Revealing Cross-Frequency Causal Interactions During a Mental Arithmetic Task Through Symbolic Transfer Entropy: A Novel Vector-Quantization Approach

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
Stavros I DimitriadisAnastasios Bezerianos

Abstract

Working memory (WM) is a distributed cognitive process that employs communication between prefrontal cortex and posterior brain regions in the form of cross-frequency coupling between theta ( θ) and high-alpha ( α2) brain waves. A novel method for deriving causal interactions between brain waves of different frequencies is essential for a better understanding of the neural dynamics of such complex cognitive process. Here, we proposed a novel method to estimate transfer entropy ( TE) through a symbolization scheme, which is based on neural-gas algorithm (NG) and encodes a bivariate time series in the form of two symbolic sequences. Given the symbolic sequences, the delay symbolic transfer entropy ( dSTE(NG)) is defined. Our approach is akin to standard symbolic transfer entropy ( STE) that incorporates the ordinal pattern (OP) symbolization technique. We assessed the proposed method in a WM-invoked paradigm that included a mental arithmetic task at various levels of difficulty. Effective interactions between Frontal(θ) ( F(θ) ) and [Formula: see text] ( PO(α2)) brain waves were detected in multichannel EEG recordings from 16 subjects. Compared with conventional methods, our technique was less sensitive to noise and demonstrated ...Continue Reading

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Citations

Sep 30, 2016·Frontiers in Human Neuroscience·Stavros I DimitriadisAnastasios Bezerianos
Feb 26, 2016·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Marios AntonakakisAndrew C Papanicolaou
Sep 28, 2018·Journal of Neuroscience Research·Stavros I Dimitriadis
Dec 19, 2019·Frontiers in Neuroscience·Ivan De La Pava PancheAlvaro Orozco-Gutierrez
Oct 27, 2017·Alzheimer's & Dementia : Translational Research & Clinical Interventions·Stavros I DimitriadisElgar Fleisch
May 17, 2019·Journal of Neural Engineering·K GeorgiadisI Kompatsiaris
Aug 22, 2018·Frontiers in Neuroscience·Stavros I DimitriadisKrish D Singh
Sep 16, 2017·Frontiers in Human Neuroscience·Marios AntonakakisGeorge Zouridakis
Oct 31, 2018·Journal of Neuroengineering and Rehabilitation·Kostas GeorgiadisIoannis Kompatsiaris
Aug 18, 2020·Progress in Neuro-psychopharmacology & Biological Psychiatry·Stavros I Dimitriadis

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