “slowed movement state”, whether it is experimentally induced or a manifestation of Parkinson’s disease bradykinesia, is represented through reduced beta dynamics. Altogether, the MRBD and PMBR may represent motor speed on a continuum with Parkinson’s disease as an extreme example of slowed movement.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted February 20, 2022.
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Reduced sensorimotor beta dynamics could represent a “slowed movement state” in healthy individuals
Ryan B. Leriche, Nicholas Jackson, Kathryn Peterson, Zeeya Aspandiar, Vanessa Hufnagel, Nicole C. Swann
bioRxiv 2022.02.17.480936; doi: https://doi.org/10.1101/2022.02.17.480936
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Reduced sensorimotor beta dynamics could represent a “slowed movement state” in healthy individuals
Ryan B. Leriche, Nicholas Jackson, Kathryn Peterson, Zeeya Aspandiar, Vanessa Hufnagel, Nicole C. Swann
bioRxiv 2022.02.17.480936; doi: https://doi.org/10.1101/2022.02.17.480936

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