András Eke
YOU?
Author Swipe
View article: Fingerprints of decreased cognitive performance on fractal connectivity dynamics in healthy aging
Fingerprints of decreased cognitive performance on fractal connectivity dynamics in healthy aging Open
Analysis of brain functional connectivity (FC) could provide insight in how and why cognitive functions decline even in healthy aging (HA). Despite FC being established as fluctuating over time even in the resting state (RS), dynamic funct…
View article: Resting-state fractal brain connectivity is associated with impaired cognitive performance in healthy aging
Resting-state fractal brain connectivity is associated with impaired cognitive performance in healthy aging Open
Aging affects cognitive functions even in the absence of ongoing pathologies. The neurophysiological basis of age-related cognitive decline (CD), however, is not completely understood. Alterations in both functional brain connectivity and …
View article: Scale-Free Functional Brain Networks Exhibit Increased Connectivity, Are More Integrated and Less Segregated in Patients with Parkinson’s Disease following Dopaminergic Treatment
Scale-Free Functional Brain Networks Exhibit Increased Connectivity, Are More Integrated and Less Segregated in Patients with Parkinson’s Disease following Dopaminergic Treatment Open
Dopaminergic treatment (DT), the standard therapy for Parkinson’s disease (PD), alters the dynamics of functional brain networks at specific time scales. Here, we explore the scale-free functional connectivity (FC) in the PD population and…
View article: Real-Time Algorithm for Detrended Cross-Correlation Analysis of Long-Range Coupled Processes
Real-Time Algorithm for Detrended Cross-Correlation Analysis of Long-Range Coupled Processes Open
Assessing power-law cross-correlations between a pair – or among a set – of processes is of great significance in diverse fields of analyses ranging from neuroscience to financial markets. In most cases such analyses are computationally ex…
View article: Multiple-Resampling Cross-Spectral Analysis: An Unbiased Tool for Estimating Fractal Connectivity With an Application to Neurophysiological Signals
Multiple-Resampling Cross-Spectral Analysis: An Unbiased Tool for Estimating Fractal Connectivity With an Application to Neurophysiological Signals Open
Investigating scale-free (i.e., fractal) functional connectivity in the brain has recently attracted increasing attention. Although numerous methods have been developed to assess the fractal nature of functional coupling, these typically i…
View article: Multifractal Functional Connectivity Analysis of Electroencephalogram Reveals Reorganization of Brain Networks in a Visual Pattern Recognition Paradigm
Multifractal Functional Connectivity Analysis of Electroencephalogram Reveals Reorganization of Brain Networks in a Visual Pattern Recognition Paradigm Open
The human brain consists of anatomically distant neuronal assemblies that are interconnected via a myriad of synapses. This anatomical network provides the neurophysiological wiring framework for functional connectivity (FC), which is esse…
View article: Corrigendum: Two-Tiered Response of Cardiorespiratory-Cerebrovascular Network to Orthostatic Challenge
Corrigendum: Two-Tiered Response of Cardiorespiratory-Cerebrovascular Network to Orthostatic Challenge Open
[This corrects the article DOI: 10.3389/fphys.2021.622569.].
