Abstract
Understanding the functional organization and execution mechanisms of the brain is one of the key challenges of neuroscience. Functional connectivity emerging from phase synchronization of neural oscillations of different brain regions provides a powerful tool for investigations. While the brain manifests highly dynamic activation patterns, most connectivity work is based on the assumption of signal stationarity. One of the underlying reasons is the problem of obtaining high temporal and spectral resolution at the same time. Dynamic brain connectivity seeks to uncover the dynamism of brain connectivity but the common sliding window methods provide poor temporal resolution, not detailed enough for studying fast cognitive tasks. This paper proposes the use of the Complete Ensemble Empirical Mode Decomposition followed by Hilbert transformation to extract instantaneous frequency and phase information, based on which the phase synchronization between EEG signals can be calculated and detected in every time step of the measurement. The paper demonstrates the suboptimal performance of the sliding window connectivity method and shows that the instantaneous phase based technique is superior to it, capable of tracking changes of connectivity graphs at millisecond steps and detecting the exact time of the activity changes within a ten millisecond margin. These results can open up new opportunities in investigating neurodegenerative diseases, brain plasticity after stroke and understanding the execution of cognitive tasks.
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This work has been supported jointly by the Hungarian Government and the European Social Fund (grant number EFOP-3.6.1-16-2016-00015).
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Issa, M.F., Kozmann, G., Juhasz, Z. (2021). Increasing the Temporal Resolution of Dynamic Functional Connectivity with Ensemble Empirical Mode Decomposition. In: Jarm, T., Cvetkoska, A., Mahnič-Kalamiza, S., Miklavcic, D. (eds) 8th European Medical and Biological Engineering Conference. EMBEC 2020. IFMBE Proceedings, vol 80. Springer, Cham. https://doi.org/10.1007/978-3-030-64610-3_74
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