|Reference code: ||PT/FB/BL-1998-030.09|
|Location: ||Arquivo PCA - Pasta 9/1998|
|Caracterização neurofisiológica e psicofisiológica de disfunções cerebrais utilizando estudos qEEG/ERP. Metodologia e Aplicações - Patterns of ERD/ERS in simple motor tasks|
|Publication year: ||2006|
To study spatiotemporal changes of the EEG patterns induced by simple motor tasks in healthy voluntaries using event-related desynchronization/synchronization measurements. Results will be used to define normal response patterns and subsequently to study the importance of the variations that may occur in patients.
Healthy subjects were studied by recording EEG signal at rest and when executing a sequence of simple voluntary movements - brisk right thumb in three different conditions: i) self-paced movement - subject executes movements on every x seconds counted by himself; ii) random time acoustic command stimulus - movements are executed at random time intervals; iii) fixed time acoustic command stimulus - movements are executed at fixed time intervals. Each movement was repeated 60 times with a minimum interval between trials of 8 to 10 seconds. EEG was recorded from 30 electrodes according to the International System 10-20. Data sampling rate was 128 Hz, processed with the specific software (Brain Vision ®) for signal analysis. Epochs comprised 3 sec. preceding and 2 sec. following motor task execution. Artefacts were manually rejected.
In self-paced and before movement a contra-lateral dominant ERD on EEG alfa band, recorded on C3 was found, followed by a bilateral ERD on Cz and C4 which remained during movement. ERD had an earlier onset and was more pronounced in alpha band than beta. For self-paced movements and movements preceded by a random acoustic stimulus ERD was more prominent than for fixed time related movements. For movements preceded by an acoustic stimulus in fixed time intervals, ERD just appears in the beginning of the movement.
We identify EEG modifications before, during and after movement execution. The contra lateral ERD followed by bilateral ERD in self-paced and in random time acoustic movements was not evident when acoustic stimuli were elicited at fixed time intervals.
|Accessibility: ||Document does not exist in file|
|Martins da Silva, A.|
|Secondary author(s): |
|Mendonça, D., Lopes, J., Andrade, M., Ramalheira, J., Cunha, J., Silva, M. O., Temudo, T., Gomes, Ó., Alves, Ó.|
|Document type: |
|Number of reproductions: |
|Martins da Silva, A., Mendonça, D., Lopes, J., Andrade, M., Ramalheira, J., Cunha, J., Silva, M. O., Temudo, T., Gomes, Ó., & Alves, Ó. Caracterização neurofisiológica e psicofisiológica de disfunções cerebrais utilizando estudos qEEG/ERP. Metodologia e Aplicações - Patterns of ERD/ERS in simple motor tasks. In Aquém e além do cérebro. Behind and beyond the brain. Proceedings of the 6th Symposium of Fundação Bial (p. 227). Porto: Fundação Bial.|
|Indexed document: ||No|
|Keywords: ||Psychophysiology / Electroencephalogram (EEG) / Motor tasks|
Patterns of ERD/ERS in simple motor tasks