keyword
MENU ▼
Read by QxMD icon Read
search

Granger causality

keyword
https://www.readbyqxmd.com/read/29235027/a-study-on-the-causal-effect-of-urban-population-growth-and-international-trade-on-environmental-pollution-evidence-from-china
#1
Kofi Baah Boamah, Jianguo Du, Angela Jacinta Boamah, Kingsley Appiah
This study seeks to contribute to the recent literature by empirically investigating the causal effect of urban population growth and international trade on environmental pollution of China, for the period 1980-2014. The Johansen cointegration confirmed a long-run cointegration association among the utilised variables for the case of China. The direction of causality among the variables was, consequently, investigated using the recent bootstrapped Granger causality test. This bootstrapped Granger causality approach is preferred as it provides robust and accurate critical values for statistical inferences...
December 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29226709/enhanced-brain-network-activity-in-complex-movement-rhythms-a-simultaneous-fmri-eeg-study
#2
Bhim Mani Adhikari, Charles M Epstein, Mukesh Dhamala
Generating movement rhythms is known to involve a network of distributed brain regions associated with motor planning, control, execution, and perception of timing for the repertoire of motor actions. What brain areas are bound in the network and how the network activity is modulated by rhythmic complexity have not been completely explored. To contribute to answering these questions, we designed a study in which nine healthy participants performed simple to complex rhythmic finger movement tasks while undergoing simultaneous functional magnetic resonance imaging and electroencephalography (fMRI-EEG) recordings of their brain activity during the tasks and rest...
December 10, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/29224721/synergistic-processing-of-visual-contours-across-cortical-layers-in-v1-and-v2
#3
Rujia Chen, Feng Wang, Hualou Liang, Wu Li
Visual cortical areas are interconnected via layer-specific feedforward and feedback projections. Such intricate connections are thought to be essential for parsing complex visual images, but the synergy among different layers in different cortical areas remains unclear. By simultaneously mapping neuronal activities across cortical depths in V1 and V2 of behaving monkeys, we identified spatiotemporally dissociable processes for grouping contour fragments and segregating background components. These processes generated and amplified contour signals within specific layers in V1 and V2...
November 17, 2017: Neuron
https://www.readbyqxmd.com/read/29211761/prophetic-granger-causality-to-infer-gene-regulatory-networks
#4
Daniel E Carlin, Evan O Paull, Kiley Graim, Christopher K Wong, Adrian Bivol, Peter Ryabinin, Kyle Ellrott, Artem Sokolov, Joshua M Stuart
We introduce a novel method called Prophetic Granger Causality (PGC) for inferring gene regulatory networks (GRNs) from protein-level time series data. The method uses an L1-penalized regression adaptation of Granger Causality to model protein levels as a function of time, stimuli, and other perturbations. When combined with a data-independent network prior, the framework outperformed all other methods submitted to the HPN-DREAM 8 breast cancer network inference challenge. Our investigations reveal that PGC provides complementary information to other approaches, raising the performance of ensemble learners, while on its own achieves moderate performance...
2017: PloS One
https://www.readbyqxmd.com/read/29204686/weather-conditions-influence-the-number-of-psychiatric-emergency-room-patients
#5
Eva Janina Brandl, Tristram A Lett, George Bakanidze, Andreas Heinz, Felix Bermpohl, Meryam Schouler-Ocak
The specific impact of weather factors on psychiatric disorders has been investigated only in few studies with inconsistent results. We hypothesized that meteorological conditions influence the number of cases presenting in a psychiatric emergency room as a measure of mental health conditions. We analyzed the number of patients consulting the emergency room (ER) of a psychiatric hospital in Berlin, Germany, between January 1, 2008, and December 31, 2014. A total of N = 22,672 cases were treated in the ER over the study period...
December 4, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29190523/electromagnetic-source-imaging-using-simultaneous-scalp-eeg-and-intracranial-eeg-an-emerging-tool-for-interacting-with-pathological-brain-networks
#6
Seyed Amir Hossein Hosseini, Abbas Sohrabpour, Bin He
OBJECTIVE: The goal of this study is to investigate the performance, merits and limitations of source imaging using intracranial EEG (iEEG) recordings and to compare its accuracy to the results of EEG source imaging. Accuracy in this study, is measured both by determining the location and inter-nodal connectivity of underlying brain networks. METHODS: Systematic computer simulation studies are conducted to evaluate iEEG-based source imaging vs. EEG-based source imaging, and source imaging using both EEG and iEEG...
November 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29183980/speaker-gaze-increases-information-coupling-between-infant-and-adult-brains
#7
Victoria Leong, Elizabeth Byrne, Kaili Clackson, Stanimira Georgieva, Sarah Lam, Sam Wass
When infants and adults communicate, they exchange social signals of availability and communicative intention such as eye gaze. Previous research indicates that when communication is successful, close temporal dependencies arise between adult speakers' and listeners' neural activity. However, it is not known whether similar neural contingencies exist within adult-infant dyads. Here, we used dual-electroencephalography to assess whether direct gaze increases neural coupling between adults and infants during screen-based and live interactions...
