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Evidence that alpha blocking is due to increases in system-level oscillatory damping not neuronal population desynchronisation [article]

David TJ Liley, Suresh D Muthukumaraswamy
2019 bioRxiv   pre-print
We find that the reduction in alpha-band power between eyes-closed and eyes-open states is explicable in terms of an increase in the damping of stochastically perturbed alpha-band relaxation oscillatory  ...  These results not only provide a direct challenge to the dominant view of the role that thalamus and neuronal population de-/synchronisation have in the genesis and modulation of alpha electro-/magnetoencephalographic  ...  The data analysed in this paper was funded by a grant from F Hoffman La Roche Ltd.  ... 
doi:10.1101/729723 fatcat:lmouhs6ivnge7mov3hf23ten5q

Oscillations and the basal ganglia: Motor control and beyond

John-Stuart Brittain, Peter Brown
2014 NeuroImage  
Evidence is accruing from cortical and sub-cortical recordings that these rhythms may be functionally important, although the precise details of their roles remain unclear.  ...  While certain cortical rhythms appear to penetrate the basal ganglia, others are transformed or blocked.  ...  As subpopulations of neurons become correlated, the signal-to-noise ratio of that cluster relative to the population increases.  ... 
doi:10.1016/j.neuroimage.2013.05.084 pmid:23711535 pmcid:PMC4813758 fatcat:s3x3qt5a2fhsxicf42cygxoyse

The physical basis of alpha waves in the electroencephalogram and the origin of the ?Berger effect?

Kuno Kirschfeld
2005 Biological cybernetics  
This finding is usually thought to involve a desynchronisation of activity in different neurons.  ...  If the mechanism is linear -in contrast to nonlinear ones -phases cannot be reset by a stimulus. It is shown that alpha-wave activity in the EEG comprises both linear and nonlinear components.  ...  To isolate alpha waves, signals were band-pass filtered (8-12 Hz, Butterworth Second order).  ... 
doi:10.1007/s00422-005-0547-1 pmid:15739111 fatcat:4wglse6nhfetfldpk7y5bud2oy

Short-Term EEG Spectral Pattern as a Single Event in EEG Phenomenology

Al. A Fingelkurts, An. A Fingelkurts
2010 The Open Neuroimaging Journal  
To support this assumption the following issues are considered in detail: (a) the relations between local EEG short-term spectral pattern of particular type and the actual state of the neurons in underlying  ...  A relatively new promising area in the study of EEG is based on reducing the signal to elementary short-term spectra of various types in accordance with the number of types of EEG stationary segments instead  ...  ACKNOWLEDGEMENTS The authors wish to thank V.A. Ermolaev, R. Ivashko and C. Neves for technical and IT support at different stages of the research program. Spacial thanks goes to Dr. P.  ... 
doi:10.2174/1874440001004010130 pmid:21379390 pmcid:PMC3043273 fatcat:b4lica6anfbnhnerghkhmm2bne

Post-stimulus fMRI and EEG responses: Evidence for a neuronal origin hypothesised to be inhibitory

K.J. Mullinger, M.T. Cherukara, R.B. Buxton, S.T. Francis, S.D. Mayhew
2017 NeuroImage  
However, the debate surrounding whether the origin of this response phase is neuronal or vascular, and whether it provides functionally relevant information, that is additional to what is contained in  ...  The post-stimulus BOLD and CBF signal amplitudes in both contralateral and ipsilateral visual cortex depended on the post-stimulus power of the occipital 8-13Hz (alpha) EEG neuronal activity, such that  ...  It is important to note that we do not claim that the post-stimulus EEG-fMRI coupling is entirely driven by alpha frequency activity.  ... 
doi:10.1016/j.neuroimage.2017.06.020 pmid:28610902 pmcid:PMC6475192 fatcat:ymvk6eu4njgd5ewaxwrykfh2aq

Toward a quantitative description of large-scale neocortical dynamic function and EEG

Paul L. Nunez
2000 Behavioral and Brain Sciences  
However, the assumption that gamma band coherence in particular is necessary to achieve binding between distinct populations of neurons is not well justified.  ...  The increased neuromodulatory levels result in a decoupling of the corticocortical fibres that sustain the mu regional resonances, leading to mu rhythm desynchronisation.  ...  It aims to compress the effective number of degrees of freedom in complex systems to a few "order parameters" (actually variables) that adequately approximate system dynamics at large scales.  ... 
doi:10.1017/s0140525x00003253 fatcat:qgg5rqiyj5h45aamfootetmxf4

Toward a quantitative description of large-scale neocortical dynamic function and EEG

P L Nunez
2000 Behavioral and Brain Sciences  
A local/global dynamic theory that is consistent with EEG data and the proposed conceptual framework is outlined.  ...  Global frequencies are identical in all cortical regions, but most states involve dynamic interactions between local networks and the global system.  ...  However, the assumption that gamma band coherence in particular is necessary to achieve binding between distinct populations of neurons is not well justified.  ... 
pmid:11301576 fatcat:cmcfenrrdzfnbndia5kgtnsiqu

