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Scale-free behaviour and metastable brain-state switching driven by human cognition, an empirical approach

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Abstract

We developed a framework to study brain dynamics under cognition. In particular, we investigated the spatiotemporal properties of brain state switches under cognition. The lack of electroencephalography stationarity is exploited as one of the signatures of the metastability of brain states. We correlated power law exponents in the variables that we proposed to describe brain states, and dynamical properties of non-stationarities with cognitive conditions. This framework was successfully tested with three different datasets: a working memory dataset, an Alzheimer disease dataset, and an emotions dataset. We discuss the temporal organization of switches between states, providing evidence suggesting the need to reconsider the piecewise model, in which switches appear at discrete times. Instead, we propose a more dynamically rich view, in which besides the seemingly discrete switches, switches between neighbouring states occur all the time. These micro switches are not (physical) noise, as their properties are also affected by cognition.

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Notes

  1. Neurons functionally coupled, that spike at a constant delay

  2. The EEG time series have been detrended via high pass filtering, therefore we do not estimate the mean. In addition, an ensemble of identical brains is evidently an impossibility, therefore, by taking a time window, we assume that the process generating the signal is ergodic.

  3. Instead of modelling individual neurons, the mean-field approach considers the activity of space averaged cortical patches. These models are expected to reproduce properties observed in space-averaged brain imaging techniques, such as EEG, MRI or MEG.

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Acknowledgements

This work was supported by a Consejo Nacional de Ciencia y Tecnología (Mexican government) Grant (to A.M.-S.).

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Authors and Affiliations

  1. Brain Plasticity Unit, UMR8249, CNRS, 75005, Paris, France

    Aldo Mora-Sánchez & François-Benoît Vialatte

  2. ESPCI Paris, PSL Research University, 75005, Paris, France

    Aldo Mora-Sánchez, Gérard Dreyfus & François-Benoît Vialatte

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  1. Aldo Mora-Sánchez
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  2. Gérard Dreyfus
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  3. François-Benoît Vialatte
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Correspondence to Aldo Mora-Sánchez.

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Mora-Sánchez, A., Dreyfus, G. & Vialatte, FB. Scale-free behaviour and metastable brain-state switching driven by human cognition, an empirical approach. Cogn Neurodyn 13, 437–452 (2019). https://doi.org/10.1007/s11571-019-09533-0

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  • DOI: https://doi.org/10.1007/s11571-019-09533-0

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