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  Power-law dynamics in cortical excitability as probed by early somatosensory evoked responses

Stephani, T., Waterstraat, G., Haufe, S., Curio, G., Villringer, A., & Nikulin, V. V. (2019). Power-law dynamics in cortical excitability as probed by early somatosensory evoked responses. bioRxiv. doi:10.1101/809285.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-F0C4-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-F0CC-7
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Stephani, Tilman1, 2, Author              
Waterstraat, Gunnar3, Author
Haufe, Stefan4, Author
Curio, Gabriel3, 5, Author
Villringer, Arno1, 6, Author              
Nikulin, Vadim V.1, 7, Author              
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
2International Max Planck Research School NeuroCom, Leipzig, Germany, ou_persistent22              
3Neurophysics Group, Department of Neurology, Charité – Universitätsmedizin Berlin, Berlin, Germany, ou_persistent22              
4Berlin Center for Advanced Neuroimaging, Charité – Universitätsmedizin Berlin, Berlin, Germany, ou_persistent22              
5Bernstein Center for Computational Neuroscience, Berlin, Germany, ou_persistent22              
6MindBrainBody Institute, Berlin School of Mind and Brain, Humboldt University Berlin, Berlin, Germany, ou_persistent22              
7Center for Cognition and Decision Making, National Research University Higher School of Economics, Moscow, Russian Federation, ou_persistent22              

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 Abstract: While it is well-established that instantaneous changes in neuronal networks’ states lead to variability in brain responses and behavior, the mechanisms causing this variability are poorly understood. Insights into the organization of underlying system dynamics may be gained by examining the temporal structure of network state fluctuations, such as reflected in instantaneous cortical excitability. Using the early part of single-trial somatosensory evoked potentials in the human EEG, we non-invasively tracked the magnitude of excitatory post-synaptic potentials in the primary somatosensory cortex (BA 3b) in response to median nerve stimulation. Fluctuations in cortical excitability demonstrated long-range temporal dependencies decaying according to a power-law across trials. As these dynamics covaried with pre-stimulus alpha oscillations, we establish a functional link between ongoing and evoked activity and argue that the co-emergence of similar temporal power-laws may originate from neuronal networks poised close to a critical state, representing a parsimonious organizing principle of neural variability.

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Language(s): eng - English
 Dates: 2019-102019-10-17
 Publication Status: Published online
 Pages: -
 Publishing info: bioRxiv
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 Rev. Method: No review
 Identifiers: DOI: 10.1101/809285
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Title: bioRxiv
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