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Relevant bibliographies by topics / Aperiodic activity

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Academic literature on the topic 'Aperiodic activity'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Aperiodic activity"

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Freeman, W. J. "A proposed name for aperiodic brain activity: stochastic chaos." Neural Networks 13, no. 1 (January 2000): 11–13. http://dx.doi.org/10.1016/s0893-6080(99)00093-3.

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Smith, Myron A. "Recent Spectroscopic Evidence for Aperiodic Activity in Classical Be Stars." International Astronomical Union Colloquium 175 (2000): 292–303. http://dx.doi.org/10.1017/s0252921100056049.

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AbstractThis review focuses on aperiodic line profile activity in several Be stars, ignoring attributes of pulsations probably occurring in any of the stars studied. Herein, I discuss spectroscopic evidence of heating (and cooling) of regions of Be star atmospheres, of line profile transients called dimples and high velocity absorptions. These features will be interpreted in terms of mass ejections (not necessarily permanent). Some of these events are violent and spasmodic, some are ordered and quasisteady, and some are associated with downflows. I close with new evidence for time-varying, corotating clouds suspended over a few Be stars.

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Varner, K. J., S. M. Barman, and G. L. Gebber. "Cat diencephalic neurons with sympathetic nerve-related activity." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 254, no. 2 (February 1, 1988): R257—R267. http://dx.doi.org/10.1152/ajpregu.1988.254.2.r257.

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In a companion paper, we demonstrated that hypothalamic or medial thalamic lesions attenuate the reduction in inferior cardiac postganglionic sympathetic nerve discharge (SND) produced by decerebration in the anesthetized cat [Huang et al., Am. J. Physiol. 254 (Regulatory Integrative Comp. Physiol. 23): R249-R256, 1988]. This raised the possibility that these diencephalic regions contain the cell bodies of neurons that contribute to SND. The current study tested this possibility in cats anesthetized with alpha-chloralose. Spike-triggered averaging of inferior cardiac SND revealed the existence of two types of hypothalamic and medial thalamic neurons with sympathetic nerve-related activity. Recordings were made from the soma-dendritic region of these neurons, since an inflection often appeared on the rising phase of the unit action potential. The activity of type 1 neurons was synchronized to an aperiodic spikelike event in SND, whereas that of type 2 neurons was synchronized to a 2- to 6-Hz rhythmic component. Some of the type 2 neurons but none of the type 1 neurons had cardiac-related activity. Microstimulation at type 1 and type 2 unit recording sites increased SND. Our results are consistent with the possibility that hypothalamic and medial thalamic neurons contribute to the rhythmic and aperiodic components of SND in the anesthetized cat.

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Donoghue, Thomas, Julio Dominguez, and Bradley Voytek. "Electrophysiological Frequency Band Ratio Measures Conflate Periodic and Aperiodic Neural Activity." eneuro 7, no. 6 (September 25, 2020): ENEURO.0192–20.2020. http://dx.doi.org/10.1523/eneuro.0192-20.2020.

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Ishizuka, Kentaro, Tomohiro Nakatani, Masakiyo Fujimoto, and Noboru Miyazaki. "Noise robust voice activity detection based on periodic to aperiodic component ratio." Speech Communication 52, no. 1 (January 2010): 41–60. http://dx.doi.org/10.1016/j.specom.2009.08.003.

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Ramsay, Ian, Peter Lynn, Erik Lee, Brandon Schermitzler, David Leipold, and Scott Sponheim. "Disturbances in Aperiodic Neural Activity During Resting State in Patients With Schizophrenia." Biological Psychiatry 89, no. 9 (May 2021): S254—S255. http://dx.doi.org/10.1016/j.biopsych.2021.02.637.

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Katz, J. I. "Testing models of periodically modulated FRB activity." Monthly Notices of the Royal Astronomical Society 502, no. 3 (February 11, 2021): 4664–68. http://dx.doi.org/10.1093/mnras/stab399.

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ABSTRACT The activity of the repeating FRB 20180916B is periodically modulated with a period of 16.3 d, and FRB 121102 may be similarly modulated with a period of about 160 d. In some models of this modulation, the period derivative is insensitive to the uncertain parameters; these models can be tested by measurement of or bounds on the derivative. In other models, values of the uncertain parameters can be constrained. Periodic modulation of aperiodic bursting activity may result from emission by a narrow beam wandering within a cone or funnel along the axis of a precessing disc, such as the accretion discs in X-ray binaries. The production of FRB 200428 by a neutron star that is neither accreting nor in a binary then shows universality: coherent emission occurring in a wide range of circumstances.

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Sheeba, V., M. Chandrashekaran, Amitabh Joshi, and Vijay Sharma. "Locomotor activity rhythm in Drosophila melanogaster after 600 generations in an aperiodic environment." Naturwissenschaften 89, no. 11 (November 1, 2002): 512–14. http://dx.doi.org/10.1007/s00114-002-0360-9.

