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Task-related differential dynamics of EEG alpha- and beta-band synchronization in cortico-basal motor structures

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Citation

Klostermann, F., Nikulin, V. V., Kühn, A. A., Marzinzik, F., Wahl, M., Pogosyan, A., et al. (2007). Task-related differential dynamics of EEG alpha- and beta-band synchronization in cortico-basal motor structures. European Journal of Neuroscience, 25(5), 1604-1615. doi:10.1111/j.1460-9568.2007.05417.x.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-417B-D
Abstract
Movement-related processing results in the modulation of neuronal synchronization over several electroencephalography (EEG) frequency ranges, including alpha- (8–12 Hz) and beta-band (14–30 Hz). Whether modulation patterns differ across sites within the motor system remains unclear, but could denote how information is conveyed across the cortico-basal network. We therefore compared the event-related synchronization/desynchronization (ERS/ERD) in recordings from the scalp, basal ganglia and thalamic structures during a motor task. Simultaneous depth and scalp EEG were recorded in 13 patients, undergoing deep brain stimulation of the thalamic ventral intermediate nucleus (VIM) or the subthalamic nucleus (STN). They performed a choice-reaction task with pre-cued Go-signals, instructive for either left- or right-sided button presses. In the beta-band, pre-cues and Go-signals were followed by ERD starting well before and peaking at task execution, uniformly in all cortical and subcortical recordings. In contrast, a comparable alpha-band ERD was only seen at the scalp, whereas mirror-like ERS were observed in the motor-inhibitory STN. In VIM, which receives strong somatosensory afferences, a major alpha-ERD upon the Go-signal did not start until the motor response. These dissociations of task-related Alpha- and Beta-band dynamics tag a functional diversity in cortico-basal networks, which are simultaneously active in motor processing. Whereas the uniform downregulation of Beta-activity points to an anti-kinetic operation mode throughout the motor system, site-dependent courses of Alpha-synchronization rather reflect the coordination of activity levels in functionally divergent motor structures during the preparation and execution of movements.