Influence of motor imagination on cortical activation during functional electrical stimulation.
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.
Affiliation: Biomedical Engineering, School of Engineering, University of Glasgow, James Watt Building (South), G12 8QQ Glasgow, UK. Electronic address: email@example.com.Show MeSH
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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.
Affiliation: Biomedical Engineering, School of Engineering, University of Glasgow, James Watt Building (South), G12 8QQ Glasgow, UK. Electronic address: firstname.lastname@example.org.