TMS-related evolution of brain functional networks emerging during motor imagery
Semen A. Kurkin,1,2 1 Immanuel Kant Baltic Federal University, Kaliningrad, Russia, 2 Samara State Medical University, Samara, Russia
Abstract
The analysis of network and topological properties of functional connectivities in cortical networks of the brain, reconstructed in the source space, specific for the performance of imaginary movements was carried out. Using a statistical NBS test in the first 0.5 s after the command in the theta-band, a large functional network covering many parts of the brain was revealed, in which strengths of connectivities between its nodes significantly increase in comparison with the base level. This network reflects the development of sensorimotor integration during the first 0.5 s after the command. The structure of this network indicates activation of the central executive network and the visual cortex while deactivating the brain's passive mode network. This switch is controlled by the ventral attention network. A statistical comparison of Post2 (1-3 s after the command) with baseline in the alpha and beta bands also revealed functional networks in which connectivities increase significantly. The network in the alpha-band reflects the activity of the central executive network. Also, areas of the motor and visual cortex are involved in these networks, indicating their activation due to imagination of movements, which is controlled by the central executive network.
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Semen Kurkin
Immanuel Kant Baltic Federal University
Russia
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