Comput Math Methods Med - Enhancing the signal of corticomuscular coherence.

Tópicos

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Resumo

The availability of multichannel neuroimaging techniques, such as MEG and EEG, provides us with detailed topographical information of the recorded magnetic and electric signals and therefore gives us a good overview on the concomitant signals generated in the brain. To assess the location and the temporal dynamics of neuronal sources with noninvasive recordings, reconstruction tools such as beamformers have been shown to be useful. In the current study, we are in particular interested in cortical motor control involved in the isometric contraction of finger muscles. To this end we are measuring the interaction between the dynamics of brain signals and the electrical activity of hand muscles. We were interested to find out whether in addition to the well-known correlated activity between contralateral primary motor cortex and the hand muscles, additional functional connections can be demonstrated. We adopted coherence as a functional index and propose a so-called nulling beamformer method which is computationally efficient and addresses the localization of multiple correlated sources. In simulations of cortico-motor coherence, the proposed method was able to correctly localize secondary sources. The application of the approach on real electromyographic and magnetoencephalographic data collected during an isometric contraction and rest revealed an additional activity in the hemisphere ipsilateral to the hand involved in the task.

Resumo Limpo

avail multichannel neuroimag techniqu meg eeg provid us detail topograph inform record magnet electr signal therefor give us good overview concomit signal generat brain assess locat tempor dynam neuron sourc noninvas record reconstruct tool beamform shown use current studi particular interest cortic motor control involv isometr contract finger muscl end measur interact dynam brain signal electr activ hand muscl interest find whether addit wellknown correl activ contralater primari motor cortex hand muscl addit function connect can demonstr adopt coher function index propos socal null beamform method comput effici address local multipl correl sourc simul corticomotor coher propos method abl correct local secondari sourc applic approach real electromyograph magnetoencephalograph data collect isometr contract rest reveal addit activ hemispher ipsilater hand involv task

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