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Coherency and connectivity in oscillating neural networks: linear partialization analysis
1997
Biological cybernetics
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.; van Dijk, B.W.; Spekreijse, H.; van Leeuwen, W.A. Abstract. ...
W. van Dijk, Laboratory for Medical Physics, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands (e-mail: b.vandijk@amc.uva.nl) unit activity, multiple unit activity or electroencephalographic ...
The linear partialization method (van Dijk 1995) can subtract the influence of the correlated source from the cross-correlation functions as long as we can assume that the response to the external source ...
doi:10.1007/s004220050322
pmid:9050206
fatcat:7ttybcattray5fu3ol7n3d4gp4
Comparing average network signals and neural mass signals in systems with low-synchrony
[article]
2017
bioRxiv
pre-print
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Every neuron j is under influence of zero-centered, δ correlated, Gaussian white noise W j with unit variance, i.e. that is E[W j = 0 and E[W j (t)W j (t )] = δ jk δ(t − t ) where δ kl is the Kroneckers ...
Every neuron j is under influence of zerocentered, δ correlated, Gaussian white noise W j with unit variance, i.e. that is E[W j = 0 and E[W j (t)W j (t )] = δ jk δ(t − t ) where δ kl is the Kroneckers ...
doi:10.1101/196113
fatcat:vazyrlsrxnc3xfgrfrvxtpzlmy
A Mapping Between Structural and Functional Brain Networks
2016
Brain Connectivity
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., 2008; van den Heuvel et al., 2009 ). ...
DenotingW: = f (K) (A), we evaluate the goodness of fit of our mappings using the Frobenius norm (Van Mieghem, 2014) . ...
doi:10.1089/brain.2015.0408
pmid:26860437
pmcid:PMC4939447
fatcat:mup5y5jfmrdihfqs354nq3chki
Nonlinear synchronization in EEG and whole-head MEG recordings of healthy subjects
2003
Human Brain Mapping
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Dijk, 2002] . ...
Synchronization likelihood The synchronization likelihood is a measure of the degree of synchronization or coupling between two or more time series [Stam and van Dijk, 2002 ]. ...
doi:10.1002/hbm.10106
pmid:12768531
fatcat:nlbxwmr63vemppxhfqmwd4jluu
Increased Resting-State Functional Connectivity in Obese Adolescents; A Magnetoencephalographic Pilot Study
2008
PLoS ONE
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Obesity is not only associated with metabolic abnormalities, but also with cognitive dysfunction and changes in the central nervous system. The present pilot study was carried out to investigate functional connectivity in obese and non-obese adolescents using magnetoencephalography (MEG). Methodology/Principal Findings: Magnetoencephalographic recordings were performed in 11 obese (mean BMI 38.864.6 kg/m 2 ) and 8 lean (mean BMI 21.061.5 kg/m 2 ) female adolescents (age 12-19 years) during an
doi:10.1371/journal.pone.0002827
pmid:18665257
pmcid:PMC2474698
fatcat:mfy6kh5y5nf2dljynguketj2gy
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... es-closed resting-state condition. From these recordings, the synchronization likelihood (SL), a common method that estimates both linear and non-linear interdependencies between MEG signals, was calculated within and between brain regions, and within standard frequency bands (delta, theta, alpha1, alpha2, beta and gamma). The obese adolescents had increased synchronization in delta (0.5-4 Hz) and beta (13-30 Hz) frequency bands compared to lean controls (P delta total = 0.001; P beta total = 0.002). Conclusions/Significance: This study identified increased resting-state functional connectivity in severe obese adolescents. Considering the importance of functional coupling between brain areas for cognitive functioning, the present findings strengthen the hypothesis that obesity may have a major impact on human brain function. The cause of the observed excessive synchronization is unknown, but might be related to disturbed motivational pathways, the recently demonstrated increase in white matter volume in obese subjects or altered metabolic processes like hyperinsulinemia. The question arises whether the changes in brain structure and communication are a dynamic process due to weight gain and whether these effects are reversible or not.
