Limits...
Influence of motor imagination on cortical activation during functional electrical stimulation.

Reynolds C, Osuagwu BA, Vuckovic A - Clin Neurophysiol (2014)

Bottom Line: Event related synchronisation/desynchronisation (ERS/ERD) over the sensory-motor cortex was analysed and compared in three paradigms: MI before FES, MI before and during FES and FES alone activated automatically.When MI only preceded FES it resulted in a weaker beta ERD during FES than when FES was activated automatically.The study is relevant for neurorehabilitation of movement.

View Article: PubMed Central - PubMed

Affiliation: Biomedical Engineering, School of Engineering, University of Glasgow, James Watt Building (South), G12 8QQ Glasgow, UK. Electronic address: clare_t_reynolds@hotmail.com.

Show MeSH

Related in: MedlinePlus

Averaged EEG in time domain. Columns correspond to different conditions while rows correspond to different electrode location. Time scale corresponds to the time scale in Figs. 3–5.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4493293&req=5

f0030: Averaged EEG in time domain. Columns correspond to different conditions while rows correspond to different electrode location. Time scale corresponds to the time scale in Figs. 3–5.

Mentions: To check whether this short lasting increase in power corresponds to ERS or to an Event Related Potential (ERP) component evoked by switching FES on and off, a post hoc time domain analysis was performed by averaging EEG signal across trials (Fig. 6). Although this averaging cannot provide a proper quantitative ERP analysis because the signal was high-pass filtered at 5 Hz during EEG recording and is quite noisy due to the insufficient number of trials, it can provide a qualitative comparison between ERP and ERS/ERD. It can be noticed that a positive peak at about t = 7500 ms corresponds to a power increase in ERS/ERD maps upon switching FES off (Figs. 3–5). The peak is most prominent at C3. Another much less prominent positive peak, most consistently noticeable in condition 1 over all three electrodes, can be noticed at about t = 3500 ms corresponding to ERS visible upon switching FES on (Figs. 3–5). This indicates that a short lasting increase in power that appears in the theta band in ERS/ERD maps is actually a phase-locked ERP component, which is not frequency specific.


Influence of motor imagination on cortical activation during functional electrical stimulation.

Reynolds C, Osuagwu BA, Vuckovic A - Clin Neurophysiol (2014)

Averaged EEG in time domain. Columns correspond to different conditions while rows correspond to different electrode location. Time scale corresponds to the time scale in Figs. 3–5.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493293&req=5

f0030: Averaged EEG in time domain. Columns correspond to different conditions while rows correspond to different electrode location. Time scale corresponds to the time scale in Figs. 3–5.
Mentions: To check whether this short lasting increase in power corresponds to ERS or to an Event Related Potential (ERP) component evoked by switching FES on and off, a post hoc time domain analysis was performed by averaging EEG signal across trials (Fig. 6). Although this averaging cannot provide a proper quantitative ERP analysis because the signal was high-pass filtered at 5 Hz during EEG recording and is quite noisy due to the insufficient number of trials, it can provide a qualitative comparison between ERP and ERS/ERD. It can be noticed that a positive peak at about t = 7500 ms corresponds to a power increase in ERS/ERD maps upon switching FES off (Figs. 3–5). The peak is most prominent at C3. Another much less prominent positive peak, most consistently noticeable in condition 1 over all three electrodes, can be noticed at about t = 3500 ms corresponding to ERS visible upon switching FES on (Figs. 3–5). This indicates that a short lasting increase in power that appears in the theta band in ERS/ERD maps is actually a phase-locked ERP component, which is not frequency specific.

Bottom Line: Event related synchronisation/desynchronisation (ERS/ERD) over the sensory-motor cortex was analysed and compared in three paradigms: MI before FES, MI before and during FES and FES alone activated automatically.When MI only preceded FES it resulted in a weaker beta ERD during FES than when FES was activated automatically.The study is relevant for neurorehabilitation of movement.

View Article: PubMed Central - PubMed

Affiliation: Biomedical Engineering, School of Engineering, University of Glasgow, James Watt Building (South), G12 8QQ Glasgow, UK. Electronic address: clare_t_reynolds@hotmail.com.

Show MeSH
Related in: MedlinePlus