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Dynamic synchronization between multiple cortical motor areas and muscle activity in phasic voluntary movements.
Feige B, Aertsen A, Kristeva-Feige R.
Psychiatric Clinic, Germany.
study the functional role of synchronized neuronal activity in the
human motor system, we simultaneously recorded cortical activity by
high-resolution electroencephalography (EEG) and electromyographic
(EMG) activity of the activated muscle during a phasic voluntary
movement in seven healthy subjects. Here, we present evidence for
dynamic beta-range (16-28 Hz) synchronization between cortical activity
and muscle activity, starting after termination of the movement. In the
same time range, increased tonic activity in the activated muscle was
found. During the movement execution a low-frequency (2-14 Hz)
synchronization was found. Using a novel analysis, phase-reference
analysis, we were able to extract the EMG-coherent EEG maps for both,
low- and high-frequency beta range synchronization. The electrical
source reconstruction of the EMG-coherent EEG maps was performed with
respect to the individual brain morphology from magnetic resonance
imaging (MRI) using a distributed source model (cortical current
density analysis) and a realistic head model. The generators of the
beta-range synchronization were not only located in the primary motor
area, but also in premotor areas. The generators of the low-frequency
synchronization were also located in the primary motor and in premotor
areas, but with additional participation of the medial premotor area.
These findings suggest that the dynamic beta-range synchronization
between multiple cortical areas and activated muscles reflects the
transition of the collective motor network into a new equilibrium
state, possibly related to higher demands on attention, while the
low-frequency synchronization is related to the movement execution.
PMID: 11068003 [PubMed - indexed for MEDLINE]