Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/109225
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Type: Journal article
Title: Investigating the impact of feedback update interval on the efficacy of restorative brain-computer interfaces
Author: Darvishi, S.
Ridding, M.
Hordacre, B.
Abbott, D.
Baumert, M.
Citation: Royal Society Open Science, 2017; 4(8):170660-1-170660-11
Publisher: Royal Society
Issue Date: 2017
ISSN: 2054-5703
2054-5703
Statement of
Responsibility: 
Sam Darvishi, Michael C. Ridding, Brenton Hordacre, Derek Abbott and Mathias Baumert
Abstract: Restorative brain-computer interfaces (BCIs) have been proposed to enhance stroke rehabilitation. Restorative BCIs are able to close the sensorimotor loop by rewarding motor imagery (MI) with sensory feedback. Despite the promising results from early studies, reaching clinically significant outcomes in a timely fashion is yet to be achieved. This lack of efficacy may be due to suboptimal feedback provision. To the best of our knowledge, the optimal feedback update interval (FUI) during MI remains unexplored. There is evidence that sensory feedback disinhibits the motor cortex. Thus, in this study, we explore how shorter than usual FUIs affect behavioural and neurophysiological measures following BCI training for stroke patients using a single-case proof-of-principle study design. The action research arm test was used as the primary behavioural measure and showed a clinically significant increase (36%) over the course of training. The neurophysiological measures including motor evoked potentials and maximum voluntary contraction showed distinctive changes in early and late phases of BCI training. Thus, this preliminary study may pave the way for running larger studies to further investigate the effect of FUI magnitude on the efficacy of restorative BCIs. It may also elucidate the role of early and late phases of motor learning along the course of BCI training.
Keywords: Brain-computer interface; brain-machine interface; feedback; feedback update interval; rehabilitation; stroke
Rights: © 2017 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
RMID: 0030075285
DOI: 10.1098/rsos.170660
Grant ID: http://purl.org/au-research/grants/nhmrc/1125054
http://purl.org/au-research/grants/arc/FT120100351
Appears in Collections:Medicine publications

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