Measuring time-varying information flow in scalp EEG signals: orthogonalized partial directed coherence

A Omidvarnia, G Azemi, B Boashash… - IEEE transactions on …, 2013 - ieeexplore.ieee.org
This study aimed to develop a time–frequency method for measuring directional interactions
over time and frequency from scalp-recorded electroencephalographic (EEG) signals in a …

Detecting causality in non-stationary time series using partial symbolic transfer entropy: Evidence in financial data

A Papana, C Kyrtsou, D Kugiumtzis, C Diks - Computational economics, 2016 - Springer
In this paper, a framework is developed for the identification of causal effects from non-
stationary time series. Focusing on causality measures that make use of delay vectors from …

Nonlinear effective connectivity measure based on adaptive Neuro Fuzzy Inference System and Granger Causality

M Farokhzadi, GA Hossein-Zadeh, H Soltanian-Zadeh - NeuroImage, 2018 - Elsevier
Exploring brain networks is an essential step towards understanding functional organization
of the brain, which needs characterization of linear and nonlinear connections based on …

Granger causality inference in EEG source connectivity analysis: a state-space approach

P Manomaisaowapak, A Nartkulpat… - IEEE Transactions on …, 2021 - ieeexplore.ieee.org
This article addresses the problem of estimating brain effective connectivity from
electroencephalogram (EEG) signals using a Granger causality (GC) characterized on state …

Quantification of the effects of volume conduction on the EEG/MEG connectivity estimates: an index of sensitivity to brain interactions

A Khadem, GA Hossein-Zadeh - Physiological measurement, 2014 - iopscience.iop.org
In the context of EEG/MEG, the term'volume conduction (VC) effects' refers to the recording
of an instantaneous linear mixture of multiple brain source activities by each EEG/MEG …

Further insights on the relationship between SP500, VIX and volume: a new asymmetric causality test

C Kyrtsou, D Kugiumtzis, A Papana - The European Journal of …, 2019 - Taylor & Francis
In the aim to explore the complex relationships between S&P500, VIX and volume we
introduce a Granger causality test using the nonlinear statistic of Asymmetric Partial Transfer …

Estimation of direct nonlinear effective connectivity using information theory and multilayer perceptron

A Khadem, GA Hossein-Zadeh - Journal of neuroscience methods, 2014 - Elsevier
Background Despite the variety of effective connectivity measures, few methods can quantify
direct nonlinear causal couplings and most of them are not applicable to high-dimensional …

Long-range reduced predictive information transfers of autistic youths in EEG sensor-space during face processing

A Khadem, GA Hossein-Zadeh, A Khorrami - Brain topography, 2016 - Springer
The majority of previous functional/effective connectivity studies conducted on the autistic
patients converged to the underconnectivity theory of ASD:“long-range underconnectivity …

An asynchronous artifact-enhanced electroencephalogram based control paradigm assisted by slight facial expression

Z Lu, X Zhang, H Li, T Zhang, L Gu, Q Tao - Frontiers in Neuroscience, 2022 - frontiersin.org
In this study, an asynchronous artifact-enhanced electroencephalogram (EEG)-based
control paradigm assisted by slight-facial expressions (sFE-paradigm) was developed. The …

Orthogonalized partial directed coherence for functional connectivity analysis of newborn EEG

AH Omidvarnia, G Azemi, B Boashash… - … , ICONIP 2012, Doha …, 2012 - Springer
The aim of this study is to develop a time-frequency method and test its applicability to
investigating directional cortical connectivity in the newborn brain considering the effect of …