Cargando…

Modulation of event-related desynchronization during kinematic and kinetic hand movements

BACKGROUND: Event-related desynchronization/synchronization (ERD/ERS) is a relative power decrease/increase of electroencephalogram (EEG) in a specific frequency band during physical motor execution and mental motor imagery, thus it is widely used for the brain-computer interface (BCI) purpose. Howe...

Descripción completa

Detalles Bibliográficos
Autores principales: Nakayashiki, Kosei, Saeki, Midori, Takata, Yohei, Hayashi, Yoshikatsu, Kondo, Toshiyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4077682/
https://www.ncbi.nlm.nih.gov/pubmed/24886610
http://dx.doi.org/10.1186/1743-0003-11-90
_version_ 1782323633440423936
author Nakayashiki, Kosei
Saeki, Midori
Takata, Yohei
Hayashi, Yoshikatsu
Kondo, Toshiyuki
author_facet Nakayashiki, Kosei
Saeki, Midori
Takata, Yohei
Hayashi, Yoshikatsu
Kondo, Toshiyuki
author_sort Nakayashiki, Kosei
collection PubMed
description BACKGROUND: Event-related desynchronization/synchronization (ERD/ERS) is a relative power decrease/increase of electroencephalogram (EEG) in a specific frequency band during physical motor execution and mental motor imagery, thus it is widely used for the brain-computer interface (BCI) purpose. However what the ERD really reflects and its frequency band specific role have not been agreed and are under investigation. Understanding the underlying mechanism which causes a significant ERD would be crucial to improve the reliability of the ERD-based BCI. We systematically investigated the relationship between conditions of actual repetitive hand movements and resulting ERD. METHODS: Eleven healthy young participants were asked to close/open their right hand repetitively at three different speeds (Hold, 1/3 Hz, and 1 Hz) and four distinct motor loads (0, 2, 10, and 15 kgf). In each condition, participants repeated 20 experimental trials, each of which consisted of rest (8–10 s), preparation (1 s) and task (6 s) periods. Under the Hold condition, participants were instructed to keep clenching their hand (i.e., isometric contraction) during the task period. Throughout the experiment, EEG signals were recorded from left and right motor areas for offline data analysis. We obtained time courses of EEG power spectrum to discuss the modulation of mu and beta-ERD/ERS due to the task conditions. RESULTS: We confirmed salient mu-ERD (8–13 Hz) and slightly weak beta-ERD (14–30 Hz) on both hemispheres during repetitive hand grasping movements. According to a 3 × 4 ANOVA (speed × motor load), both mu and beta-ERD during the task period were significantly weakened under the Hold condition, whereas no significant difference in the kinetics levels and interaction effect was observed. CONCLUSIONS: This study investigates the effect of changes in kinematics and kinetics on resulting ERD during repetitive hand grasping movements. The experimental results suggest that the strength of ERD may reflect the time differentiation of hand postures in motor planning process or the variation of proprioception resulting from hand movements, rather than the motor command generated in the down stream, which recruits a group of motor neurons.
format Online
Article
Text
id pubmed-4077682
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher BioMed Central
record_format MEDLINE/PubMed
spelling pubmed-40776822014-07-02 Modulation of event-related desynchronization during kinematic and kinetic hand movements Nakayashiki, Kosei Saeki, Midori Takata, Yohei Hayashi, Yoshikatsu Kondo, Toshiyuki J Neuroeng Rehabil Research BACKGROUND: Event-related desynchronization/synchronization (ERD/ERS) is a relative power decrease/increase of electroencephalogram (EEG) in a specific frequency band during physical motor execution and mental motor imagery, thus it is widely used for the brain-computer interface (BCI) purpose. However what the ERD really reflects and its frequency band specific role have not been agreed and are under investigation. Understanding the underlying mechanism which causes a significant ERD would be crucial to improve the reliability of the ERD-based BCI. We systematically investigated the relationship between conditions of actual repetitive hand movements and resulting ERD. METHODS: Eleven healthy young participants were asked to close/open their right hand repetitively at three different speeds (Hold, 1/3 Hz, and 1 Hz) and four distinct motor loads (0, 2, 10, and 15 kgf). In each condition, participants repeated 20 experimental trials, each of which consisted of rest (8–10 s), preparation (1 s) and task (6 s) periods. Under the Hold condition, participants were instructed to keep clenching their hand (i.e., isometric contraction) during the task period. Throughout the experiment, EEG signals were recorded from left and right motor areas for offline data analysis. We obtained time courses of EEG power spectrum to discuss the modulation of mu and beta-ERD/ERS due to the task conditions. RESULTS: We confirmed salient mu-ERD (8–13 Hz) and slightly weak beta-ERD (14–30 Hz) on both hemispheres during repetitive hand grasping movements. According to a 3 × 4 ANOVA (speed × motor load), both mu and beta-ERD during the task period were significantly weakened under the Hold condition, whereas no significant difference in the kinetics levels and interaction effect was observed. CONCLUSIONS: This study investigates the effect of changes in kinematics and kinetics on resulting ERD during repetitive hand grasping movements. The experimental results suggest that the strength of ERD may reflect the time differentiation of hand postures in motor planning process or the variation of proprioception resulting from hand movements, rather than the motor command generated in the down stream, which recruits a group of motor neurons. BioMed Central 2014-05-30 /pmc/articles/PMC4077682/ /pubmed/24886610 http://dx.doi.org/10.1186/1743-0003-11-90 Text en Copyright © 2014 Nakayashiki et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/4.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Nakayashiki, Kosei
Saeki, Midori
Takata, Yohei
Hayashi, Yoshikatsu
Kondo, Toshiyuki
Modulation of event-related desynchronization during kinematic and kinetic hand movements
title Modulation of event-related desynchronization during kinematic and kinetic hand movements
title_full Modulation of event-related desynchronization during kinematic and kinetic hand movements
title_fullStr Modulation of event-related desynchronization during kinematic and kinetic hand movements
title_full_unstemmed Modulation of event-related desynchronization during kinematic and kinetic hand movements
title_short Modulation of event-related desynchronization during kinematic and kinetic hand movements
title_sort modulation of event-related desynchronization during kinematic and kinetic hand movements
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4077682/
https://www.ncbi.nlm.nih.gov/pubmed/24886610
http://dx.doi.org/10.1186/1743-0003-11-90
work_keys_str_mv AT nakayashikikosei modulationofeventrelateddesynchronizationduringkinematicandkinetichandmovements
AT saekimidori modulationofeventrelateddesynchronizationduringkinematicandkinetichandmovements
AT takatayohei modulationofeventrelateddesynchronizationduringkinematicandkinetichandmovements
AT hayashiyoshikatsu modulationofeventrelateddesynchronizationduringkinematicandkinetichandmovements
AT kondotoshiyuki modulationofeventrelateddesynchronizationduringkinematicandkinetichandmovements