View article: Two-Tiered Response of Cardiorespiratory-Cerebrovascular Network to Orthostatic Challenge
Two-Tiered Response of Cardiorespiratory-Cerebrovascular Network to Orthostatic Challenge Open
Dynamic interdependencies within and between physiological systems and subsystems are key for homeostatic mechanisms to establish an optimal state of the organism. These interactions mediate regulatory responses elicited by various perturb…
View article: Scale-Free Coupled Dynamics in Brain Networks Captured by Bivariate Focus-Based Multifractal Analysis
Scale-Free Coupled Dynamics in Brain Networks Captured by Bivariate Focus-Based Multifractal Analysis Open
While most connectivity studies investigate functional connectivity (FC) in a scale-dependent manner, coupled neural processes may also exhibit broadband dynamics, manifesting as power-law scaling of their measures of interdependence. Here…
View article: Separating scale‐free and oscillatory components of neural activity in schizophrenia
Separating scale‐free and oscillatory components of neural activity in schizophrenia Open
Introduction Alterations in narrow‐band spectral power of electroencephalography (EEG) recordings are commonly reported in patients with schizophrenia (SZ). It is well established however that electrophysiological signals comprise a broadb…
View article: Decreased connection density and modularity of functional brain networks during n‐back working memory paradigm
Decreased connection density and modularity of functional brain networks during n‐back working memory paradigm Open
Introduction Investigating how the brain adapts to increased mental workload through large‐scale functional reorganization appears as an important research question. Functional connectivity (FC) aims at capturing how disparate regions of t…
View article: Multifractal and Entropy-Based Analysis of Delta Band Neural Activity Reveals Altered Functional Connectivity Dynamics in Schizophrenia
Multifractal and Entropy-Based Analysis of Delta Band Neural Activity Reveals Altered Functional Connectivity Dynamics in Schizophrenia Open
Dynamic functional connectivity (DFC) was established in the past decade as a potent approach to reveal non-trivial, time-varying properties of neural interactions - such as their multifractality or information content -, that otherwise re…
View article: Editorial: Fractal and Multifractal Facets in the Structure and Dynamics of Physiological Systems and Applications to Homeostatic Control, Disease Diagnosis and Integrated Cyber-Physical Platforms
Editorial: Fractal and Multifractal Facets in the Structure and Dynamics of Physiological Systems and Applications to Homeostatic Control, Disease Diagnosis and Integrated Cyber-Physical Platforms Open
EDITORIAL article Front. Physiol., 13 May 2020Sec. Fractal Physiology Volume 11 - 2020 | https://doi.org/10.3389/fphys.2020.00447
View article: Model-based evaluation of the microhemodynamic effects of PEGylated HBOC molecules in the rat brain cortex: a laser speckle imaging study
Model-based evaluation of the microhemodynamic effects of PEGylated HBOC molecules in the rat brain cortex: a laser speckle imaging study Open
Hemoglobin-based oxygen carriers (HBOCs) were developed with the aim of substituting transfusions in emergency events. However, they exhibit adverse events, such as nitric oxide (NO) scavenging, vasoactivity, enhanced platelet aggregation,…
View article: Multifractal and entropy analysis of resting-state electroencephalography reveals spatial organization in local dynamic functional connectivity
Multifractal and entropy analysis of resting-state electroencephalography reveals spatial organization in local dynamic functional connectivity Open
Functional connectivity of the brain fluctuates even in resting-state condition. It has been reported recently that fluctuations of global functional network topology and those of individual connections between brain regions expressed mult…
View article: Multifractal Dynamic Functional Connectivity in the Resting-State Brain
Multifractal Dynamic Functional Connectivity in the Resting-State Brain Open
Assessing the functional connectivity (FC) of the brain has proven valuable in enhancing our understanding of brain function. Recent developments in the field demonstrated that FC fluctuates even in the resting state, which has not been ta…
View article: Impact of Healthy Aging on Multifractal Hemodynamic Fluctuations in the Human Prefrontal Cortex
Impact of Healthy Aging on Multifractal Hemodynamic Fluctuations in the Human Prefrontal Cortex Open
Fluctuations in resting-state cerebral hemodynamics show scale-free behavior over two distinct scaling ranges. Changes in such bimodal (multi) fractal pattern give insight to altered cerebrovascular or neural function. Our main goal was to…
View article: Decomposing Multifractal Crossovers
Decomposing Multifractal Crossovers Open
Physiological processes-such as, the brain's resting-state electrical activity or hemodynamic fluctuations-exhibit scale-free temporal structuring. However, impacts common in biological systems such as, noise, multiple signal generators, o…
View article: Increased prefrontal cortex connectivity during cognitive challenge assessed by fNIRS imaging
Increased prefrontal cortex connectivity during cognitive challenge assessed by fNIRS imaging Open
In this study, functional near-infrared spectroscopy (fNIRS) and the graph theory approach were used to access the functional connectivity (FC) of the prefrontal cortex (PFC) in a resting state and during increased mental workload. For thi…
View article: 013 Free-breathing MOCO LGE leads to better image quality and faster scanning times in clinical practice
013 Free-breathing MOCO LGE leads to better image quality and faster scanning times in clinical practice Open
Objectives Late gadolinium enhancement (LGE) sequences have evolved. Free-breathing, motion-corrected LGE (MOCO-LGE)1,2 has several potential advantages over breath held LGE (bh-LGE)3 including minimal user input for the LGE short axis (SA…