November 28, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29173968/causality-test-of-ambient-fine-particles-and-human-influenza-in-taiwan-age-group-specific-disparity-and-geographic-heterogeneity
#8
Cathy W S Chen, Ying-Hen Hsieh, Hung-Chieh Su, Jia Jing Wu
Influenza is a major global public health problem, with serious outcomes that can result in hospitalization or even death. We investigate the causal relationship between human influenza cases and air pollution, quantified by ambient fine particles <2.5μm in aerodynamic diameter (PM2.5). A modified Granger causality test is proposed to ascertain age group-specific causal relationship between weekly influenza cases and weekly adjusted accumulative PM2.5 from 2009 to 2015 in 11 cities and counties in Taiwan...
November 21, 2017: Environment International
https://www.readbyqxmd.com/read/29171025/25-hydroxy-vitamin-d3-serum-concentration-in-dogs-with-acute-polyradiculoneuritis-compared-to-matched-controls
#9
E J Laws, A Kathrani, T R Harcourt-Brown, N Granger, J H Rose
OBJECTIVES: To determine if dogs with acute polyradiculoneuritis have lower serum 25-hydroxy vitamin D3 concentration compared to a control group of dogs with idiopathic epilepsy. MATERIALS AND METHODS: Retrospective case-control study of 21 dogs with acute canine polyradiculoneuritis and 21 control dogs with idiopathic epilepsy matched for year and season of presentation from a referral hospital population in the UK. Serum concentration of 25-hydroxy vitamin D3 was compared between groups using Student's t-test...
November 24, 2017: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/29168017/a-comparative-study-of-the-robustness-of-frequency-domain-connectivity-measures-to-finite-data-length
#10
Sara Sommariva, Alberto Sorrentino, Michele Piana, Vittorio Pizzella, Laura Marzetti
In this work we use numerical simulation to investigate how the temporal length of the data affects the reliability of the estimates of brain connectivity from EEG time-series. We assume that the neural sources follow a stable MultiVariate AutoRegressive model, and consider three connectivity metrics: imaginary part of coherency (IC), generalized partial directed coherence (gPDC) and frequency-domain granger causality (fGC). In order to assess the statistical significance of the estimated values, we use the surrogate data test by generating phase-randomized and autoregressive surrogate data...
November 22, 2017: Brain Topography
https://www.readbyqxmd.com/read/29167736/on-the-interpretability-and-computational-reliability-of-frequency-domain-granger-causality
#11
Luca Faes, Sebastiano Stramaglia, Daniele Marinazzo
This Correspondence article is a comment which directly relates to the paper "A study of problems encountered in Granger causality analysis from a neuroscience perspective" ( Stokes and Purdon, 2017). We agree that interpretation issues of Granger causality (GC) in neuroscience exist, partially due to the historically unfortunate use of the name "causality", as described in previous literature. On the other hand, we think that Stokes and Purdon use a formulation of GC which is outdated (albeit still used) and do not fully account for the potential of the different frequency-domain versions of GC; in doing so, their paper dismisses GC measures based on a suboptimal use of them...
2017: F1000Research
https://www.readbyqxmd.com/read/29167592/using-large-scale-granger-causality-to-study-changes-in-brain-network-properties-in-the-clinically-isolated-syndrome-cis-stage-of-multiple-sclerosis
#12
Anas Z Abidin, Udaysankar Chockanathan, Adora M DSouza, Matilde Inglese, Axel Wismüller
Clinically Isolated Syndrome (CIS) is often considered to be the first neurological episode associated with Multiple sclerosis (MS). At an early stage the inflammatory demyelination occurring in the CNS can manifest as a change in neuronal metabolism, with multiple asymptomatic white matter lesions detected in clinical MRI. Such damage may induce topological changes of brain networks, which can be captured by advanced functional MRI (fMRI) analysis techniques. We test this hypothesis by capturing the effective relationships of 90 brain regions, defined in the Automated Anatomic Labeling (AAL) atlas, using a large-scale Granger Causality (lsGC) framework...
March 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/29167591/identifying-hiv-associated-neurocognitive-disorder-using-large-scale-granger-causality-analysis-on-resting-state-functional-mri
#13
Adora M DSouza, Anas Z Abidin, Lutz Leistritz, Axel Wismüller
We investigate the applicability of large-scale Granger Causality (lsGC) for extracting a measure of multivariate information flow between pairs of regional brain activities from resting-state functional MRI (fMRI) and test the effectiveness of these measures for predicting a disease state. Such pairwise multivariate measures of interaction provide high-dimensional representations of connectivity profiles for each subject and are used in a machine learning task to distinguish between healthy controls and individuals presenting with symptoms of HIV Associated Neurocognitive Disorder (HAND)...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/29165399/greenhouse-gas-emissions-energy-consumption-and-economic-growth-a-panel-cointegration-analysis-for-16-asian-countries
#14
Wen-Cheng Lu
This research investigates the co-movement and causality relationships between greenhouse gas emissions, energy consumption and economic growth for 16 Asian countries over the period 1990-2012. The empirical findings suggest that in the long run, bidirectional Granger causality between energy consumption, GDP and greenhouse gas emissions and between GDP, greenhouse gas emissions and energy consumption is established. A non-linear, quadratic relationship is revealed between greenhouse gas emissions, energy consumption and economic growth, consistent with the environmental Kuznets curve for these 16 Asian countries and a subsample of the Asian new industrial economy...