A Healthy Brain in a Healthy Body: Brain Network Correlates of Physical and Mental Fitness
2014
PLoS ONE
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Citation: Douw L, Nieboer D, van Dijk BW, Stam CJ, Twisk JWR (2014) A Healthy Brain in a Healthy Body: Brain Network Correlates of Physical and Mental Fitness. PLoS ONE 9(2): e88202. ...
It was defined as follows: z w i~k w i m i ð Þ{ k w m i ð Þ s k w m i ð Þ Here, m i is the module containing node i, k w i m i ð Þ is the within module strength of node i (the sum of all weights of the ...
The cost C was defined as {Q w m . ...
doi:10.1371/journal.pone.0088202
pmid:24498438
pmcid:PMC3912221
fatcat:4hnm7rvju5ed3bz4em4vj3vdmi
Integrating cross-frequency and within band functional networks in resting-state MEG: A multi-layer network approach
2016
NeuroImage
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., 2015; Van Mieghem, 2016) . ...
metrics for nodes (Van Mieghem, 2014) . ...
doi:10.1016/j.neuroimage.2016.07.057
pmid:27498371
fatcat:rbs76jefqnev7pltpz6ndqma4i
Resting-State Oscillatory Activity in Children Born Small for Gestational Age: An MEG Study
2013
Frontiers in Human Neuroscience
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M. van Wijk. The authors declare that they have no conflict of interest. ...
doi:10.3389/fnhum.2013.00600
pmid:24068993
pmcid:PMC3781344
fatcat:nvgsreff6vh6fliaootmksav44
Cognitive and Clinical Dysfunction, Altered MEG Resting-State Networks and Thalamic Atrophy in Multiple Sclerosis
2013
PLoS ONE
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Citation: Tewarie P, Schoonheim MM, Stam CJ, van der Meer ML, van Dijk BW, et al. (2013) Cognitive and Clinical Dysfunction, Altered MEG Resting-State Networks and Thalamic Atrophy in Multiple Sclerosis ...
doi:10.1371/journal.pone.0069318
pmid:23935983
pmcid:PMC3729968
fatcat:yor6dvad7rftzfvgbys5isopei
Relation between carotid stiffness, cognitive performance and brain connectivity in a healthy middle-aged population: an observational neurophysiological cohort study with magnetoencephalography
2016
BMJ Open
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To cite: Nieboer D, Douw L, van Dijk BW, et al. ...
Luteijn and Van der Ploeg reported Cronbach's α of the total GIT to be 0.97 and a correlation with the shortened version of 0.94 with the complete test. 28 The shortened version of the GIT was used as ...
described in detail elsewhere. 25 26 During the measurement, the arterial diameter (D), intima-media-thickness (IMT) and distension (ΔD) were quantified by ultrasonography, determined according to the Van ...
doi:10.1136/bmjopen-2016-013441
pmid:27979838
pmcid:PMC5168642
fatcat:2u2htqyh5nd57d5w7wcypy3m6m
Top-down modulation in human visual cortex predicts the stability of a perceptual illusion
2015
Journal of Neurophysiology
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Kloosterman NA, Meindertsma T, Hillebrand A, van Dijk BW, Lamme VA, Donner TH. Top-down modulation in human visual cortex predicts the stability of a perceptual illusion. ...
Cohen, Simon van Gaal, Tomas Knapen, Anouk van Loon, Sander Nieuwenhuis, Jan Brascamp, and all members of the Donner laboratory for comments on the manuscript.