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Singer, Annabelle C., Giovanni Talei Franzesi, Suhasa B. Kodandaramaiah, Francisco J. Flores, Jeremy D. Cohen, Albert K. Lee, Christoph Borgers, Craig R. Forest, Nancy J. Kopell, and Edward S. Boyden. "Mesoscale-duration activated states gate spiking in response to fast rises in membrane voltage in the awake brain." Journal of Neurophysiology 118, no. 2 (August 1, 2017): 1270–91. http://dx.doi.org/10.1152/jn.00116.2017.

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We analyzed subthreshold activity preceding spikes in hippocampus and barrel cortex of awake mice. Aperiodic voltage ramps extending over tens to hundreds of milliseconds consistently precede and facilitate spikes, in a manner dependent on both their amplitude and their duration. These voltage ramps represent a “mesoscale” activated state that gates spike production in vivo.

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Silbert, B. S., E. Koumoundouros, M. J. Davies, and K. D. Cronin. "The use of Aperiodic Analysis of the EEG during Carotid Artery Surgery." Anaesthesia and Intensive Care 17, no. 1 (February 1989): 16–23. http://dx.doi.org/10.1177/0310057x8901700105.

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A new processed EEG machine, the Lifescan, ® which uses aperiodic analysis, was used to monitor cerebral activity prospectively in twenty-one patients undergoing carotid artery surgery under general anaesthesia. The machine was easy to apply, use and read. Volatile agents caused a bilateral decrease in high frequency activity. Unilateral changes consistent with cerebral ischaemia at the time of carotid cross-clamping were also seen. One such prolonged change was not associated with neurological deficit. A further patient awoke with neurological deficit without displaying Lifescan® evidence of ischaemia. The machine requires further assessment.

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Dissertations / Theses on the topic "Aperiodic activity"

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Afzal, Muhammad Furqan. "Robust Encoding of Aperiodic Spatiotemporal Activity Patterns in Recurrent Neural Networks." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458900169.

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Kosciessa, Julian Q. "Measurement and relevance of rhythmic and aperiodic human brain dynamics." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/22040.

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Menschliche Hirnsignale von der Kopfhaut bieten einen Einblick in die neuronalen Prozesse, denen Wahrnehmung, Denken und Verhalten zugrunde liegen. Rhythmen, die historisch den Grundstein für die Erforschung großflächiger Hirnsignale legten, sind ein häufiges Zeichen neuronaler Koordination, und damit von weitem Interesse für die kognitiven, systemischen und komputationalen Neurowissenschaften. Typischen Messungen von Rhythmizität fehlt es jedoch an Details, z. B. wann und wie lange Rhythmen auftreten. Darüber hinaus weisen neuronale Zeitreihen zahlreiche dynamische Muster auf, von denen nur einige rhythmisch erscheinen. Obwohl aperiodischen Beiträgen traditionell der Status irrelevanten „Rauschens“ zugeschrieben wird, attestieren neuere Erkenntnisse ihnen ebenfalls eine Signalrolle in Bezug auf latente Hirndynamik. Diese kumulative Dissertation fasst Projekte zusammen, die darauf abzielen, rhythmische und aperiodische Beiträge zum menschlichen Elektroenzephalogramm (EEG) methodisch zu dissoziieren, und ihre Relevanz für die flexible Wahrnehmung zu untersuchen. Projekt 1 ermittelt insbesondere die Notwendigkeit und Durchführbarkeit der Trennung rhythmischer von aperiodischer Aktivität in kontinuierlichen Signalen. Projekt 2 kehrt diese Perspektive um und prüft Multiscale Entropy als Index für die Unregelmäßigkeit von Zeitreihen. Diese Arbeit weist auf methodische Probleme in der klassischen Messung zeitlicher Unregelmäßigkeit hin, und schlägt Lösungen für zukünftige Anwendungen vor. Abschließend untersucht Projekt 3 die neurokognitive Relevanz rhythmischer und aperiodischer Zustände. Anhand eines parallelen multimodalen EEG-fMRT-Designs mit gleichzeitiger Pupillenmessung liefert dieses Projekt erste Hinweise dafür, dass erhöhte kognitive Anforderungen Hirnsignale von einem rhythmischen zu einem unregelmäßigen Regime verschieben und impliziert gleichzeitige Neuromodulation und thalamische Aktivierung in diesem Regimewechsel.
Non-invasive signals recorded from the human scalp provide a window on the neural dynamics that shape perception, cognition and action. Historically motivating the assessment of large-scale network dynamics, rhythms are a ubiquitous sign of neural coordination, and a major signal of interest in the cognitive, systems, and computational neurosciences. However, typical descriptions of rhythmicity lack detail, e.g., failing to indicate when and for how long rhythms occur. Moreover, neural times series exhibit a wealth of dynamic patterns, only some of which appear rhythmic. While aperiodic contributions are traditionally relegated to the status of irrelevant ‘noise’, they may be informative of latent processing regimes in their own right. This cumulative dissertation summarizes and discusses work that (a) aims to methodologically dissociate rhythmic and aperiodic contributions to human electroencephalogram (EEG) signals, and (b) probes their relevance for flexible cognition. Specifically, Project 1 highlights the necessity, feasibility and limitations of dissociating rhythmic from aperiodic activity at the single-trial level. Project 2 inverts this perspective, and examines the utility of multi-scale entropy as an index for the irregularity of brain dynamics, with a focus on the relation to rhythmic and aperiodic descriptions. By highlighting prior biases and proposing solutions, this work indicates future directions for measurements of temporal irregularity. Finally, Project 3 examines the neurocognitive relevance of rhythmic and aperiodic regimes with regard to the neurophysiological context in which they may be engaged. Using a parallel multi-modal EEG-fMRI design with concurrent pupillometry, this project provides initial evidence that elevated demands shift cortical dynamics from a rhythmic to an irregular regime; and implicates concurrent phasic neuromodulation and subcortical thalamic engagement in these regime shifts.