November 22, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29164109/identification-of-directed-interactions-in-kinematic-data-during-running
#15
Giovana Y Nakashima, Theresa H Nakagawa, Ana F Dos Santos, Fábio V Serrão, Michel Bessani, Carlos D Maciel
The knowledge of motion dynamics during running activity is crucial to enhance the development of rehabilitation techniques and injury prevention programs. Recent studies investigated the interaction between joints, using several analysis techniques, as cross-correlation, sensitivity analysis, among others. However, the direction of the joints pairing is still not understood. This paper proposes a study of the influence direction pattern in healthy runners by using kinematic data together with partial directed coherence, a frequency approach of Granger causality...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/29163095/the-functional-architecture-of-the-brain-underlies-strategic-deception-in-impression-management
#16
Qiang Luo, Yina Ma, Meghana A Bhatt, P Read Montague, Jianfeng Feng
Impression management, as one of the most essential skills of social function, impacts one's survival and success in human societies. However, the neural architecture underpinning this social skill remains poorly understood. By employing a two-person bargaining game, we exposed three strategies involving distinct cognitive processes for social impression management with different levels of strategic deception. We utilized a novel adaptation of Granger causality accounting for signal-dependent noise (SDN), which captured the directional connectivity underlying the impression management during the bargaining game...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29163083/effective-connectivity-analysis-of-the-brain-network-in-drivers-during-actual-driving-using-near-infrared-spectroscopy
#17
Zhian Liu, Ming Zhang, Gongcheng Xu, Congcong Huo, Qitao Tan, Zengyong Li, Quan Yuan
Driving a vehicle is a complex activity that requires high-level brain functions. This study aimed to assess the change in effective connectivity (EC) between the prefrontal cortex (PFC), motor-related areas (MA) and vision-related areas (VA) in the brain network among the resting, simple-driving and car-following states. Twelve young male right-handed adults were recruited to participate in an actual driving experiment. The brain delta [HbO2] signals were continuously recorded using functional near infrared spectroscopy (fNIRS) instruments...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29158177/granger-causal-connectivity-dissociates-navigation-networks-that-subserve-allocentric-and-egocentric-path-integration
#18
Chin-Teng Lin, Te-Cheng Chiu, Yu-Kai Wang, Chun-Hsiang Chuang, Klaus Gramann
Studies on spatial navigation demonstrate a significant role of the retrosplenial complex (RSC) in the transformation of egocentric and allocentric information into complementary spatial reference frames (SRFs). The tight anatomical connections of the RSC with a wide range of other cortical regions processing spatial information support its vital role within the human navigation network. To better understand how different areas of the navigational network interact, we investigated the dynamic causal interactions of brain regions involved in solving a virtual navigation task...
November 17, 2017: Brain Research
https://www.readbyqxmd.com/read/29149201/the-influence-of-filtering-and-downsampling-on-the-estimation-of-transfer-entropy
#19
Immo Weber, Esther Florin, Michael von Papen, Lars Timmermann
Transfer entropy (TE) provides a generalized and model-free framework to study Wiener-Granger causality between brain regions. Because of its nonparametric character, TE can infer directed information flow also from nonlinear systems. Despite its increasing number of applications in neuroscience, not much is known regarding the influence of common electrophysiological preprocessing on its estimation. We test the influence of filtering and downsampling on a recently proposed nearest neighborhood based TE estimator...
2017: PloS One
https://www.readbyqxmd.com/read/29143264/carbon-emissions-income-relationships-with-structural-breaks-the-case-of-the-middle-eastern-and-north-african-countries
#20
Ghassen El Montasser, Ahdi Noomen Ajmi, Duc Khuong Nguyen
This article revisits the carbon dioxide (CO2) emissions-GDP causal relationships in the Middle Eastern and North African (MENA) countries by employing the Rossi (Economet Theor 21:962-990, 2005) instability-robust causality test. We show evidence of significant causality relationships for all considered countries within the instability context, whereas the standard Granger causality test fails to detect causal links in any direction, except for Egypt, Iran, and Morocco. An important policy implication resulting from this robust analysis is that the income is not affected by the cuts in the CO2 emissions for only two MENA countries, the UAE and Syria...
November 15, 2017: Environmental Science and Pollution Research International
keyword
keyword
118050
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"