GRANTS ...
reports, which can reflect the content of the report (Aston-Jones and Cohen 2005; de Gee et al. 2014; Einhauser et al. 2008; Hupe et al. 2009; Parikh et al. 2007 ; also Kloosterman NA, Meindertsma T, van ...
doi:10.1152/jn.00338.2014
pmid:25411458
pmcid:PMC4329440
fatcat:yry73vrz6nhwlb5yce2pmidapa
Long-term effects of cranial irradiation and intrathecal chemotherapy in treatment of childhood leukemia: a MEG study of power spectrum and correlated cognitive dysfunction
2012
BMC Neurology
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Prophylaxis to prevent relapses in the central nervous system after childhood acute lymphoblastic leukemia (ALL) used to consist of both intrathecal chemotherapy (CT) and cranial irradiation (CRT). CRT was mostly abolished in the eighties because of its neurotoxicity, and replaced with more intensive intrathecal CT. In this study, a group of survivors treated with CRT before 1983 and another group treated without CRT thereafter are investigated 20-25 years later, giving a much stronger
doi:10.1186/1471-2377-12-84
pmid:22928913
pmcid:PMC3517522
fatcat:evybqkygongezful7iytmoj6ei
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... ve on long-term quality of life than previous studies. The outcomes will help to better understand these groups' current needs and will aid in anticipating late effects of prophylactic CRT that is currently applied for other diseases. This study evaluates oscillatory neuronal activity in these long-term survivors. Power spectrum deviations are hypothesized to correlate with cognitive dysfunction. Methods: Resting state eyes-closed magnetoencephalography (MEG) recordings were obtained from 14 ALL survivors treated with CT + CRT, 18 treated with CT alone and 35 controls. Relative spectral power was calculated in the δ, θ, α1, α2, β and γ frequency bands. The Amsterdam Neuropsychological Tasks (ANT) program was used to assess cognition in the executive functions domain. MEG data and ANT scores were correlated. Results: In the CT + CRT group, relative θ power was slightly increased (p = 0.069) and α2 power was significantly decreased (p = 0.006). The CT + CRT group performed worse on various cognitive tests. A deficiency in visuomotor accuracy, especially of the right hand, could be clearly associated with the deviating regional θ and α2 powers (0.471 < r < 0.697). A significant association between decreased regional α2 power and less attentional fluctuations was found for CT + CRT patients as well as controls (0.078 < r < 0.666). Patients treated with CT alone displayed a power spectrum similar to controls, except for a significantly increased level of left frontal α2 power (p = 0.030). Conclusions: The tendency towards global slowing of brain oscillatory activity, together with the fact that dementia has been reported as a late effect of CRT and the neuropsychological deficiencies currently present, suggest that the irradiated brain might be aging faster and could be at risk for early-onset dementia. The CT group showed no signs of early aging.
Magnetoencephalography as a Putative Biomarker for Alzheimer's Disease
2011
International Journal of Alzheimer's Disease
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However, "(w)hether one of these measures or a combination of them is more sensitive than the other, and whether quantitative values provide more information than a dichotomous rating are yet to be determined ...
doi:10.4061/2011/280289
pmid:21547221
pmcid:PMC3087473
fatcat:bids2l5aqrgn3izh6gab2pgbwu
Disturbed functional brain networks and neurocognitive function in low-grade glioma patients: a graph theoretical analysis of resting-state MEG
2009
Nonlinear Biomedical Physics
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Manshanden, G. de Vos for technical assistance, Els van Deventer for providing us with the relevant literature, and Dr L.J.A. ...
doi:10.1186/1753-4631-3-9
pmid:19698149
pmcid:PMC2745411
fatcat:5h7jpcl6eva2xd3swrc3vwebji
Reproducibility of hippocampal atrophy rates measured with manual, FreeSurfer, AdaBoost, FSL/FIRST and the MAPS-HBSI methods in Alzheimer's disease
2016
Psychiatry Research : Neuroimaging
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Cover, KS., van Schijndel, RA., Popescu, V., van Dijk, BW., Redolfi, A., Knol, KL., Frisoni, GB., Barkhof, F., Vrenken H., 2014 . ...
de Jong, L.W., van der Hiele, K., Veer, I.M., Houwing, J.J., Westendorp, R.G.J., Bollen, E.L.E.M., de Bruin, P.W., Middelkoop, H.A.M., van Buchem, M.A., van der Grond, J., 2008. ...
doi:10.1016/j.pscychresns.2016.04.006
pmid:27179313
fatcat:czuhtwha2rb7doxpmvy72ggm5e
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