TMS-evoked changes in brain-state dynamics quantified by using EEG data

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Abstract

To improve our understanding of the combined transcranial magnetic stimulation (TMS) and electroencephalography (EEG) method in general, it is important to study how the dynamics of the TMS-modulated brain activity differs from the dynamics of spontaneous activity. In this paper, we introduce two quantitative measures based on EEG data, called mean state shift (MSS) and state variance (SV), for evaluating the TMS-evoked changes in the brain-state dynamics. MSS quantifies the immediate TMS-elicited change in the brain state, whereas SV shows whether the rate at which the brain state changes is modulated by TMS. We report a statistically significant increase for a period of 100–200 ms after the TMS pulse in both MSS and SV at the group level. This indicates that the TMS-modulated brain state differs from the spontaneous one. Moreover, the TMS-modulated activity is more vigorous than the natural activity.

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Original languageEnglish
Article number155
Pages (from-to)1-7
JournalFRONTIERS IN HUMAN NEUROSCIENCE
Volume7
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

    Research areas

  • TMS, EEG, state space, brain dynamics, trajectory, recurrence quantification analysis

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