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Book chapters on the topic "Aperiodic activity"

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Marinaro, Maria, and Silvia Scarpetta. "Noise Induces Spontaneous Synchronous Aperiodic Activity in EI Neural Networks." In Artificial Neural Networks — ICANN 2002, 39–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-46084-5_7.

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Conference papers on the topic "Aperiodic activity"

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Donoghue, Thomas, Richard Gao, Leonhard Waschke, and Bradley Voytek. "A Simulation-Based Comparison of Methods for Analyzing Aperiodic Neural Activity." In 2019 Conference on Cognitive Computational Neuroscience. Brentwood, Tennessee, USA: Cognitive Computational Neuroscience, 2019. http://dx.doi.org/10.32470/ccn.2019.1394-0.

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Afzal, M. Furqan, and Ali A. Minai. "Reliable storage and recall of aperiodic spatiotemporal activity patterns using scaffolded attractors." In 2016 International Joint Conference on Neural Networks (IJCNN). IEEE, 2016. http://dx.doi.org/10.1109/ijcnn.2016.7727451.

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Waschke, Leonhard, Thomas Donoghue, Sydney Smith, Bradley Voytek, and Jonas Obleser. "Aperiodic EEG activity tracks 1/f stimulus characteristics and the allocation of cognitive resources." In 2019 Conference on Cognitive Computational Neuroscience. Brentwood, Tennessee, USA: Cognitive Computational Neuroscience, 2019. http://dx.doi.org/10.32470/ccn.2019.1111-0.

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Ishizuka, Kentaro, Tomohiro Nakatani, Masakiyo Fujimoto, and Noboru Miyazaki. "Noise robust front-end processing with voice activity detection based on periodic to aperiodic component ratio." In Interspeech 2007. ISCA: ISCA, 2007. http://dx.doi.org/10.21437/interspeech.2007-93.

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Ruzzene, M., and A. Baz. "Localization and Control of Wave Propagation in Active Periodic Fluid-Loaded Shells." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21739.

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Abstract Periodically placed actuators are used to control the wave propagation and to localize the vibration and sound radiation of fluid-loaded shells. The filtering capabilities of the resulting periodic structure can be actively tuned by modifying the feedback control gain of the actuators thus allowing for controlling the spectral width and location of the stop and pass bands as well as introducing controlled aperiodicity in the structure. A finite element model is developed to study the fundamental phenomena governing the coupling between the shell, actuators and the fluid domain surrounding the shell. The geometry of the shell and the fluid domain allows for the formulation of a harmonic-based model with uncoupled circumferential modes. The model is used to predict the pass and stop frequency bands for different proportional control gains and to evaluate the shell harmonic response and the sound radiation into the surrounding fluid. The obtained results indicate that the location and width of the stop bands as well as the attenuation characteristics of the shell can be modified by proper choice of the proportional control gain. Numerical simulations also demonstrate that the location of the stop bands can be identified from the frequency response function of the shell and from the sound intensity. The tunable characteristics of the proposed active shells allow for the introduction of controlled aperiodicty through proper adjustments of the actuators’ feedback gains. Disorder in periodic structures typically extends the stopbands into adjacent propagation zones and, more importantly, localizes the vibration energy near the excitation source. Both structural response and sound radiation are evaluated for increasing levels of aperiodicity. The results presented demonstrate the effectiveness of the proposed concept as an effective means for controlling the attenuation characteristics of fluid-loaded shells and for confining both vibration and sound radiation near the excitation source. Also, the presented analysis provides an invaluable means for designing fluid-loaded shells, which are quiet over desired frequency bands and where the energy can be spatially confined in well-defined restricted areas.

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