Beta electroencephalograph changes during passive movements: sensory afferences contribute to beta event-related desynchronization in humans
Alegre M., Labarga A., Gurtubay I.G., Iriarte J., Malanda A., Artieda J.
Neurophysiology Section, Department of Neurology, Clínica Universitaria de Navarra, Pío XII 36, 31008, Pamplona, Spain.
Non-phase-locked beta oscillatory changes during passive movements were studied in six healthy volunteers, and compared with those observed in a similar group during ballistic movements. Passive movements consisted of brisk wrist extensions done with the help of a pulley system.
Changes in the beta band were determined by means of wavelet and Gabor transforms, and compared statistically with a pre-movement period. In this paradigm, a marked beta energy loss (event-related desynchronization, ERD) was present after the beginning of the movement, followed by a beta energy increase (event-related synchronization, ERS). The ERD/ERS was similar to that observed during ballistic movements, but without pre-movement components.
Although both changes were maximal in the contralateral central electrode, the beta ERD showed a more bilateral topography. These findings suggest that afferent proprioceptive inputs may play a role in the final part of the beta ERD observed during voluntary movements.
CITATION Neurosci Lett. 2002 Oct 4;331(1):29-32