Results 221 to 230 of about 11,468 (258)

Partial directed coherence analysis of intracranial neural spikes in epilepsy patients

2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2012
Intracranial electroencephalograms (EEG) provide a direct observation of neural activity by placing an electrode array on the cortical surface near the suspected epileptic foci. The neural spikes appeared during inter-ictal stages are mainly produced by abnormal neural discharges from epileptic foci.
Hsiao-Lung, Chan, Yu-Tai, Tsai, Yao-Chung, Wang, Ju-His, Ju, Bao-Luen, Chang, Tony, Wu, Shih-Tseng, Lee, Bor-Shyh, Lin   +7 more
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Partial directed coherence based graph convolutional neural networks for driving fatigue detection

Review of Scientific Instruments, 2020
The mental state of a driver can be accurately and reliably evaluated by detecting the driver’s electroencephalogram (EEG) signals. However, traditional machine learning and deep learning methods focus on the single electrode feature analysis and ignore the functional connection of the brain.
Weiwei Zhang, Fei Wang, Shichao Wu, Zongfeng Xu, Jingyu Ping, Yang Jiang   +5 more
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Lp (p ≤ 1) Norm Partial Directed Coherence for Directed Network Analysis of Scalp EEGs

Brain Topography, 2018
Partial directed coherence (PDC), which is capable of estimating directed brain networks in the frequency domain, has been widely used in various physiological recordings such as electroencephalograms (EEGs) and functional magnetic resonance imaging. However, clinical data from EEGs are inevitably contaminated with unexpected outlier artifacts.
Peiyang Li, Xiaoye Huang, Xuyang Zhu, Huan Liu, Weiwei Zhou, Dezhong Yao, Peng Xu   +6 more
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Assessing the strength of directed influences among neural signals using renormalized partial directed coherence

Journal of Neuroscience Methods, 2009
Partial directed coherence is a powerful tool used to analyze interdependencies in multivariate systems based on vector autoregressive modeling. This frequency domain measure for Granger-causality is designed such that it is normalized to [0,1]. This normalization induces several pitfalls for the interpretability of the ordinary partial directed ...
Schelter, Björn, Timmer, Jens, Eichler, Michael   +2 more
openaire   +4 more sources

Analyzing epileptic network dynamics via time-variant partial directed coherence

2016 IEEE International Conference on Bioinformatics and Biomedicine (BIBM), 2016
Epilepsy is growingly considered as a brain network disorder. In this study, epileptiform discharges were induced by low-Mg2+ in mouse entorhinal cortex-hippocampal slices, and recorded with a micro-electrode array. Dynamic effective network connectivity was constructed by calculating the time-variant partial directed coherence (tvPDC) of signals.
Bo-Wen Liu, Jun-Wei Mao, Ye-Jun Shi, Qin-Chi Lu, Pei-Ji Liang, Pu-Ming Zhang   +5 more
openaire   +1 more source

Kernel-nonlinear-PDC extends Partial Directed Coherence to detecting nonlinear causal coupling

2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2015
Here we investigate a new concept, kernel-nonlinear-Partial Directed Coherence, whereby a kernel feature space representation of the data allows detecting nonlinear causal links that are otherwise undetectable through linear modeling. We show that adequate connectivity detection is achievable by applying asympotic decision criteria similar to the ones ...
Lucas, Massaroppe, Luiz A, Baccala
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Statistically significant time-varying neural connectivity estimation using generalized partial directed coherence

2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2016
This paper illustrates the effectiveness of generalized partial directed coherence (gPDC) in characterizing time-varying neural connectivity by properly extrapolating its single trial asymptotic statistical results to a multi trial setting. Time-varying estimation is performed with a sliding-window procedure based on the proposal in [1], whereby a time-
Coelho Rodrigues, Pedro Luiz, A. Baccala, Luiz   +1 more
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Topographical assessment of neurocortical connectivity by using directed transfer function and partial directed coherence during meditation

Cognitive Processing, 2018
Due to the presence of nonlinearity and volume conduction in electroencephalography (EEG), sometimes it's challenging to find out the actual brain network from neurodynamical alteration. In this paper, two well-known time-frequency brain connectivity measures, namely partial directed coherence (PDC) and directed transfer function (DTF), have been ...
Laxmi Shaw, Aurobinda Routray
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Partially coherent sources which give rise to highly directional light beams

Optics Communications, 1978
Abstract A type of source recently discussed by Collett and Wolf is nearly spatially incoherent and yet gives a field as directional as a laser beam. It is shown that such a source could be obtained by a suitable superposition of independent laser beams.
F. Gori, C. Palma
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Correntropy-based partial directed coherence for testing multivariate Granger causality in nonlinear processes

Physical Review E, 2014
Identification of directional influences in multivariate systems is of prime importance in several applications of engineering and sciences such as plant topology reconstruction, fault detection and diagnosis, and neurosciences. A spectrum of related directionality measures, ranging from linear measures such as partial directed coherence (PDC) to ...
Rohit, Kannan, Arun K, Tangirala
openaire   +2 more sources