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Mobile EEG reveals functionally dissociable dynamic processes supporting real-world ambulatory obstacle avoidance : evidence for early proactive control

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Date
07/02/2021
Author
Mustile, Magda
Kourtis, Dimitrios
Ladouce, Simon
Learmonth, Gemma
Donaldson, David I.
Edwards, Martin G.
Ietswaart, Magdalena
Keywords
Action planning
Embodied cognition
Gait adaptation
Motor control
Walking
BF Psychology
RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
DAS
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Abstract
The ability to safely negotiate the world on foot takes humans years to develop, reflecting the huge cognitive demands associated with real‐time planning and control of walking. Despite the importance of walking, methodological limitations mean that surprisingly little is known about the neural and cognitive processes that support ambulatory motor control. Here, we report mobile EEG data recorded from thirty‐two healthy young adults during real‐world ambulatory obstacle avoidance. Participants walked along a path while stepping over expected and unexpected obstacles projected on the floor, allowing us to capture the dynamic oscillatory response to changes in environmental demands. Compared to obstacle‐free walking, time‐frequency analysis of the EEG data revealed clear frontal theta and centro‐parietal beta power neural markers of proactive and reactive forms of movement control (occurring before and after crossing an obstacle). Critically, the temporal profile of changes in frontal theta allowed us to arbitrate between early selection and late adaptation mechanisms of proactive control. Our data show that motor plans are updated as soon as an upcoming obstacle appears, rather than when the obstacle is reached. In addition, regardless of whether motor plans required updating, a clear beta rebound was present after obstacles were crossed, reflecting the resetting of the motor system. Overall, mobile EEG recorded during real‐world walking provides novel insight into the cognitive and neural basis of dynamic motor control in humans, suggesting new routes to the monitoring and rehabilitation of motor disorders such as dyspraxia and Parkinson’s disease.
Citation
Mustile , M , Kourtis , D , Ladouce , S , Learmonth , G , Donaldson , D I , Edwards , M G & Ietswaart , M 2021 , ' Mobile EEG reveals functionally dissociable dynamic processes supporting real-world ambulatory obstacle avoidance : evidence for early proactive control ' , European Journal of Neuroscience , vol. Early View . https://doi.org/10.1111/ejn.15120
Publication
European Journal of Neuroscience
Status
Peer reviewed
DOI
https://doi.org/10.1111/ejn.15120
ISSN
0953-816X
Type
Journal article
Rights
© 2021 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
This work is supported by a scholarship from the University of Stirling and a reseach grant from SINAPSE (Scottish Imaging Network: A Platform for Scientific excellence). GL is supported by the Wellcome Trust [209209/Z/17/Z].
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/23988

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