28th Annual Computational Neuroscience Meeting: CNS*2019

2019 BMC Neuroscience  
supercritical Hopf bifurcation, that in presence of the theta forcing is excited, giving rise to gamma oscillations super imposed on the theta rhythm, somehow similarly to what previously found in [8].  ...  The first one consisted of using the neuron oscillations to drive the robot directly, for example moving the legs when a specific neuron fires.  ...  The shift in the most weakly damped distribution mode to more heavily damped one resulted in a direct reduction in the alpha peak.  ... 
doi:10.1186/s12868-019-0538-0 fatcat:3pt5qvsh45awzbpwhqwbzrg4su

25th Annual Computational Neuroscience Meeting: CNS-2016

Tatyana O. Sharpee, Alain Destexhe, Mitsuo Kawato, Vladislav Sekulić, Frances K. Skinner, Daniel K. Wójcik, Chaitanya Chintaluri, Dorottya Cserpán, Zoltán Somogyvári, Jae Kyoung Kim, Zachary P. Kilpatrick, Matthew R. Bennett (+597 others)
2016 BMC Neuroscience  
I will discuss theoretical results that point to functional advantages of splitting neural populations into subtypes, both in feedforward and recurrent networks.  ...  Part of this complexity is related to the number of different cell types that work together to encode stimuli.  ...  The funders had no role in study design, data collection and analysis, the decision to publish, or the preparation of the manuscript.  ... 
doi:10.1186/s12868-016-0283-6 pmid:27534393 pmcid:PMC5001212 fatcat:bt45etzj2bbolfcxlxo7hlv6ju

Mathematical Frameworks for Oscillatory Network Dynamics in Neuroscience

Peter Ashwin, Stephen Coombes, Rachel Nicks
2016 Journal of Mathematical Neuroscience  
In this review we present a set of mathematical tools that are suitable for addressing the dynamics of oscillatory neural networks, broadening from a standard phase oscillator perspective to provide a  ...  However, there are many instances when this theory is expected to break down, say in the presence of strong coupling, or must be carefully interpreted, as in the presence of stochastic forcing.  ...  Acknowledgements We would like to thank many people for commenting on draft versions of the manuscript, in particular Chris Bick, Áine Byrne, Kurtis Gibson, Diego Pázo, Mason Porter and Kyle Wedgwood.  ... 
doi:10.1186/s13408-015-0033-6 pmid:26739133 pmcid:PMC4703605 fatcat:m2sisazz2ndqvb76b23kivib7m

Frontal-midline theta from the perspective of hippocampal "theta"

Damon J. Mitchell, Neil McNaughton, Danny Flanagan, Ian J. Kirk
2008 Progress in Neurobiology  
Indeed, and more generally, it has been argued that the function of theta activity (in populations of neurons) is to integrate or coordinate activity across a distributed system that may have elements  ...  From rhythm to function Rhythmic oscillation is likely to occur in excitatory neural circuits that are recursively connected whenever these are not highly damped.  ... 
doi:10.1016/j.pneurobio.2008.09.005 pmid:18824212 fatcat:exhdoec37vdgnmbmrgwnkgzrey

Abstracts [chapter]

Charles W. Shilling, Margaret F. Werts
1973 Underwater Medicine and Related Sciences  
During this miSSion, a six-man crew was sustained for a little more than 30 days by a system that was quite umque In many respects.  ...  Assessing the life support systems of the Ben Franklin submarine.  ...  Lumbar pam and a full Meniere syndrome followed within four hours, and the patient was placed in a hyperbariC chamber and recompressed to 4.4 ata for 40 mmutes.  ... 
doi:10.1007/978-1-4684-8500-4_1 fatcat:nhq2pypck5bw7jmbyrgdz5z57m

The Effect of Input from the Cerebellar Nuclei on Activity in Thalamocortical Networks [article]

Julia Goncharenko, UH Research Archive
I have also shown that a three-fold increase in the inhibitory [...]  ...  The cerebellum is a prominent brain structure that contains more than half of all neurons, in the brain, which are densely packed and make up 15% of the total brain mass (Andersen et al., 1992).  ...  Unfortunately, there is no evidence of any neuronal population terminating GSWDs earlier.  ... 
doi:10.18745/th.25325 fatcat:l7tco3fyibdondymqwhabl3hu4

Waves and Words: Oscillatory activity and language processing

Dietmar Roehm, Matthias HD Dr. Schlesewsky, Germanistische Sprachwissenschaft
It is argued that this new method, which supplements ERP measures with corresponding frequency-based analyses, not only allows for a differentiation of ERP components on the basis of activity in distinct  ...  a first interpretative categorisation of the N400 effect with respect to its underlying neuronal processing dynamics; and (3) that frequency-based analys [...]  ...  mechanisms are mediated by the reticular activating system; however, arousal is related to alpha-blocking which again is reflected in a general alpha desynchronisation measured for example by event-related  ... 
doi:10.17192/z2005.0110 fatcat:ivpyifpy7narjkz3nup42mr7le

Ongoing temporal dynamics of broadband EEG during movement intention for BCI

Maitreyee Wairagkar
There was an increase in the temporal dependencies in the EEG leading to slower decay of autocorrelation during the movement and significant increase in the LRTC (p<0.05).  ...  Hence, to develop effective motor-based non-invasive BCIs, it is essential to understand the mechanisms of neural processes involved in motor command generation in electroencephalography (EEG).  ...  can block or desynchronise brain activity in different frequency bands such as alpha band [26].  ... 
doi:10.48683/1926.00085453 fatcat:eakoy3rkcfgtrlmuzfn54wqorm
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